Gerard Mullin, M.D.
Gastroenterology Physician · Baltimore, MD
Gerard Mullin, M.D. is a gastroenterology physician with a practice address in Baltimore, Maryland, and NPI 1891746996, issued on May 13, 2006. Check the license (Maryland D37257, as entered in NPPES) on the Maryland Board of Physicians; the Medicare figures below come from public CMS files.
- Name
- Gerard Mullin
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License number
- D37257 MD
Self-reported in NPPES; status is on the state search - Practice location
- 600 N Wolfe St, Baltimore, MD 21287
- Phone
- (410) 955-4166
- Enumerated
- May 13, 2006
- Record last updated
- Feb 13, 2013 (not updated in 13 years: call before relying on the address or phone)
- Medicaid ID
- 543361400 MD
- Medicare enrollment
- Enrolled (PECOS I20050830001001); may accept Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 505 in Maryland → Look up another NPI →
Also registered at 600 N Wolfe St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gerard Mullin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMaryland Board of Physicians
Search for license D37257Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
66% fewer Medicare Part D claims than the average gastroenterology physician in 2024
278 Medicare Part D claims for 111 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 29% of claims.
Most prescribed
- Pantoprazole Sodium42 claims
- Omeprazole39 claims
- Sod Sulf-Potass Sulf-Mag Sulf27 claims
- Famotidine20 claims
- Peg 3350-Electrolyte18 claims
- Mesalamine16 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.
Industry payments in 2024: $209.95
2 payments; by number, the most common kind was food and beverage; the largest payer was Braintree Laboratories, Inc. The 13,350 providers of this specialty with any payment received $5,015.95 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Johns Hopkins UniversityBaltimore, MD
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gerard Mullin among 505 gastroenterology physician records in Maryland
Gerard Mullin, 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. Its NPI, issued in 2006, is newer than 16% of them.
- NPI issued2006 · 16% of these records are older, 46% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated1985 · median 2002 among the 344 with a school on file
- Record last updated2013 · 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.
All 505 in Maryland → Every provider in Baltimore → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Marcia Canto, M.D.Baltimore, MD 212871992763015
- Mark Donowitz, M.D.Baltimore, MD 212871306893342
- Francis Giardiello, M.D.Baltimore, MD 212871437103645
- Michael Goggins, M.D.Baltimore, MD 212871861445983
- Ahmet Gurakar, MDBaltimore, MD 212871154330363
- Mary Harris, M.D.Baltimore, MD 212871932159738
- Anthony Kalloo, M.D.Baltimore, MD 212871881638153
- Sergey Kantsevoy, M.D., PH.D.Baltimore, MD 212871912954181
Common questions
What is Gerard Mullin, M.D.'s NPI number?
Gerard Mullin, M.D.'s National Provider Identifier (NPI) is 1891746996, issued on May 13, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gerard Mullin, M.D. located?
The NPPES record lists a practice address at 600 N Wolfe St, Baltimore, MD, 21287. Phone: (410) 955-4166. Providers update this record themselves, so call before visiting.
How can I verify Gerard Mullin, M.D.'s license?
NPPES lists Maryland license number D37257, 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.
How much does Gerard Mullin, M.D. prescribe under Medicare Part D?
In 2024, Gerard Mullin, M.D. had 278 Medicare Part D claims for 111 beneficiaries; the average among gastroenterology physician prescribers was 811. 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.