Michael Ahn, MD
NPI 1225115173 · Gastroenterology Physician · Santa Clara, CA
Enrolled with Medicare as Practitioner - Gastroenterology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Ahn, MD is a Gastroenterology Physician provider in Santa Clara, CA (NPI 1225115173).
Provider details
- NPI number
- 1225115173
- Entity type
- Individual
- Primary specialty
- Gastroenterology PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- G80248 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure33% of score
19 yrs in NPPES registry
- Profile completeness33% of score
100% of core fields populated
- Practice footprint20% of score
1 documented practice location
- Open Payments transparency13% of score
Has Open Payments disclosures (2024)
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 methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Peg3350/Sod Sulf,bicarb,cl/Kclbrand: Gavilyte-C | 102 | 100 |
| Mesalamine | 77 | 21 |
| Omeprazole | 65 | 35 |
| Pantoprazole Sodium | 33 | 13 |
| Lubiprostone | 29 | — |
| Famotidine | 19 | 12 |
| Linaclotidebrand: Linzess | 18 | — |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$43 across 1 record (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
- 2006-10-31
- Last updated
- 2021-12-06
Frequently asked questions
- What is Michael Ahn's NPI number?
- Michael Ahn's National Provider Identifier (NPI) is 1225115173, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Ahn's specialty?
- Michael Ahn is listed in the NPPES registry with a primary specialty of Gastroenterology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Ahn located?
- Michael Ahn's practice location on file with NPPES is 710 Lawrence Expy, Santa Clara, CA 95051-5173.
- What is Michael Ahn's phone number?
- The practice phone number listed in the NPPES registry for Michael Ahn is (408) 851-1000.
- Does Michael Ahn accept Medicare?
- Michael Ahn is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Ahn's NPI active?
- Yes — Michael Ahn's NPI (1225115173) is active in the NPPES registry as of the last update on 2021-12-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.