Marcellus Tin-Yau Chow, OD
Optometrist · San Francisco, CA
Marcellus Tin-Yau Chow, OD is an optometrist with a practice address in San Francisco, California, and NPI 1194890012, issued on Nov 24, 2006. Check the license (California 12033T, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marcellus Tin-Yau Chow
- Credential
- OD
- Primary taxonomy
- Optometrist 152W00000X
- License number
- 12033T CA
Self-reported in NPPES; status is on the state search - Practice location
- 3201 Mission St, San Francisco, CA 94110
- Phone
- (415) 648-3600
- Enumerated
- Nov 24, 2006
- Record last updated
- Dec 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (415) 648-0719
- Medicare enrollment
- Enrolled (PECOS I20120803000361); accepts Medicare assignment
- Medical or professional school
- University Of California - School Of Optometry, 1998
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 3201 Mission St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Brian Snydsman, O.D.Optometrist1881929222
Verify Marcellus Tin-Yau Chow in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 12033TCheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% more Medicare Part D claims than the average optometrist in 2024
394 Medicare Part D claims for 114 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 8% of claims.
Most prescribed
- Latanoprost199 claims
- Dorzolamide Hcl51 claims
- Dorzolamide-Timolol31 claims
- Timolol Maleate30 claims
- Levobunolol Hcl23 claims
- Cyclosporine15 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: $133.69
2 payments; by number, the most common kind was food and beverage; the largest payer was Oyster Point Pharma, Inc. The 34,453 providers of this specialty with any payment received $769.99 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Marcellus Tin-Yau Chow among 8,308 optometrist records in California
Marcellus Tin-Yau Chow, OD is one of 8,308 optometrist records with a practice address in California. 67% 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 6% of them.
- NPI issued2006 · 6% of these records are older, 66% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated1998 · median 2008 among the 3,573 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 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in San Francisco → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Aristides Carcamo, O.D.San Francisco, CA 941101891762894
- Randall Go, O.D.San Francisco, CA 941101538234026
- Martha Klufas, O.D.San Francisco, CA 941101336320928
- Angie Lau, O.D.San Francisco, CA 941101457412140
- Albert Lee, O.DSan Francisco, CA 941101124221510
- Cristina Partida, O.D.San Francisco, CA 941101932540556
- Ruby Sanchez, O.D.San Francisco, CA 941101023086006
- Allen Shiba, ODSan Francisco, CA 941101306044250
Common questions
What is Marcellus Tin-Yau Chow, OD's NPI number?
Marcellus Tin-Yau Chow, OD's National Provider Identifier (NPI) is 1194890012, issued on Nov 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Marcellus Tin-Yau Chow, OD located?
The NPPES record lists a practice address at 3201 Mission St, San Francisco, CA, 94110. Phone: (415) 648-3600. Providers update this record themselves, so call before visiting.
How can I verify Marcellus Tin-Yau Chow, OD's license?
NPPES lists California license number 12033T, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Marcellus Tin-Yau Chow, OD prescribe under Medicare Part D?
In 2024, Marcellus Tin-Yau Chow, OD had 394 Medicare Part D claims for 114 beneficiaries; the average among optometrist prescribers was 277. 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.