John T. Harrison, M.D.
Internal Medicine Physician · Baltimore, MD
John T. Harrison, M.D. is an internal medicine physician with a practice address in Baltimore, Maryland, and NPI 1770525636, issued on Jun 12, 2006. Check the license (Maryland D0044635, as entered in NPPES) on the Maryland Board of Physicians; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John T. Harrison
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- D0044635 MD
Self-reported in NPPES; status is on the state search - Practice location
- 2200 Kernan Dr, Baltimore, MD 21207
- Phone
- (410) 448-2500
- Enumerated
- Jun 12, 2006
- Record last updated
- Jul 13, 2026
- Entity
- Type 1 · individual
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A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John T. Harrison in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D0044635Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John T. Harrison among 3,904 internal medicine physician records in Maryland
John T. Harrison, 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 not. Its NPI, issued in 2006, is newer than 9% of them.
- NPI issued2006 · 9% of these records are older, 55% newer
- In a Medicare fileNo · 77% of these records are
- In the CMS Doctors and Clinicians fileNo · 63% of these records are
- 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).
1,278 internal medicine physician records list a practice address in Baltimore
They are 1,278 of the 35,183 NPPES records with a practice address in Baltimore, and 3,904 internal medicine physician records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 3,904 in Maryland → Every provider in Baltimore → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Charles Berko, M. D.Gwynn Oak, MD 212071114363819
- Virginie Chebou-Ngantchon, M.D.Baltimore, MD 212071194764514
- Carolyn Gibson, CRNPBaltimore, MD 212071124583950
- Peta-Gay Jackson-Booth, M.D.Baltimore, MD 212071760426902
- Cosmo Jacobs, MDBaltimore, MD 212071093798639
- Hema Patel, M.D.Baltimore, MD 212071679516660
- Nathan Rosenblum, M.DBaltimore, MD 212071730122128
- Karen Babitt, MDBaltimore, MD 212081073583787
Common questions
What is John T. Harrison, M.D.'s NPI number?
John T. Harrison, M.D.'s National Provider Identifier (NPI) is 1770525636, issued on Jun 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John T. Harrison, M.D. located?
The NPPES record lists a practice address at 2200 Kernan Dr, Baltimore, MD, 21207. Phone: (410) 448-2500. Providers update this record themselves, so call before visiting.
How can I verify John T. Harrison, M.D.'s license?
NPPES lists Maryland license number D0044635, 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.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. 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.