Michael Fang-Yen, M.D.
NPI 1366520868 · Ophthalmology Physician · Union City, CA
Enrolled with Medicare as Practitioner - Ophthalmology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Michael Fang-Yen, M.D. is a Ophthalmology Physician provider in Union City, CA (NPI 1366520868).
Provider details
- NPI number
- 1366520868
- Entity type
- Individual
- Primary specialty
- Ophthalmology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- A85593 (CA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 · 19 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 598 | 259 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 254 | 107 |
| Brimonidine Tartrate | 186 | 74 |
| Prednisolone Acetate | 159 | 105 |
| Timolol Maleate | 109 | 48 |
| Erythromycin Basebrand: Erythromycin | 81 | 50 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 79 | 64 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-11-01
- Last updated
- 2021-12-20
Frequently asked questions
- What is Michael Fang-Yen's NPI number?
- Michael Fang-Yen's National Provider Identifier (NPI) is 1366520868, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Michael Fang-Yen's specialty?
- Michael Fang-Yen is listed in the NPPES registry with a primary specialty of Ophthalmology Physician (Allopathic & Osteopathic Physicians).
- Where is Michael Fang-Yen located?
- Michael Fang-Yen's practice location on file with NPPES is 3553 Whipple Rd, Union City, CA 94587-1507.
- What is Michael Fang-Yen's phone number?
- The practice phone number listed in the NPPES registry for Michael Fang-Yen is (510) 454-1000.
- Does Michael Fang-Yen accept Medicare?
- Michael Fang-Yen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Michael Fang-Yen's NPI active?
- Yes — Michael Fang-Yen's NPI (1366520868) is active in the NPPES registry as of the last update on 2021-12-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.