JOHN M WALLMARK M.D.
NPI 1689755365
Internal Medicine - Hematology & Oncology in Rockville, MD

Q: What is John Wallmark's NPI number?

The NPI number for John Wallmark is 1689755365. It was assigned to this individual provider in the NPPES registry on October 18, 2006.

Q: What is John Wallmark's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Q: When was this NPI record last updated?

The NPPES record for John Wallmark was last updated on August 1, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since October 18, 2006PECOS EnrolledAccepts Medicare Assignment

94.99/100

CMS Quality Rating

9707 MEDICAL CENTER DR, SUITE 300, ROCKVILLE, MD 20850(301) 424-6231(301) 294-4648 Get Directions Write a Review

NPPES record last updated: August 1, 2012. Verified against the NPPES registry weekly; last sync: October 18, 2026.

On this page

About John M Wallmark M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

JOHN M WALLMARK M.D. (NPI 1689755365) is an individual hematology & oncology provider in Rockville, Maryland, licensed in Maryland (D0053177) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Suburban Hospital, and is a graduate of Hahnemann University College Of Medicine (1992).

NPPES Registry Identity

NPI1689755365

Entity TypeIndividualMale

Primary Taxonomy207RH0003X

Provider Legal NameJOHN M WALLMARKCredential: M.D.

Location Address9707 MEDICAL CENTER DR, SUITE 300Rockville, MD 20850-3348

Mailing Address9707 Medical Center Dr, Suite 300Rockville, MD 20850-3348 · (301) 424-6231 · Fax (301) 294-4648

Phone(301) 424-6231

Fax(301) 294-4648

Sole ProprietorNo

Medical School CMSHahnemann University College Of MedicineGraduated 1992

Enumeration DateOctober 18, 2006

Last NPPES UpdateAugust 1, 2012

✔ NPI 1689755365 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RH0003X

License✔ Licensed in MD · D0053177

Definition

An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.

9707 MEDICAL CENTER DR, Rockville, MD 20850

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Other Identifiers 3

Medicare ID-Type Unspecified001283A96

Medicaid40453510MD

Medicare UPING72401

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

John M Wallmark M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5799868592

PECOS Enrollment IDI20100917000692, I20190311000136

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show John Wallmark reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Maryland Oncology Hematology, P.A.

17 mi

Multi-Specialty

7350 VAN DUSEN RD STE 370
Laurel, MD 20707

Reassigned Medicare billing, District of Columbia and Maryland enrollments
Medicare enrollment name: Maryland Oncology Hematology PA
Also billed through NPI 1396710703 (Maryland)
74 clinicians in this Medicare group

NPI 1821271032 (301) 470-1001

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 63

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Injection, darbepoetin alfa, 1 microgram (non-esrd use) J0881

Darbepoetin alfa injection is a medication used to treat anemia (low red blood cell count) often caused by chronic kidney disease or chemotherapy. It works by stimulating your body to produce more red blood cells, helping to increase your energy and well-being.

23,500 services32 patients

Injection, pembrolizumab, 1 mg J9271

Pembrolizumab is a medication given via injection to help your body's immune system fight certain types of cancer. It's typically administered in a hospital or clinic by a healthcare professional.

11,600 services21 patients

Injection, ferric carboxymaltose, 1 mg J1439

Ferric carboxymaltose is an iron supplement injection. It's given when your body needs more iron than you can consume through diet, like in anemia. The injection is administered by a healthcare professional into a vein.

11,250 services13 patients

Injection, paclitaxel, 1 mg J9267

Paclitaxel is a medication administered via injection to treat various types of cancer. It works by inhibiting cell division, thus preventing cancer cells from growing and multiplying. Each dose is tailored to the patient's body size.

11,156 services16 patients

Injection, daratumumab, 10 mg and hyaluronidase-fihj J9144

Daratumumab and hyaluronidase-fihj is an injection administered to treat certain types of blood cancer. The medication works by targeting and killing specific cancer cells. It's often given under the skin to reduce side effects and improve patient comfort.

