Robert Stewart Hagan, M.D., PH.D.
Internal Medicine Physician · Baltimore, MD
Robert Stewart Hagan, M.D., PH.D. is an internal medicine physician with a practice address in Baltimore, Maryland, and NPI 1265635858, issued on Jun 9, 2007. Check the license (Maryland 22260, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Robert Stewart Hagan
- Credential
- M.D., PH.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 22260 MD
Self-reported in NPPES; status is on the state search - Practice location
- Johns Hopkins Medicine, Baltimore, MD 21287
- Phone
- (410) 955-7963
- Enumerated
- Jun 9, 2007
- Record last updated
- Apr 5, 2012 (not updated in 14 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20141106001384); accepts Medicare assignment
- Medical or professional school
- Harvard Medical School, 2007
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 3,904 in Maryland → Look up another NPI →
Verify Robert Stewart Hagan in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license 22260Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- University OF North Carolina AT Chapel HillChapel Hill, NC
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert Stewart Hagan among 3,904 internal medicine physician records in Maryland
Robert Stewart Hagan, M.D., PH.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 2007, is newer than 45% of them.
- NPI issued2007 · 45% of these records are older, 44% newer
- In a Medicare fileYes · 77% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2007 · median 2003 among the 2,445 with a school on file
- Record last updated2012 · 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.
All 3,904 in Maryland → Every provider in Baltimore → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Lawrence Appel, M.D.Baltimore, MD 212871366407066
- Bimal Ashar, M.D.Baltimore, MD 212871306801147
- Patricia Barditch-Crovo, M.D.Baltimore, MD 212871477518033
- Eric Bass, M.D.Baltimore, MD 212871346205416
- Christie Basseth, M.D.Baltimore, MD 212871972568426
- Mary Catherine Beach, M.D.Baltimore, MD 212871598720922
- Valeriani Bead, M.D.Baltimore, MD 212871396700720
- Gail Berkenblit, M.D.Baltimore, MD 212871841256781
Common questions
What is Robert Stewart Hagan, M.D., PH.D.'s NPI number?
Robert Stewart Hagan, M.D., PH.D.'s National Provider Identifier (NPI) is 1265635858, issued on Jun 9, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Robert Stewart Hagan, M.D., PH.D. located?
The NPPES record lists a practice address at Johns Hopkins Medicine, Baltimore, MD, 21287. Phone: (410) 955-7963. Providers update this record themselves, so call before visiting.
How can I verify Robert Stewart Hagan, M.D., PH.D.'s license?
NPPES lists Maryland license number 22260, 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. 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.