Thomas E. Maslen, M.D.
Internal Medicine Physician · Greenbelt, MD
Thomas E. Maslen, M.D. is an internal medicine physician with a practice address in Greenbelt, Maryland, and NPI 1699742791, issued on Mar 7, 2006. Check the license (Maryland D55559, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Thomas E. Maslen
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D55559 MD
Self-reported in NPPES; status is on the state search - Practice location
- 7525 Greenway Center Dr, Greenbelt, MD 20770
- Phone
- (301) 220-0200
- Enumerated
- Mar 7, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (301) 345-6956
- Medicare enrollment
- Enrolled (PECOS I20090817000238); accepts Medicare assignment
- Medical or professional school
- University Of Maryland School Of Medicine, 1997
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 7525 Greenway Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Thomas E. Maslen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D55559Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.5 times the Medicare Part D claims of the average internal medicine physician in 2024
7,989 Medicare Part D claims for 615 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 184 claims were for opioids.
Most prescribed
- Atorvastatin Calcium657 claims
- Amlodipine Besylate300 claims
- Levothyroxine Sodium229 claims
- Rosuvastatin Calcium229 claims
- Hydrochlorothiazide170 claims
- Metformin Hcl168 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: $47.01
2 payments; by number, the most common kind was food and beverage; the largest payer was Silk Road Medical, 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
- Privia Care Center LLCGreenbelt, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Thomas E. Maslen among 3,904 internal medicine physician records in Maryland
Thomas E. Maslen, M.D. 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
- Graduated1997 · median 2003 among the 2,445 with a school on file
- Record last updated2026 · 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).
17 internal medicine physician records list a practice address in Greenbelt
They are 17 of the 1,332 NPPES records with a practice address in Greenbelt, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Greenbelt → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Cecil George, MDGreenbelt, MD 207701245311000
- Elham Ghayouri Azar, M.DGreenbelt, MD 207701487998381
- Renuka Gupta, M.D.Greenbelt, MD 207701366419566
- Karina Jordan, MDGreenbelt, MD 207701982083879
- Aruna Nathan, MDGreenbelt, MD 207701063437804
- Babajide Obadina, M.D.Greenbelt, MD 207701215910054
- Ramesh Patel, M DGreenbelt, MD 207701528082229
- Jessica Petros, M.D.Greenbelt, MD 207701528231016
Common questions
What is Thomas E. Maslen, M.D.'s NPI number?
Thomas E. Maslen, M.D.'s National Provider Identifier (NPI) is 1699742791, issued on Mar 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Thomas E. Maslen, M.D. located?
The NPPES record lists a practice address at 7525 Greenway Center Dr, Greenbelt, MD, 20770. Phone: (301) 220-0200. Providers update this record themselves, so call before visiting.
How can I verify Thomas E. Maslen, M.D.'s license?
NPPES lists Maryland license number D55559, 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 E. Maslen, M.D. prescribe under Medicare Part D?
In 2024, Thomas E. Maslen, M.D. had 7,989 Medicare Part D claims for 615 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.