10,440 services20 patients

Injection, azacitidine, 1 mg J9025

Azacitidine is a medication administered via injection to treat certain types of blood or bone marrow cancer. This drug works by slowing or stopping the growth of cancer cells. It's typically given in a clinic or hospital setting by a healthcare professional.

10,300 services13 patients

Injection, filgrastim-aafi, biosimilar, (nivestym), 1 microgram Q5110

Filgrastim-aafi (Nivestym) is a biosimilar injection used to stimulate the growth of white blood cells, which help the body fight off infections. It's often given to patients with low white blood cell counts due to cancer treatments or other conditions.

8,340 services12 patients

Injection, denosumab, 1 mg J0897

Denosumab is a medication given via injection to strengthen your bones. It works by slowing down the cells that break down bone, improving bone density and reducing the risk of fractures. It's often used for osteoporosis treatment.

7,980 services43 patients

Injection, aprepitant, 1 mg J0185

Aprepitant injection is a medication used to prevent nausea and vomiting caused by chemotherapy. It works by blocking certain substances in the brain that trigger these symptoms. The dosage is based on your medical condition and response to treatment.

7,540 services21 patients

Injection, immune globulin, (octagam), intravenous, non-lyophilized (e.g., liquid), 500 mg J1568

This procedure involves an intravenous injection of Octagam, a liquid immune globulin. It is a blood product that helps your body fight off infections. It's given through a vein (IV) and each dose contains 500 mg of the medication.

2,350 services13 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count 85025

A Complete Blood Cell Count is a common test that measures various components of the blood, including red cells (carry oxygen), white cells (fight infection), and platelets (help blood clot). An automated test ensures accuracy. The differential count provides detailed information about white cell types.

2,168 services465 patients

Blood test, comprehensive group of blood chemicals 80053

A comprehensive group of blood chemicals test, also known as a comprehensive metabolic panel, is a blood test that measures your sugar level, electrolyte and fluid balance, kidney function, and liver function. This helps to check your body's overall health.

1,945 services451 patients

Injection, ferric derisomaltose, 10 mg J1437

Ferric derisomaltose is an iron replacement product. It's given as an injection to treat iron deficiency anemia, a condition where the body lacks enough iron. The injection helps increase iron in your body to healthy levels.

1,900 services19 patients

Injection, dexamethasone sodium phosphate, 1 mg J1100

Dexamethasone sodium phosphate is a medication given via injection. It is a type of steroid that helps reduce inflammation and immune responses. It can be used to treat a variety of conditions, such as allergies, skin conditions, arthritis, and more.

1,838 services58 patients

Injection, granisetron hydrochloride, 100 mcg J1626

Granisetron hydrochloride is an anti-nausea medication given by injection. It helps prevent nausea and vomiting often caused by cancer treatments like chemotherapy. Its dosage is measured in micrograms (mcg).

1,430 services37 patients

Injection, fulvestrant, 25 mg J9395

Fulvestrant is an injectable medication used to manage certain types of conditions. It works by blocking the effect of a natural substance in your body. The 25 mg dosage refers to the amount of active substance in each injection.

1,180 services18 patients

Injection, palonosetron hcl, 25 mcg J2469

Palonosetron HCL is an injection used to prevent nausea and vomiting caused by chemotherapy. It works by blocking a natural substance (serotonin) in the body that can cause vomiting. This helps improve your comfort during cancer treatment.

900 services32 patients

Gammaglobulin (immune system protein) measurement 82784

Gammaglobulin measurement is a blood test that checks the levels of certain proteins (gammaglobulins) that the body uses to fight infections. High or low levels can indicate various health conditions. It's a simple, quick procedure with minimal discomfort.

