MARK A WILLIAMS MD
NPI 1033114988
Internal Medicine in Johnson City, TN

Q: What is Mark Williams's NPI number?

The NPI number for Mark Williams is 1033114988. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Q: What is Mark Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on February 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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 June 16, 2005PECOS EnrolledAccepts Medicare Assignment

301 MED TECH PKWY, STE 240, JOHNSON CITY, TN 37604(423) 794-5520(423) 282-6940 Get Directions Write a Review

NPPES record last updated: February 24, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Feb 24, 2025, Mar 2, 2018, Nov 19, 2017 and 1 more (4 updates tracked since 2016).

On this page

About Mark A Williams Md NPPES

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

MARK A WILLIAMS MD (NPI 1033114988) is an individual internal medicine provider in Johnson City, Tennessee, licensed in Tennessee (24923) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS, is affiliated with Wellmont Holston Valley Medical Center, and is a graduate of University Of Tennessee, Hsc, College Of Medicine (1992).

NPPES Registry Identity

NPI1033114988

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameMARK A WILLIAMSCredential: MD

Location Address301 MED TECH PKWY, STE 240Johnson City, TN 37604-2364

Mailing AddressPo Box 632476Cincinnati, OH 45263-2476 · (423) 794-5520 · Fax (423) 282-6940

Phone(423) 794-5520

Fax(423) 282-6940

Sole ProprietorNo

Medical School CMSUniversity Of Tennessee, Hsc, College Of MedicineGraduated 1992

Enumeration DateJune 16, 2005

Last NPPES UpdateFebruary 24, 20254 updates tracked since enumeration

NPPES CertifiedFebruary 24, 2025

✔ NPI 1033114988 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in TN · 24923

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

301 MED TECH PKWY, Johnson City, TN 37604

Open in Google Maps ↗

Other Identifiers 2

Medicaid1521184TN

Medicaid3091551TN

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include BlueCross BlueShield of Tennessee, UnitedHealthcare.Insurance ›

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

Mark A Williams Md 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 ID7719020940

PECOS Enrollment IDI20100210000097

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 42

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.

692 services316 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.

671 services311 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.

581 services312 patients

Blood test, lipids (cholesterol and triglycerides) 80061

A lipid panel is a blood test that measures fats and fatty substances, such as cholesterol and triglycerides. These substances are used by your body as a source of energy. High levels can lead to health issues, including heart disease.

439 services298 patients

Hemoglobin a1c level 83036

Hemoglobin A1c (HbA1c) is a test that measures your average blood sugar level over the past 2-3 months. It's used to monitor how well diabetes is being controlled. High levels may indicate that your diabetes treatment plan needs adjustment.

362 services187 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.

327 services277 patients

Thyroxine (thyroid chemical), free 84439

The Thyroxine (thyroid chemical), free test is a blood test that measures the level of free T4 in your body. T4 is a hormone produced by your thyroid gland and is essential for growth and metabolism. If your T4 levels are too high or too low, it could indicate a thyroid disorder.

323 services274 patients

Complete blood cell count (red cells, white blood cell, platelets), automated test 85027

A complete blood cell count (CBC) is an automated test that measures different components of the blood, including red cells, white cells, and platelets. It helps assess overall health, detect disorders like anemia or infection, and monitor medical treatments.

284 services225 patients

Injection, triamcinolone acetonide, not otherwise specified, 10 mg J3301

Triamcinolone acetonide is a medication used to reduce inflammation in the body. It's given as a 10 mg injection for conditions like allergies, arthritis, or skin problems. The injection helps to decrease swelling, redness, and itching.

276 services52 patients

Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439

An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.

211 services211 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.

201 services72 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.

191 services36 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.

156 services105 patients

Creatinine level to test for kidney function or muscle injury 82570

A creatinine level test measures the amount of creatinine in your blood. This substance is a waste product from normal muscle use. Higher levels can indicate possible kidney dysfunction or muscle injury. This test helps monitor kidney health.

153 services139 patients

Urine microalbumin (protein) level 82043

The urine microalbumin level test measures the amount of a protein called albumin in your urine. This test helps to detect early signs of kidney damage. High levels of albumin may suggest your kidneys aren't functioning properly. It's a simple, non-invasive test that involves providing a urine sample.

152 services138 patients

Vitamin d-3 level 82306

A Vitamin D-3 level test measures the amount of Vitamin D-3, a crucial nutrient, in your body. This test helps identify if your levels are too low or too high. Low levels may lead to bone weakness, while high levels could harm your kidneys. It's a simple blood test.

