WILLIAM T DEROSA D.O.
NPI 1902894991
Internal Medicine - Medical Oncology in Morristown, NJ

Q: What is William Derosa's NPI number?

The NPI number for William Derosa is 1902894991. It was assigned to this individual provider in the NPPES registry on October 12, 2005.

Q: What is William Derosa's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Q: When was this NPI record last updated?

The NPPES record for William Derosa was last updated on April 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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 12, 2005PECOS EnrolledAccepts Medicare Assignment

95 MADISON AVE, MORRISTOWN, NJ 07960(973) 538-5210(973) 644-9657 Get Directions Write a Review

NPPES record last updated: April 8, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Apr 8, 2026, Jul 21, 2022, May 17, 2017 (3 updates tracked since 2017).

On this page

About William T Derosa D.o. NPPES

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

WILLIAM T DEROSA D.O. (NPI 1902894991) is an individual medical oncology provider in Morristown, New Jersey, licensed in New Jersey (25MB03927200) and active in the NPI registry since October 2005. He is enrolled in Medicare PECOS, is affiliated with Morristown Medical Center, and is a graduate of At Still University Of Health Sciences, College Of Osteo Med, Kirksville (1980).

NPPES Registry Identity

NPI1902894991

Entity TypeIndividualMale

Primary Taxonomy207RX0202X

Provider Legal NameWILLIAM T DEROSACredential: D.O.

Location Address95 MADISON AVEMorristown, NJ 07960-6092

Mailing Address95 Madison AveMorristown, NJ 07960-6092 · (973) 538-5210 · Fax (973) 644-9657

Phone(973) 538-5210

Fax(973) 644-9657

Sole ProprietorNo

Medical School CMSAt Still University Of Health Sciences, College Of Osteo Med, KirksvilleGraduated 1980

Enumeration DateOctober 12, 2005

Last NPPES UpdateApril 8, 20263 updates tracked since enumeration

NPPES CertifiedApril 8, 2026

✔ NPI 1902894991 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians

Taxonomy Code207RX0202X

License✔ Licensed in NJ · 25MB03927200

Definition

An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.

Also ListedInternal MedicineTaxonomy 207R00000X · License 25MB03927200 (NJ)

Also ListedInternal Medicine · HematologyTaxonomy 207RH0000X · License 25MB03927200 (NJ)

95 MADISON AVE, Morristown, NJ 07960

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Other Identifiers 1

Medicaid1092502NJ

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

William T Derosa D.o. 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 ID3072508860

PECOS Enrollment IDI20101018000124

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.

Areas of Expertise CMS Part B claims 27

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.

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.

519 services209 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.

512 services210 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.

429 services204 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.

423 services114 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.

418 services207 patients

Uric acid level, blood 84550

A blood uric acid level test measures the amount of uric acid in your blood. Uric acid is a waste product that your body produces when it breaks down purines, substances found in your body and in certain foods. High levels may lead to gout or kidney stones.

418 services207 patients

Phosphate level 84100

A phosphate level test measures the amount of phosphate in your blood. Phosphate is a chemical that contains the mineral phosphorus, crucial for energy production, muscle and nerve function, and bone growth. Imbalances may indicate kidney disease or other health issues.

417 services206 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.

333 services176 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.

243 services50 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.

150 services105 patients

Measurement of immunoglobulin light chains 83521

Measurement of immunoglobulin light chains is a blood test that helps to detect and monitor certain disorders related to your immune system. It measures the levels of specific proteins, known as light chains, produced by your immune cells.

131 services43 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.

117 services82 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.

116 services82 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.

116 services82 patients

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

90 services64 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.

90 services21 patients

Beta-2 microglobulin (protein) level 82232

The Beta-2 microglobulin level test measures the amount of this protein in your blood. It's often used to check kidney function or monitor certain cancers. High levels may indicate a health issue. The test involves a simple blood draw.

79 services47 patients

Protein measurement, serum 84165

A serum protein measurement is a blood test that determines the levels of proteins in your blood. It is used to evaluate your overall health, and diagnose nutritional problems, kidney disease, liver disease, or immune disorders.

75 services44 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

47 services23 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.