894 services116 patients

Flow cytometry technique for dna or cell analysis, each additional marker 88185

Flow cytometry is a technique that helps analyze the physical and chemical characteristics of cells or particles. When an additional marker is used, it aids in identifying specific cell types or stages of disease. This helps in precise diagnosis and treatment planning.

884 services24 patients

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

872 services457 patients

Injection, carboplatin, 50 mg J9045

Carboplatin is a chemotherapy drug used to treat various types of cancer by slowing or stopping the growth of cancer cells. The 50 mg injection is administered into a vein by a healthcare professional. Side effects may occur.

486 services22 patients

Injection of additional new drug or substance into vein 96375

This procedure involves introducing a new medication or substance into your bloodstream via a vein. It's typically done using a small needle. The substance can help treat various conditions or assist in diagnostic procedures. It's generally safe and monitored by professionals.

461 services81 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

408 services280 patients

Injection of drug or substance under skin or into muscle 96372

This procedure involves administering medication directly under the skin or into a muscle. A small needle is used to inject the drug, allowing it to be absorbed quickly into the bloodstream. It's a common method for delivering a variety of medications.

406 services137 patients

Ferritin (blood protein) level 82728

A Ferritin level test measures the amount of ferritin, a protein that stores iron, in your blood. It helps determine how much iron your body is storing. If levels are low, it may indicate iron deficiency, while high levels could signify conditions like iron overload.

369 services147 patients

Administration of chemotherapy into vein, 1 hour or less 96413

Chemotherapy is a treatment that uses drugs to destroy cancer cells. When administered into a vein, it's often through an IV. This procedure usually lasts 1 hour or less. You may feel a slight pinch as the needle is inserted, but it's generally painless.

355 services99 patients

Iron level 83540

An iron level test measures the amount of iron in your blood. Iron is crucial for producing hemoglobin, a protein in red blood cells that carries oxygen throughout your body. This test helps identify iron deficiencies or excesses, which can lead to conditions like anemia or hemochromatosis.

347 services145 patients

Iron binding capacity 83550

Iron binding capacity is a blood test that measures how well your body can bind and transport iron. This helps your healthcare provider assess if your body has too little or too much iron, which can indicate certain health conditions.

345 services144 patients

Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less 96367

This procedure involves injecting fluids or medication directly into your vein. It's used for treatment, prevention, or diagnosis. An additional sequential infusion may be given within an hour if needed. This helps to ensure the medicine is distributed effectively in your body.

317 services69 patients

Injection, gemcitabine hydrochloride, not otherwise specified, 200 mg J9201

Gemcitabine hydrochloride is a medication given via injection to treat certain types of cancer. The 200 mg dose is administered by a healthcare professional. The drug works by slowing or stopping the growth of cancer cells in the body. It's important to follow your doctor's instructions while receiving this treatment.

270 services13 patients

Measurement of substance using immunoassay technique 83520

An immunoassay technique is a laboratory method used to detect and measure specific substances in the body. This is done by using antibodies that can recognize and bind to these substances. The results can help in diagnosing and monitoring various health conditions.

243 services90 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

201 services127 patients

Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle 96401

This procedure involves giving anti-cancer drugs, which don't contain hormones, into the muscle or under the skin. These drugs help to stop the growth of cancer cells. The process is usually quick and done by a healthcare professional.

172 services40 patients

Carcinoembryonic antigen (cea) protein level 82378

Carcinoembryonic Antigen (CEA) protein level is a blood test often used in cancer care. It measures the amount of CEA protein in your blood, which can increase in cases of certain types of cancer. It's used to monitor treatment progress and check for cancer recurrence.

152 services30 patients

Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less 96365

This is a procedure where a medical professional inserts a small tube into your vein to deliver medication, nutrients, or fluids directly into your bloodstream. This can be for treatment, prevention, or diagnosis. The process typically takes less than an hour.

148 services79 patients

Immunologic analysis for detection of tumor antigen, quantitative; ca 125 86304

This test checks for CA 125, a protein often found in higher amounts in individuals with certain types of tumors. It involves analyzing a blood sample in a lab. It's a quantitative test, meaning it measures the level of CA 125 in your blood.

