Martin Gregory, MD
NPI 1437530292 · Gastroenterology Physician · Saint Louis, MO
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Martin Gregory, MD is a Gastroenterology Physician provider in Saint Louis, MO (NPI 1437530292).
Provider details
- NPI number
- 1437530292
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 2017041356 (MO)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
11 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
317 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 88 | $119 |
| Biopsy of Large Bowel Using a Flexible Endoscope45380 | 50 | $141 |
| Established Patient Office Or Other Outpatient Visit With High Level of Medical Decision Making, If Using Time, 40 Minutes Or More99215 | 50 | $170 |
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 33 | $84 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 27 | $104 |
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 35 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ustekinumabbrand: Stelara | 104 | 16 |
| Diphenoxylate Hcl/Atropinebrand: Diphenoxylate-Atropine | 97 | 26 |
| Azathioprine | 81 | 21 |
| Omeprazole | 81 | 25 |
| Loperamide Hclbrand: Loperamide | 73 | 21 |
| 0.9 % Sodium Chloridebrand: Sodium Chloride | 67 | — |
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-G |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$295 across 10 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
- 2015-06-17
- Last updated
- 2025-04-17
Frequently asked questions
- What is Martin Gregory's NPI number?
- Martin Gregory's National Provider Identifier (NPI) is 1437530292, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Martin Gregory's specialty?
- Martin Gregory is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Martin Gregory located?
- Martin Gregory's practice location on file with NPPES is 1 Barnes Jewish Hospital Plz, Saint Louis, MO 63110-1003.
- What is Martin Gregory's phone number?
- The practice phone number listed in the NPPES registry for Martin Gregory is (314) 747-2066.
- Does Martin Gregory accept Medicare?
- Martin Gregory is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Martin Gregory's NPI active?
- Yes — Martin Gregory's NPI (1437530292) is active in the NPPES registry as of the last update on 2025-04-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.