148 services117 patients

Injection, ceftriaxone sodium, per 250 mg J0696

Ceftriaxone sodium is an antibiotic injection used to treat a variety of bacterial infections. Each injection contains 250 mg of the medicine. It works by stopping the growth of bacteria in your body.

98 services13 patients

Prostate cancer screening; prostate specific antigen test (psa) G0103

Prostate cancer screening involves a simple blood test known as the Prostate Specific Antigen (PSA) test. This test measures the level of PSA in your blood. Higher than normal levels can be an early indication of prostate issues, including cancer. It's a key tool in early detection.

83 services83 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.

77 services14 patients

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

68 services68 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

65 services65 patients

Manual urinalysis test with examination using microscope, automated 81001

A manual urinalysis test with automated microscopic examination is a lab process that checks your urine for health indicators. It involves a machine scanning your sample to identify any abnormal elements, which can assist in diagnosing various conditions.

64 services41 patients

Cyanocobalamin (vitamin b-12) level 82607

A Cyanocobalamin (Vitamin B-12) level test is a blood test that checks the amount of Vitamin B-12 in your body. This vitamin is vital for nerve function and the creation of red blood cells. Low or high levels could indicate a potential health issue.

55 services47 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.

51 services42 patients

Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report 93000

An electrocardiogram (ECG) is a non-invasive test that records your heart's electrical activity. Using 12 leads attached to your body, it captures data to help identify heart conditions. A doctor interprets the results and provides a report.

48 services45 patients

Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month 99490

Chronic care management services involve a healthcare professional directing clinical staff in managing your chronic conditions. This includes the first 20 minutes per month of services like medication management, care coordination, and health monitoring to help improve your health and quality of life.

38 services12 patients

Blood test, basic group of blood chemicals (calcium, total) 80048

A basic group blood test measures the levels of certain chemicals in your blood, including calcium. This helps assess your overall health and detect potential problems. The procedure involves drawing a small amount of blood from your arm, which is then analyzed in a lab.

35 services27 patients

Automated urinalysis test 81003

An automated urinalysis test is a routine examination that checks your urine for various substances. It can help identify potential health issues such as kidney problems or diabetes. The test uses a machine to analyze a small urine sample, providing quick and accurate results.

33 services27 patients

Physician or allowed practitioner re-certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians a G0179

This procedure involves a doctor or approved practitioner reviewing your health status and re-certifying your need for Medicare-covered home health services. It includes communication with the home health agency and assessment of your health reports, even when you're not physically present.

33 services22 patients

Transitional care management services for problem of at least moderate complexity 99495

Transitional care management services focus on coordinating and managing your care after you leave the hospital. For moderate complexity problems, this involves managing your medications, arranging further treatments, and ensuring you have the necessary follow-ups.

31 services29 patients

Testing for presence of drug, by chemistry analyzers 80307

Chemistry analyzers are used to detect the presence of drugs in your system. This test involves taking a small sample of your blood or urine. The sample is then analyzed for specific substances. The results help in understanding your health condition better.

28 services20 patients

Detection test by immunoassay with direct visual observation for influenza virus 87804

This is a test that identifies the influenza virus in your body. It works by using an immunoassay, a method that detects the presence of the virus through an immune response. The results are directly observable, making it a quick and efficient way to diagnose flu.

26 services13 patients

Physician or allowed practitioner certification for medicare-covered home health services under a home health plan of care (patient not present), including contacts with home health agency and review of reports of patient status required by physicians and G0180

This is a service where a doctor or authorized practitioner certifies that you require Medicare-covered home health services. They will communicate with the home health agency and review reports on your health status to ensure you receive appropriate care. This does not involve an in-person visit.

26 services22 patients

Annual wellness visit; includes a personalized prevention plan of service (pps), initial visit G0438

An annual wellness visit is a yearly appointment with your doctor to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's an opportunity to discuss your health status and goals and get a plan tailored for you.

19 services19 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.

15 services13 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.

13 services12 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.

13 services12 patients

Amplifed dna or rna probe detection of severe acute respiratory syndrome coronavirus 2 (covid-19) antigen 87635

This is a lab test that detects the presence of COVID-19 in your body. It uses a technique to amplify the virus's genetic material, either DNA or RNA, making it easier to identify. A positive result indicates an active infection.

13 services13 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.

13 services13 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.

12 services11 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.

12 services12 patients

Red blood cell sedimentation rate, to detect inflammation, automated 85652

The Red Blood Cell Sedimentation Rate is a test that helps detect inflammation in the body. It's automated, meaning a machine does the work. This test measures how fast red blood cells settle at the bottom of a tube in an hour. A faster rate may indicate inflammation.