138 services17 patients

Administration of additional new drug or substance into vein, 1 hour or less 96417

This procedure involves introducing a new drug or substance into your vein, typically via an IV drip. It lasts for an hour or less. This method allows the substance to quickly reach your bloodstream, ensuring rapid and effective treatment.

129 services39 patients

Injection, diphenhydramine hcl, up to 50 mg J1200

Diphenhydramine HCL injection is a medicine given to alleviate symptoms of allergies, colds, or hay fever. It can also help with motion sickness and certain symptoms of Parkinson's disease. Up to 50 mg may be administered depending on your condition.

121 services40 patients

Immunologic analysis for detection of tumor antigen, quantitative; ca 15-3 86300

This is a blood test that measures the level of CA 15-3, a protein often higher in individuals with certain types of cancer. It helps monitor response to treatment and check for cancer recurrence. It's not a standalone diagnostic test but used alongside other evaluations.

118 services16 patients

Injection, zoledronic acid, 1 mg J3489

Zoledronic acid is a medication given via injection to strengthen bones. It's often used in patients with osteoporosis or certain types of cancer. The injection helps reduce the risk of fractures and other bone complications.

116 services20 patients

Administration of hormonal anti-neoplastic chemotherapy under skin or into muscle 96402

This procedure involves the injection of hormone-based anti-cancer drugs under the skin or into a muscle. These medications help to slow down or stop the growth of certain types of cancer cells. The process is usually quick and can be performed in a clinic or hospital.

112 services31 patients

Unclassified drugs J3490

Unclassified drugs are medications that don't fit into an existing category or class due to their unique properties or uses. They may be used for various conditions and their effects may differ widely. Always ask your healthcare provider for more information about these drugs.

101 services37 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233

Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.

100 services54 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

92 services76 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

90 services90 patients

Lactate dehydrogenase (enzyme) level 83615

A Lactate Dehydrogenase level test measures the amount of this enzyme in your body. It's often done when tissue damage is suspected, as high levels can indicate issues like heart disease, lung disease, liver disease, or blood disorders. This test helps in diagnosing and monitoring these conditions.

84 services47 patients

Administration of chemotherapy into vein, each additional hour 96415

Chemotherapy is a treatment method that uses drugs to destroy cancer cells. The drugs are administered into a vein, usually in the arm. Each additional hour of chemotherapy allows for more of the medication to enter your bloodstream to fight against the cancer cells.

78 services25 patients

Infusion into a vein for hydration, each additional hour 96361

This procedure involves delivering fluids directly into your vein to keep your body hydrated. It is typically done when oral hydration is insufficient. Each additional hour means more fluid is infused to ensure adequate hydration.

77 services13 patients

Infusion into a vein for therapy, prevention, or diagnosis, each additional hour 96366

This procedure involves delivering medication, fluids, or nutrients directly into your vein. This is done to treat, prevent, or diagnose various conditions. Each additional hour refers to the extended time you may need to receive these substances for optimal results.

75 services18 patients

Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg J3420

This is a procedure where a small dose of Vitamin B-12, also known as Cyanocobalamin, is injected into your body. This vitamin is essential for nerve function and the production of red blood cells. It's often used to treat vitamin B-12 deficiency.

75 services21 patients

Manual urinalysis test with examination using microscope, non-automated 81000

A manual urinalysis test involves studying a urine sample under a microscope. This non-automated method helps identify any abnormal substances present. It's a useful tool for detecting potential health concerns early. The process is simple and non-invasive.

59 services21 patients

Infusion, normal saline solution , 1000 cc J7030

An infusion of normal saline solution, 1000 cc, is a common medical procedure. It involves introducing a saltwater solution into your bloodstream via an intravenous (IV) line. This helps to hydrate your body, correct electrolyte imbalances, and deliver medications if needed.

