John Pierpont Massey, M.D.
Internal Medicine Physician · Bethesda, MD
John Pierpont Massey, M.D. is an internal medicine physician with a practice address in Bethesda, Maryland, and NPI 1609969724, issued on Oct 2, 2006. Check the license on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- John Pierpont Massey
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- MD33079 DC
Self-reported in NPPES; status is on the state search - Practice location
- 8901 Rockville Pike, Bethesda, MD 20889
- Phone
- (301) 295-0196
- Enumerated
- Oct 2, 2006
- Record last updated
- Feb 19, 2025
- Fax
- (301) 400-0616
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Also registered at 8901 Rockville Pike
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Pierpont Massey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of PhysiciansCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average internal medicine physician in 2024
31 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
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.
John Pierpont Massey among 3,904 internal medicine physician records in Maryland
John Pierpont Massey, 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 fileNo · 63% of these records are
- Record last updated2025 · 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).
288 internal medicine physician records list a practice address in Bethesda
They are 288 of the 7,245 NPPES records with a practice address in Bethesda, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Bethesda → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Darrell Baranko, M.D.Bethesda, MD 208891366431082
- Jeffrey Blair, M.D.Bethesda, MD 208891184625378
- Richard Catherina, M.D.Bethesda, MD 208891437131505
- Kim Gibson, MDBethesda, MD 208891700861374
- Heather Grote, MDBethesda, MD 208891275512204
- Paul Han, MDBethesda, MD 208891144205162
- Douglas Hawk, M.D.Bethesda, MD 208891013990886
- Christopher Martin, M.D.Bethesda, MD 208891750362505
Common questions
What is John Pierpont Massey, M.D.'s NPI number?
John Pierpont Massey, M.D.'s National Provider Identifier (NPI) is 1609969724, issued on Oct 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Pierpont Massey, M.D. located?
The NPPES record lists a practice address at 8901 Rockville Pike, Bethesda, MD, 20889. Phone: (301) 295-0196. Providers update this record themselves, so call before visiting.
How can I verify John Pierpont Massey, M.D.'s license?
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 John Pierpont Massey, M.D. prescribe under Medicare Part D?
In 2024, John Pierpont Massey, M.D. had 31 Medicare Part D claims; 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.