Thomas M. Masterson, MD
Internal Medicine Physician · Clinton, MD
Thomas M. Masterson, MD is an internal medicine physician with a practice address in Clinton, Maryland, and NPI 1649224643, issued on May 22, 2006. Check the license (Maryland D50534, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Thomas M. Masterson
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- D50534 MD
0101038350 VA
Self-reported in NPPES; status is on the state search - Practice location
- 9106 Pine View LN, Clinton, MD 20735
- Phone
- (703) 356-2037
- Enumerated
- May 22, 2006
- Record last updated
- Sep 30, 2017 (not updated in 9 years: call before relying on the address or phone)
- Fax
- (703) 734-8987
- Medicare enrollment
- Enrolled (PECOS I20140326000433); accepts Medicare assignment
- Medical or professional school
- University Of Virginia School Of Medicine, 1984
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 9106 Pine View LN
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Patricia Grimes, NPFamily Nurse Practitioner1396841730
Verify Thomas M. Masterson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D50534Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
4.9 times the Medicare Part D claims of the average internal medicine physician in 2024
15,538 Medicare Part D claims for 600 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 139 claims were for opioids.
Most prescribed
- Atorvastatin Calcium1,072 claims
- Eliquis772 claims
- Gabapentin629 claims
- Amlodipine Besylate585 claims
- Mirtazapine440 claims
- Clopidogrel321 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $152.84
3 payments; by number, the most common kind was food and beverage; the largest payer was Acadia Pharmaceuticals Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- M Medical Group, Inc.Ellicott City, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas M. Masterson among 3,904 internal medicine physician records in Maryland
Thomas M. Masterson, MD is one of 3,904 internal medicine physician records with a practice address in Maryland. 77% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1984 · median 2003 among the 2,445 with a school on file
- Record last updated2017 · 59% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
26 internal medicine physician records list a practice address in Clinton
They are 26 of the 832 NPPES records with a practice address in Clinton, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Clinton → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Rasheed Abassi, M.D.Clinton, MD 207351376608620
- Joseph Avery,iii, M.D.Clinton, MD 207351841301769
- Herman Daniels, MDClinton, MD 207351235450099
- Kevin Ford, MDClinton, MD 207351275608184
- Keyteshia Guy, M.D.Clinton, MD 207351992964316
- Patrick Haugh, M.D.Clinton, MD 207351235122680
- Victor HerryClinton, MD 207351073642625
- Ifeoma Izuchukwu, M.D, MPH, FACPClinton, MD 207351811992738
Common questions
What is Thomas M. Masterson, MD's NPI number?
Thomas M. Masterson, MD's National Provider Identifier (NPI) is 1649224643, issued on May 22, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas M. Masterson, MD located?
The NPPES record lists a practice address at 9106 Pine View LN, Clinton, MD, 20735. Phone: (703) 356-2037. Providers update this record themselves, so call before visiting.
How can I verify Thomas M. Masterson, MD's license?
NPPES lists Maryland license number D50534, as entered by the provider. Search the Maryland Board of Physicians at https://www.mbp.state.md.us/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Thomas M. Masterson, MD prescribe under Medicare Part D?
In 2024, Thomas M. Masterson, MD had 15,538 Medicare Part D claims for 600 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.