47 services32 patients

Haptoglobin (serum protein) level 83010

The Haptoglobin level test measures the amount of haptoglobin, a protein made by the liver, in your blood. This test is often used to check for conditions that cause the breakdown of red blood cells. Lower levels may indicate hemolytic anemia, while higher levels can suggest inflammation.

42 services41 patients

Magnesium level 83735

A magnesium level test is a simple blood test that measures the amount of magnesium in your body. Magnesium is a crucial mineral that helps your nerves, muscles, and heart function properly. The test can help detect health conditions like kidney disease or malnutrition.

42 services18 patients

Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223

Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.

42 services41 patients

Infusion into a vein for hydration, 31-60 minutes 96360

This is a procedure where a sterile solution is administered into your vein to help restore body fluid balance. It typically lasts between 31-60 minutes. It's a safe, common treatment for dehydration or to deliver medication.

38 services30 patients

Administration of additional new drug or substance into vein using push technique 96411

This procedure involves injecting a new medication or substance directly into your vein using a method called the 'push' technique. It's a quick way to deliver medication into your bloodstream for fast-acting relief or treatment.

33 services13 patients

Injection, fosnetupitant 235 mg and palonosetron 0.25 mg J1454

This is a combined medication injection used to prevent nausea and vomiting often associated with chemotherapy. Fosnetupitant blocks substance P/neurokinin 1, reducing the urge to vomit. Palonosetron prevents a chemical action in the brain that may cause nausea and vomiting.

27 services14 patients

Flow cytometry technique for dna or cell analysis, first marker 88184

Flow cytometry is a technique used to examine microscopic particles, like cells or DNA. It employs a beam of light to detect and measure physical and chemical characteristics of these particles. The 'first marker' refers to a specific characteristic or feature used to identify a particular cell or particle.

26 services24 patients

Infusion into a vein for therapy, prevention, or diagnosis concurrent with another infusion 96368

An infusion into a vein is a method of delivering medication, nutrients, or fluids directly into your bloodstream. If it's concurrent with another infusion, it means two different solutions are given at the same time. This can be for treatment, prevention, or diagnostic purposes.

24 services11 patients

Irrigation of implanted venous access drug delivery device 96523

Irrigation of an implanted venous access drug delivery device is a procedure to clean or unblock the device. This device is implanted under your skin to allow easy, frequent, and long-term access to your veins for medication delivery. The process involves flushing the device with a sterile solution to ensure it works properly.

24 services18 patients

Ultrasound of heart with color-depicted blood flow, rate, direction and valve function 93306

This is a heart ultrasound, also known as an echocardiogram. It uses sound waves to create pictures of your heart, showing how blood flows through it. The color depicts the blood flow's speed and direction. It also checks the heart's valves to ensure they're working properly.

21 services17 patients

Biopsy and aspiration of bone marrow sample for diagnosis 38222

A bone marrow biopsy and aspiration is a procedure where a small amount of bone marrow is removed for testing. It involves inserting a needle into a bone, typically the hip, to collect a sample. It can help diagnose various diseases and monitor treatment effectiveness.

15 services14 patients

Hospital Affiliations CMS Care Compare 3

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Suburban Hospital

Acute Care Hospitals · Bethesda, MD

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number210022

Location8600 Old Georgetown RoadBethesda, MD 20814 · Montgomery County

Emergency services

Adventist Healthcare Shady Grove Medical Center

Acute Care Hospitals · Rockville, MD

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number210057

Location9901 Medical Center DriveRockville, MD 20850 · Montgomery County

Emergency services Birthing friendly

Holy Cross Germantown Hospital

Acute Care Hospitals · Germantown, MD

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number210065

Location19801 Observation DriveGermantown, MD 20876 · Montgomery County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 20850 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$194.86 typical visit price

range $65.18 – $194.86

Typical copayment $48.71 (range $16.29 – $48.71)

