Doctor profile · Federal record
Dr. Gerard Mullin, M.D.
Gastroenterology Physician (CMS: Gastroenterology) · Baltimore, MD
- NPI 1891746996
- 41 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
600 N Wolfe St
Baltimore, MD 212870005
(410) 955-4166 - Mailing address
-
Po Box 64264
Baltimore, MD 212644264
Credentials & registration
- NPI registered
- May 2006 — 20 yrs on file
- Profile last updated
- February 13, 2013
- Year of graduation
- 1985 — 41 yrs since
- Specialty taxonomy
- 207RG0100X — NUCC code
- State license (1)
- Maryland #D37257
- Medicaid
- MD #543361400
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1891746996. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
523
Distinct HCPCS
10
Medicare allowed
$81,510
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
43239 |
Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope | 71 | 70 | $104 | |
45380 |
Biopsy of large bowel using a flexible endoscope | 71 | 71 | $160 | |
91110 |
Imaging of digestive tract done from the inside of the digestive tract | 48 | 46 | $116 | |
45385 |
Removal of polyps or growths of large bowel using an endoscope with mechanical snare | 46 | 46 | $247 | |
91065 |
Measurement of hydrogen in breath to test for stomach and bowel symptoms | 41 | 38 | $93 | |
G0121 |
Colorectal cancer screening; colonoscopy on individual not meeting criteria for high risk | 38 | 38 | $176 | |
99203 |
New patient office or other outpatient visit, 30-44 minutes | 35 | 35 | $119 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 34 | 32 | $137 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 32 | 25 | $82 | |
99202 |
New patient office or other outpatient visit, 15-29 minutes | 26 | 26 | $78 |
In context: peer comparison
Among 49 peers in Baltimore Gastroenterology Physician, average services per provider: 49. This provider delivers 11× the peer median.Open Payments
Industry payments received
All-time total
$210
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Braintree Laboratories, INC. | 1 | $124.43 | |
| Aimmune Therapeutics, INC. | 1 | $85.52 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
186
Patients
85
Total drug cost
$15,167
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Omeprazole | Generic | 42 | 19 | $1,129 |
| Sod Sulf-Potass Sulf-Mag Sulf (Sodium, Potassium,Mag Sulfates) | Brand | 32 | 30 | $2,484 |
| Pantoprazole Sodium | Generic | 31 | 15 | $674 |
| Peg 3350-Electrolyte (Sodium Chloride/Nahco3/Kcl/Peg) | Brand | 23 | 21 | $622 |
| Esomeprazole Magnesium | Generic | 18 | 0 | $1,877 |
| Famotidine | Generic | 16 | 0 | $484 |
| Mesalamine | Generic | 13 | 0 | $5,437 |
| Lubiprostone | Generic | 11 | 0 | $2,460 |
Hospital affiliations
Frequently asked questions
What is Dr. Gerard Mullin's medical specialty?
Dr. Gerard Mullin practices Gastroenterology Physician in Baltimore, MD.
Where does Dr. Gerard Mullin practice?
Dr. Gerard Mullin practices at 600 N Wolfe St, Baltimore, MD 212870005. Office phone: 4109554166.
What is Dr. Gerard Mullin's NPI?
Dr. Gerard Mullin's National Provider Identifier (NPI) is 1891746996, issued by NPPES.
Does Dr. Gerard Mullin accept Medicare assignment?
Dr. Gerard Mullin does not accept Medicare assignment for all services. Patients may be billed amounts beyond Medicare-allowed charges.
What procedures does Dr. Gerard Mullin commonly perform?
Top Medicare-reported procedures in 2023: Biopsy of esophagus, stomach, and/or upper small bowel using a flexible endoscope (HCPCS 43239); Biopsy of large bowel using a flexible endoscope (HCPCS 45380); Imaging of digestive tract done from the inside of the digestive tract (HCPCS 91110). Source: CMS Medicare Physician & Other Practitioners file.