43 services43 patients

Immunologic analysis technique on serum (immunofixation) 86334

Immunofixation is a lab test that helps identify proteins called immunoglobulins in your blood serum. These proteins are part of your immune system. Changes in their levels can indicate certain diseases. The test is simple and only requires a blood sample.

40 services29 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.

32 services25 patients

Blood test, clotting time 85610

A clotting time blood test helps determine how quickly your blood forms clots, a process crucial to stop bleeding. During the test, a small blood sample is taken from your arm. The sample is then analyzed in a lab to see how long it takes for a clot to form.

29 services12 patients

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

18 services16 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.

17 services14 patients

Blood test, thyroid stimulating hormone (tsh) 84443

A TSH blood test measures the level of thyroid stimulating hormone in your body. This hormone is produced by the pituitary gland and regulates how your thyroid works. It's a simple procedure where a small amount of blood is drawn from your arm for analysis.

17 services13 patients

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

12 services12 patients

Hospital Affiliations CMS Care Compare 2

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

Morristown Medical Center

Acute Care Hospitals · Morristown, NJ

5/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number310015

Location100 Madison AveMorristown, NJ 07960 · Morris County

Emergency services Birthing friendly

Cooperman Barnabas Medical Center

Acute Care Hospitals · Livingston, NJ

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number310076

Location94 Old Short Hills RoadLivingston, NJ 07039 · Essex County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 07960 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

$190.92 typical visit price

range $63.84 – $190.92

Typical copayment $47.73 (range $15.96 – $47.73)

Most-billed visit code 99205

Established Patient

$111.57 typical visit price

range $20.97 – $155.92

Typical copayment $27.89 (range $5.24 – $38.98)

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.

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.

Ostomy skin barrier, with flange (solid, flexible or accordion), without built-in convexity, 4 x 4 inches or smaller, each A4414

DME-Orthotic Devices · category DF010N

1 supplier12 claims60 services$4.35 avg. paid by Medicare

Ostomy pouch, closed; for use on barrier with non-locking flange, with filter (2 piece), each A4419

DME-Orthotic Devices · category DF010N

1 supplier12 claims360 services$1.53 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.

DR. DAVID JOEL MEDFORD MD

Ophthalmology

95 MADISON AVE, SUITE 400
MORRISTOWN, NJ 07960

Morris County (973) 984-5005

SURGICAL SPECIALISTS OF NEW JERSEY

Specialist

95 MADISON AVE, SUITE 109
MORRISTOWN, NJ 07960

Morris County (976) 539-6900

MR. JACQUELINE ELIZABETH FEARON-CLARKE NURSE PRACTITIONER

Nurse Practitioner (Acute Care)

95 MADISON AVE, SUITE 411
MORRISTOWN, NJ 07960

Morris County (973) 971-4179

JULIANNA SHER OD

Optometrist

95 MADISON AVE
MORRISTOWN, NJ 07960

Morris County (973) 718-5780

DAVID I FREILICH MD

Internal Medicine (Interventional Cardiology)

95 MADISON AVE, STE A10
MORRISTOWN, NJ 07960

Morris County (973) 889-9001

SUMMIT MEDICAL GROUP PA

Durable Medical Equipment & Medical Supplies

95 MADISON AVE
MORRISTOWN, NJ 07960

Morris County (973) 524-7004

MICHELLE THURLOW

Physician Assistant (Surgical)

95 MADISON AVE
MORRISTOWN, NJ 07960

Morris County (908) 389-6340

PRIMARY CARE PARTNERS, LLC

Internal Medicine

95 MADISON AVE, SUITE A00
MORRISTOWN, NJ 07960

Morris County (973) 538-1388

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 William Derosa's NPI number?

The NPI number for William Derosa is 1902894991. It was assigned to this individual provider in the NPPES registry on October 12, 2005.

Where is William Derosa located?

William Derosa practices at 95 Madison Ave, Morristown, NJ 07960. The listed phone number is (973) 538-5210.

What is William Derosa's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is William Derosa enrolled in Medicare?

Yes. William Derosa 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.

Is William Derosa affiliated with any hospitals?

According to CMS data, William Derosa is affiliated with Morristown Medical Center and Cooperman Barnabas Medical Center.

When was this NPI record last updated?

The NPPES record for William Derosa was last updated on April 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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.