NPPES file of Aug 9, 2026

Michael Chin-Wah Fang-Yen, M.D.

Ophthalmology Physician · Union City, CA

Michael Chin-Wah Fang-Yen, M.D. is an ophthalmology physician with a practice address in Union City, California, and NPI 1366520868, issued on Nov 1, 2006. Check the license (California A85593, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1366520868
Name
Michael Chin-Wah Fang-Yen
Credential
M.D.
Primary taxonomy
Ophthalmology Physician 207W00000X
License number
A85593 CA
Self-reported in NPPES; status is on the state search
Practice location
3553 Whipple RD, Union City, CA 94587
Phone
(510) 454-1000
Enumerated
Nov 1, 2006
Record last updated
Dec 20, 2021 (not updated in 5 years: call before relying on the address or phone)
Medicare enrollment
Enrolled (PECOS I20040514001242); accepts Medicare assignment
Medical or professional school
University Of Minnesota, Duluth School Of Medicine, 1997
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →

Also registered at 3553 Whipple RD

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Jaishree Acharya, M.D.Internal Medicine Physician1053334920
  2. Marie Agleham, MDAdult Medicine Physician1649298209
  3. Muhammad Aleem, M.D.Internal Medicine Physician1952480006
  4. Eleanor Anderson-Williams, M.D.Internal Medicine Physician1164576815
  5. Kristina Austin, M.D.Ophthalmology Physician1417007238
  6. Vijaya Basawaprasad, M.D.Internal Medicine Physician1588736326

Verify Michael Chin-Wah Fang-Yen in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersMedical Board of California
    Search for license A85593    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the California license search

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21% more Medicare Part D claims than the average ophthalmology physician in 2024

1,844 Medicare Part D claims for 524 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 12 claims were for opioids.

  1. Michael Fang-Yen1,844
  2. Specialty average1,518

Most prescribed

  1. Latanoprost598 claims
  2. Dorzolamide-Timolol254 claims
  3. Brimonidine Tartrate186 claims
  4. Prednisolone Acetate159 claims
  5. Timolol Maleate109 claims
  6. Erythromycin81 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.

Bills Medicare through one group practice

  1. Permanente Medical Group IncFremont, CA

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).

Michael Chin-Wah Fang-Yen among 2,899 ophthalmology physician records in California

Michael Chin-Wah Fang-Yen, M.D. is one of 2,899 ophthalmology physician records with a practice address in California. 79% 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 9% of them.

  • NPI issued2006 · 9% of these records are older, 45% newer
  • In a Medicare fileYes · 79% of these records are
  • In the CMS Doctors and Clinicians fileYes · 66% of these records are
  • Graduated1997 · median 2001 among the 1,907 with a school on file
  • Record last updated2021 · 67% of these records were not updated in five years or more

Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

15 ophthalmology physician records list a practice address in Union City

They are 15 of the 1,006 NPPES records with a practice address in Union City, and 2,899 ophthalmology physician records in California.

All 2,899 in California → Every provider in Union City → Ophthalmology Physician nationwide →

The 8 ophthalmology physician records with the nearest ZIP codes

  1. Kristina Austin, M.D.Union City, CA 945871417007238
  2. John Chan, M.D.Union City, CA 945871609928837
  3. Sung Choe, M.D.Union City, CA 945871689752446
  4. Kari Eisley, M.D.Union City, CA 945871457558884
  5. Franklin Jeng, MDUnion City, CA 945871316560782
  6. Catherine Knox, M.D.Union City, CA 945871013095652
  7. James Lahey, M.D.Union City, CA 945871285712042
  8. Jeffrey Lehmer, M.D.Union City, CA 945871164500914

Common questions

What is Michael Chin-Wah Fang-Yen, M.D.'s NPI number?

Michael Chin-Wah Fang-Yen, M.D.'s National Provider Identifier (NPI) is 1366520868, issued on Nov 1, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Michael Chin-Wah Fang-Yen, M.D. located?

The NPPES record lists a practice address at 3553 Whipple RD, Union City, CA, 94587. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.

How can I verify Michael Chin-Wah Fang-Yen, M.D.'s license?

NPPES lists California license number A85593, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

How much does Michael Chin-Wah Fang-Yen, M.D. prescribe under Medicare Part D?

In 2024, Michael Chin-Wah Fang-Yen, M.D. had 1,844 Medicare Part D claims for 524 beneficiaries; the average among ophthalmology physician prescribers was 1,518. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.