Gerard Mullin, M.D.
NPI 1891746996 · Gastroenterology Physician · Baltimore, MD
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gerard Mullin, M.D. is a Gastroenterology Physician provider in Baltimore, MD (NPI 1891746996).
Provider details
- NPI number
- 1891746996
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- D37257 (MD)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
405 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 82 | $254 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 47 | $108 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 40 | $143 |
| Measurement of Hydrogen in Breath to Test for Stomach and Bowel Symptoms91065 | 38 | $77 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 34 | $112 |
| Imaging of Digestive Tract Done From the Inside of the Digestive Tract |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 7 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Pantoprazole Sodium | 42 | 20 |
| Omeprazole | 39 | 17 |
| Sodium, Potassium,mag Sulfatesbrand: Sod Sulf-Potass Sulf-Mag Sulf | 27 | 27 |
| Famotidine | 20 | — |
| Sodium Chloride/Nahco3/Kcl/Pegbrand: Peg 3350-Electrolyte | 18 | 18 |
| Mesalamine | 16 | — |
| Lubiprostone | 12 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$210 across 2 records (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-13
- Last updated
- 2013-02-13
Frequently asked questions
- What is Gerard Mullin's NPI number?
- Gerard Mullin's National Provider Identifier (NPI) is 1891746996, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerard Mullin's specialty?
- Gerard Mullin is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Gerard Mullin located?
- Gerard Mullin's practice location on file with NPPES is 600 N Wolfe St, Baltimore, MD 21287-0005.
- What is Gerard Mullin's phone number?
- The practice phone number listed in the NPPES registry for Gerard Mullin is (410) 955-4166.
- Does Gerard Mullin accept Medicare?
- Gerard Mullin is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gerard Mullin's NPI active?
- Yes — Gerard Mullin's NPI (1891746996) is active in the NPPES registry as of the last update on 2013-02-13.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.