NPPES file of Aug 9, 2026

Robert D. Mathieson, M.D.

Gastroenterology Physician · Baltimore, MD

Robert D. Mathieson, M.D. is a gastroenterology physician with a practice address in Baltimore, Maryland, and NPI 1982701959, issued on Sep 20, 2006. Check the license (Maryland D21327, as entered in NPPES) on the Maryland Board of Physicians; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1982701959
Name
Robert D. Mathieson
Credential
M.D.
Primary taxonomy
Gastroenterology Physician 207RG0100X
License number
D21327 MD
Self-reported in NPPES; status is on the state search
Practice location
3333 N Calvert St, Baltimore, MD 21218
Phone
(410) 243-4460
Enumerated
Sep 20, 2006
Record last updated
May 5, 2008 (not updated in 18 years: call before relying on the address or phone)
Medicaid ID
602700800 MD
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest gastroenterology physician records → All 505 in Maryland → Look up another NPI →

Also registered at 3333 N Calvert St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. William Arnold, P.A.-CPhysician Assistant1255351359
  2. Nancie Arsham, OTR LOccupational Therapist1316991300
  3. Raja Ayash, M.D.Pulmonary Disease Physician1285603498
  4. Nacime Salomao Barbachan Mansur, MD, PHDOrthopaedic Foot and Ankle Surgery Physician1417679192
  5. William Baugher, M.D.Orthopaedic Surgery Physician1689637522
  6. Abhijit Bhatia, MDGastroenterology Physician1144338658

Verify Robert D. Mathieson in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMaryland Board of Physicians
    Search for license D21327    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Maryland license search

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Robert D. Mathieson among 505 gastroenterology physician records in Maryland

Robert D. Mathieson, M.D. is one of 505 gastroenterology physician records with a practice address in Maryland. 81% 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 16% of them.

  • NPI issued2006 · 16% of these records are older, 46% newer
  • In a Medicare fileNo · 81% of these records are
  • In the CMS Doctors and Clinicians fileNo · 68% of these records are
  • Record last updated2008 · 61% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0100X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

Gastroenterology Physician providers in Maryland

There are 505 gastroenterology physician records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 505 in Maryland → Every provider in Baltimore → Gastroenterology Physician nationwide →

The 8 gastroenterology physician records with the nearest ZIP codes

  1. Abhijit Bhatia, MDBaltimore, MD 212181144338658
  2. John Rabine, M.D.Baltimore, MD 212151114912631
  3. Tsion Abdi, MDBaltimore, MD 212241881919637
  4. Daniel Bernstein, MDBaltimore, MD 212241710409503
  5. Robert Bulat, MDBaltimore, MD 212241831281658
  6. Kathy Bull-HenryBaltimore, MD 212241407854557
  7. Amit Kashyap, MDBaltimore, MD 212241912132382
  8. Ruhail Kohli, M.D.Baltimore, MD 212241124374418

Common questions

What is Robert D. Mathieson, M.D.'s NPI number?

Robert D. Mathieson, M.D.'s National Provider Identifier (NPI) is 1982701959, issued on Sep 20, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Robert D. Mathieson, M.D. located?

The NPPES record lists a practice address at 3333 N Calvert St, Baltimore, MD, 21218. Phone: (410) 243-4460. Providers update this record themselves, so call before visiting.

How can I verify Robert D. Mathieson, M.D.'s license?

NPPES lists Maryland license number D21327, 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.