DR. MARCELLUS TIN-YAU CHOW OD
NPI 1194890012
Optometrist in San Francisco, CA
About Dr. Marcellus Tin-yau Chow Od NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARCELLUS TIN-YAU CHOW OD (NPI 1194890012) is an individual optometrist in San Francisco, California, licensed in California (12033T) and active in the NPI registry since November 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California - School Of Optometry (1998).
NPPES Registry Identity
Specialties & Licenses
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Marcellus Tin-yau Chow Od is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show Marcellus Chow reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
San Francisco, CA 94116
- Reassigned Medicare billing, California enrollment
- 20,078 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94110 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 2
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Marcellus Chow's NPI number?
The NPI number for Marcellus Chow is 1194890012. It was assigned to this individual provider in the NPPES registry on November 24, 2006.
Where is Marcellus Chow located?
Marcellus Chow practices at 3201 Mission St, San Francisco, CA 94110. The listed phone number is (415) 648-3600.
What is Marcellus Chow's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Marcellus Chow enrolled in Medicare?
Yes. Marcellus Chow is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for Marcellus Chow's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Marcellus Chow reassigns Medicare benefits to Permanente Medical Group Inc (San Francisco, CA). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Marcellus Chow's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Marcellus Chow was last updated on December 30, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. Marcellus Tin-Yau Chow, OD · NPI 1194890012
Optometrist provider in San Francisco, California. Individual provider, active in the CMS NPPES registry since November 24, 2006.
## Identity
- **NPI:** 1194890012 (Entity type: Individual)
- **Enumerated:** November 24, 2006
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 12033T (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 3201 MISSION ST, San Francisco, CA 94110-5006
- **Phone:** (415) 648-3600 · **Fax:** (415) 648-0719
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** Permanente Medical Group Inc (NPI 1841373800, San Francisco, CA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California - School Of Optometry, class of 1998
## Record status
- **NPPES last updated:** December 30, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1194890012) · Data from the CMS NPPES public registry.