Marcellus Chow, OD
NPI 1194890012 · Optometrist · San Francisco, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Marcellus Chow, OD is a Optometrist provider in San Francisco, CA (NPI 1194890012).
Provider details
- NPI number
- 1194890012
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Male
- Sole proprietor
- No
- License
- 12033T (CA)
Specialties & taxonomies
Eye and Vision Services Providers
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 · 6 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Latanoprost | 199 | 73 |
| Dorzolamide Hcl | 51 | 16 |
| Dorzolamide Hcl/Timolol Maleatbrand: Dorzolamide-Timolol | 31 | — |
| Timolol Maleate | 30 | — |
| Levobunolol Hcl | 23 | — |
| Cyclosporine | 15 | — |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means , never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$134 across 2 records (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
- 2006-11-24
- Last updated
- 2021-12-30
Frequently asked questions
- What is Marcellus Chow's NPI number?
- Marcellus Chow's National Provider Identifier (NPI) is 1194890012, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Marcellus Chow's specialty?
- Marcellus Chow is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Marcellus Chow located?
- Marcellus Chow's practice location on file with NPPES is 3201 Mission St, San Francisco, CA 94110-5006.
- What is Marcellus Chow's phone number?
- The practice phone number listed in the NPPES registry for Marcellus Chow is (415) 648-3600.
- Does Marcellus Chow accept Medicare?
- Marcellus Chow is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Marcellus Chow's NPI active?
- Yes — Marcellus Chow's NPI (1194890012) is active in the NPPES registry as of the last update on 2021-12-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.