John C. Hahn, M.D.
Gastroenterology Physician · Bayonne, NJ
John C. Hahn, M.D. is a gastroenterology physician with a practice address in Bayonne, New Jersey, and NPI 1538272091, issued on Aug 17, 2006. Check the license (New Jersey 25MA04877800, as entered in NPPES) on the New Jersey State Board of Medical Examiners; the Medicare figures below come from public CMS files.
- Name
- John C. Hahn
- Credential
- M.D.
- Primary taxonomy
- Gastroenterology Physician 207RG0100X
- License numbers
- 25MA04877800 NJ
MA48778 NJ
Self-reported in NPPES; status is on the state search - Practice location
- 534 Avenue E Ste 1C, Bayonne, NJ 07002
- Phone
- (201) 823-0450
- Enumerated
- Aug 17, 2006
- Record last updated
- Jun 29, 2023
- Fax
- (201) 823-3311
- Medicaid ID
- 3416909 NJ
- Medicare enrollment
- Enrolled (PECOS I20050621001001); accepts Medicare assignment
- Medical or professional school
- Rutgers New Jersey Medical School, 1985
- Entity
- Type 1 · individual
8 nearest gastroenterology physician records → All 735 in New Jersey → Look up another NPI →
Verify John C. Hahn in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Jersey State Board of Medical Examiners
Search for license 25MA04877800Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
35% more Medicare Part D claims than the average gastroenterology physician in 2024
1,098 Medicare Part D claims for 259 beneficiaries, against an average of 811 among the 16,445 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims.
Most prescribed
- Omeprazole423 claims
- Linzess77 claims
- Mesalamine77 claims
- Pantoprazole Sodium70 claims
- Esomeprazole Magnesium58 claims
- Dexlansoprazole Dr55 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: $514.21
19 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Biotech, 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.
John C. Hahn among 735 gastroenterology physician records in New Jersey
John C. Hahn, M.D. is one of 735 gastroenterology physician records with a practice address in New Jersey. 89% 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 12% of them.
- NPI issued2006 · 12% of these records are older, 44% newer
- In a Medicare fileYes · 89% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated1985 · median 2000 among the 564 with a school on file
- Record last updated2023 · 54% 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 New Jersey practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Gastroenterology Physician providers in New Jersey
There are 735 gastroenterology physician records in New Jersey.
All 735 in New Jersey → Every provider in Bayonne → Gastroenterology Physician nationwide →
The 8 gastroenterology physician records with the nearest ZIP codes
- Zahava Farkas, DOBayonne, NJ 070021043697824
- Kovil Ramasamy, M.D.,Bayonne, NJ 070021790765576
- Mohammad Bajwa, MDBloomfield, NJ 070031720162951
- Louis Celebre, MDBloomfield, NJ 070031871688440
- Jozsef Duhl, MDAvenel, NJ 070011043393317
- Richard Pizzano, MDBloomfield, NJ 070031881621407
- Masood Rizvi, M.D.Cedar Grove, NJ 070091750392197
- Susan Fishbein, MDCliffside Park, NJ 070101205945086
Common questions
What is John C. Hahn, M.D.'s NPI number?
John C. Hahn, M.D.'s National Provider Identifier (NPI) is 1538272091, issued on Aug 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John C. Hahn, M.D. located?
The NPPES record lists a practice address at 534 Avenue E Ste 1C, Bayonne, NJ, 07002. Phone: (201) 823-0450. Providers update this record themselves, so call before visiting.
How can I verify John C. Hahn, M.D.'s license?
NPPES lists New Jersey license number 25MA04877800, as entered by the provider. Search the New Jersey State Board of Medical Examiners at https://newjersey.mylicense.com/verification/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does John C. Hahn, M.D. prescribe under Medicare Part D?
In 2024, John C. Hahn, M.D. had 1,098 Medicare Part D claims for 259 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.