Most-billed visit code 99205

Established Patient

$113.72 typical visit price

range $21.40 – $158.88

Typical copayment $28.43 (range $5.35 – $39.72)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

94.99/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Individually scored

Quality

86.58

Promoting Interoperability

100

Improvement Activities

Reported Quality Measures

Controlling High Blood Pressure

66%139 patients3/55-star benchmark: 91%

Oncology: Advance Care Planning in Metastatic Cancer Patients

57%111 patients3/55-star benchmark: 85%

Oncology: Medical and Radiation - Plan of Care for Pain

100%151 patients5/55-star benchmark: 100%

Oncology: Patient-Reported Pain Improvement

62%85 patients

Preventive Care and Screening: Screening for Depression and Follow-Up Plan

49%1,370 patients3/55-star benchmark: 97%

Provide Patients Electronic Access to Their Health Information

91%681 patients4/55-star benchmark: 100%

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Capecitabine, oral, 500 mg J8521

Treatment-Treatment - Miscellaneous · category RX029N

2 suppliers24 claims1,096 services$0.84 avg. paid by Medicare

Pharmacy supply fee for oral anti-cancer, oral anti-emetic or immunosuppressive drug(s); for the first prescription in a 30-day period Q0511

Treatment-Chemotherapy · category RH012N

2 suppliers21 claims21 services$18.93 avg. paid by Medicare

Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOSEPH M HAGGERTY M.D.

Internal Medicine (Hematology & Oncology)

9707 MEDICAL CENTER DR, SUITE 300
ROCKVILLE, MD 20850

Montgomery County (301) 424-6231

GEORGE A SOTOS M.D.

Internal Medicine (Hematology & Oncology)

9707 MEDICAL CENTER DR, SUITE 300
ROCKVILLE, MD 20850

Montgomery County (301) 424-6231

ONE SKINCARE, LLC

Dermatology

9707 MEDICAL CENTER DR
ROCKVILLE, MD 20850

Montgomery County (301) 512-5455

DR. PRISCILLA WU MD

Dermatology

9707 MEDICAL CENTER DR, SUITE 130
ROCKVILLE, MD 20850

Montgomery County (301) 738-0047

ADVANCED WEIGHT LOSS SURGERY

Surgery

9707 MEDICAL CENTER DR, SUITE 200
ROCKVILLE, MD 20850

Montgomery County (301) 251-4128

SALMAN ASHRUF MD PA

Plastic Surgery

9707 MEDICAL CENTER DR, SUITE 310
ROCKVILLE, MD 20850

Montgomery County (301) 315-0506

SAMUEL S. NORVELL, M.D.

Dermatology

9707 MEDICAL CENTER DR, SUITE130
ROCKVILLE, MD 20850

Montgomery County (301) 738-0047

BEVERLYN KUMI

Respiratory Therapist, Certified

9707 MEDICAL CENTER DR
ROCKVILLE, MD 20850

Montgomery County (301) 693-7001

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Wallmark's NPI number?

The NPI number for John Wallmark is 1689755365. It was assigned to this individual provider in the NPPES registry on October 18, 2006.

Where is John Wallmark located?

John Wallmark practices at 9707 Medical Center Dr Suite 300, Rockville, MD 20850. The listed phone number is (301) 424-6231.

What is John Wallmark's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is John Wallmark enrolled in Medicare?

Yes. John Wallmark is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for John Wallmark's services?

According to the CMS Revalidation Reassignment List (October 2026 release), John Wallmark reassigns Medicare benefits to Maryland Oncology Hematology, P.A. (Laurel, MD). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Wallmark's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is John Wallmark affiliated with any hospitals?

According to CMS data, John Wallmark is affiliated with Suburban Hospital, Adventist Healthcare Shady Grove Medical Center and Holy Cross Germantown Hospital.

When was this NPI record last updated?

The NPPES record for John Wallmark was last updated on August 1, 2012. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 14 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.