11 services11 patients

Hospital Affiliations CMS Care Compare 4

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

Wellmont Holston Valley Medical Center

Acute Care Hospitals · Kingsport, TN

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440017

Location130 West Ravine RoadKingsport, TN 37662 · Sullivan County

Emergency services

Sycamore Shoals Hospital

Acute Care Hospitals · Elizabethton, TN

2/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440018

Location1501 West Elk AvenueElizabethton, TN 37643 · Carter County

Emergency services

Johnson City Medical Center

Acute Care Hospitals · Johnson City, TN

1/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440063

Location400 N State Of Franklin RdJohnson City, TN 37604 · Washington County

Emergency services Birthing friendly

Franklin Woods Community Hospital

Acute Care Hospitals · Johnson City, TN

4/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number440184

Location300 Med Tech ParkwayJohnson City, TN 37604 · Washington County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 37604 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

$121.80 typical visit price

range $52.64 – $160.89

Typical copayment $30.45 (range $13.16 – $40.22)

Most-billed visit code 99204

Established Patient

$93.60 typical visit price

range $16.72 – $131.41

Typical copayment $23.40 (range $4.18 – $32.85)

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 15

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

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253

DME-Other DME · category DE017N

26 suppliers69 claims240 services$5.82 avg. paid by Medicare

Lancets, per box of 100 A4259

DME-Medical/Surgical Supplies · category DA000N

12 suppliers23 claims41 services$1.14 avg. paid by Medicare

Tubing with integrated heating element for use with positive airway pressure device A4604

DME-Other DME · category DE001N

8 suppliers27 claims27 services$36.07 avg. paid by Medicare

Full face mask used with positive airway pressure device, each A7030

DME-Other DME · category DE001N

8 suppliers20 claims20 services$92.64 avg. paid by Medicare

Face mask interface, replacement for full face mask, each A7031

DME-Other DME · category DE001N

7 suppliers22 claims52 services$38.06 avg. paid by Medicare

Cushion for use on nasal mask interface, replacement only, each A7032

DME-Other DME · category DE001N

4 suppliers23 claims129 services$19.25 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.

SHELLY J MCINTOSH FNP

Nurse Practitioner (Family)

301 MED TECH PKWY, SUITE 240
JOHNSON CITY, TN 37604

Washington County (423) 794-5520

ARIEL DENTON APN

Nurse Practitioner (Women's Health)

301 MED TECH PKWY, SUITE 200
JOHNSON CITY, TN 37604

Washington County (423) 794-1300

MICHAEL Z PEARSON MD

Internal Medicine

301 MED TECH PKWY, STE. 280
JOHNSON CITY, TN 37604

Washington County (423) 794-5550

TRACY ROMANS NP

Nurse Practitioner (Family)

301 MED TECH PKWY, SUITE 240
JOHNSON CITY, TN 37604

Washington County (423) 794-5888

BRIAN H DUNKELBERGER M.D.

Obstetrics & Gynecology

301 MED TECH PKWY, STE. 200
JOHNSON CITY, TN 37604

Washington County (423) 794-1300

AMBER C PLOUCHA NP-C

Nurse Practitioner

301 MED TECH PKWY, SUITE 240
JOHNSON CITY, TN 37604

Washington County (423) 794-5520

ERIN MCPHERSON

Registered Nurse (Lactation Consultant)

301 MED TECH PKWY, SUITE 160
JOHNSON CITY, TN 37604

Washington County (423) 794-5560

MARCIA M SENTELL M.D.

Obstetrics & Gynecology

301 MED TECH PKWY, STE 200
JOHNSON CITY, TN 37604

Washington County (423) 794-1300

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 Mark Williams's NPI number?

The NPI number for Mark Williams is 1033114988. It was assigned to this individual provider in the NPPES registry on June 16, 2005.

Where is Mark Williams located?

Mark Williams practices at 301 Med Tech Pkwy Ste 240, Johnson City, TN 37604. The listed phone number is (423) 794-5520.

What is Mark Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mark Williams enrolled in Medicare?

Yes. Mark Williams 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.

What insurance does Mark Williams accept?

Health plans from BlueCross BlueShield of Tennessee and UnitedHealthcare list Mark Williams as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mark Williams affiliated with any hospitals?

According to CMS data, Mark Williams is affiliated with Wellmont Holston Valley Medical Center, Sycamore Shoals Hospital, Johnson City Medical Center and Franklin Woods Community Hospital.

When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on February 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.