Joseph Emmanuel McClain, M.D.
Internal Medicine Physician · Gaithersburg, MD
Joseph Emmanuel McClain, M.D. is an internal medicine physician with a practice address in Gaithersburg, Maryland, and NPI 1194968297, issued on Apr 20, 2009. Check the license on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Joseph Emmanuel McClain
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036128625 IL
Self-reported in NPPES; status is on the state search - Practice location
- 655 Watkins Mill RD, Gaithersburg, MD 20879
- Phone
- (301) 848-8790
- Enumerated
- Apr 20, 2009
- Record last updated
- Jun 1, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicaid ID
- 3810023666 WV
- Medicare enrollment
- Enrolled (PECOS I20180927001192); accepts Medicare assignment
- Medical or professional school
- Eastern Virginia Medical School, 2009
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
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Verify Joseph Emmanuel McClain 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
92% fewer Medicare Part D claims than the average internal medicine physician in 2024
252 Medicare Part D claims for 94 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Nifedipine Er18 claims
- Amlodipine Besylate14 claims
- Cefuroxime13 claims
- Metoprolol Tartrate13 claims
- Amoxicillin-Clavulanate Potass11 claims
- Losartan Potassium11 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.
Bills Medicare through one group practice
- Kaiser Foundation Health Plan OF The Mid Atlantic States, IncLargo, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Joseph Emmanuel McClain among 3,904 internal medicine physician records in Maryland
Joseph Emmanuel McClain, 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 2009, is newer than 61% of them.
- NPI issued2009 · 61% of these records are older, 36% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2009 · median 2003 among the 2,445 with a school on file
- Record last updated2021 · 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).
67 internal medicine physician records list a practice address in Gaithersburg
They are 67 of the 2,580 NPPES records with a practice address in Gaithersburg, and 3,904 internal medicine physician records in Maryland.
All 3,904 in Maryland → Every provider in Gaithersburg → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Julie Chen, M.D.Gaithersburg, MD 208791629048467
- Jose De Leon Carpio, MDGaithersburg, MD 208791275682320
- Lingling Gao, D.O.Gaithersburg, MD 208791285959932
- Jean Hou, MDGaithersburg, MD 208791750442273
- Shailini Jain, MDGaithersburg, MD 208791588711022
- Supriya Janakiraman, M.D., M.P.H.Gaithersburg, MD 208791114361672
- Poonam Maru, DO, FACPGaithersburg, MD 208791780974329
- John Melnick, M. D.Gaithersburg, MD 208791679654651
Common questions
What is Joseph Emmanuel McClain, M.D.'s NPI number?
Joseph Emmanuel McClain, M.D.'s National Provider Identifier (NPI) is 1194968297, issued on Apr 20, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Joseph Emmanuel McClain, M.D. located?
The NPPES record lists a practice address at 655 Watkins Mill RD, Gaithersburg, MD, 20879. Phone: (301) 848-8790. Providers update this record themselves, so call before visiting.
How can I verify Joseph Emmanuel McClain, 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 Joseph Emmanuel McClain, M.D. prescribe under Medicare Part D?
In 2024, Joseph Emmanuel McClain, M.D. had 252 Medicare Part D claims for 94 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.