John Hahn, M.D.
NPI 1538272091 · Gastroenterology Physician · Bayonne, NJ
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Hahn, M.D. is a Gastroenterology Physician provider in Bayonne, NJ (NPI 1538272091).
Provider details
- NPI number
- 1538272091
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- Yes
- License
- MA48778 (NJ)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 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
557 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 Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 236 | $99 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 87 | $137 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 62 | $122 |
| Removal of Polyps Or Growths of Large Bowel Using an Endoscope With Mechanical Snare45385 | 47 | $267 |
| Biopsy of Esophagus, Stomach, And/Or Upper Small Bowel Using a Flexible Endoscope43239 | 33 | $93 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 16 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Omeprazole | 423 | 127 |
| Linaclotidebrand: Linzess | 77 | 21 |
| Mesalamine | 77 | 14 |
| Pantoprazole Sodium | 70 | 21 |
| Esomeprazole Magnesium | 58 | 18 |
| Dexlansoprazolebrand: Dexlansoprazole Dr | 55 | — |
| Obeticholic Acidbrand: Ocaliva | 28 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$514 across 19 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
- 2006-08-17
- Last updated
- 2023-06-29
- Certified
- 2023-06-29
Frequently asked questions
- What is John Hahn's NPI number?
- John Hahn's National Provider Identifier (NPI) is 1538272091, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Hahn's specialty?
- John Hahn is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is John Hahn located?
- John Hahn's practice location on file with NPPES is 534 Avenue E Ste 1c, Bayonne, NJ 07002-3987.
- What is John Hahn's phone number?
- The practice phone number listed in the NPPES registry for John Hahn is (201) 823-0450.
- Does John Hahn accept Medicare?
- John Hahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Hahn's NPI active?
- Yes — John Hahn's NPI (1538272091) is active in the NPPES registry as of the last update on 2023-06-29.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.