DR. ANNA CHANG M.D.
NPI 1942313770
Internal Medicine - Geriatric Medicine in San Francisco, CA
About Dr. Anna Chang M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ANNA CHANG M.D. (NPI 1942313770) is an individual geriatric medicine provider in San Francisco, California, licensed in California (A76848) and active in the NPI registry since August 2006. She is enrolled in Medicare PECOS.
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 (PECOS)
Dr. Anna Chang M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show Anna Chang reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 2,112 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 94121 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94121
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 Anna Chang's NPI number?
The NPI number for Anna Chang is 1942313770. It was assigned to this individual provider in the NPPES registry on August 16, 2006.
Where is Anna Chang located?
Anna Chang practices at 4150 Clement St Box 181G, San Francisco, CA 94121. The listed phone number is (415) 221-4810.
What is Anna Chang's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is Anna Chang enrolled in Medicare?
Yes. Anna Chang is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Anna Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Anna Chang reassigns Medicare benefits to 3 organizations: Ucsf Medical Group Business Services (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Regents Of The University Of California (San Francisco, CA). Each 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 Anna Chang'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 Anna Chang was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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. Anna Chang, M.D. · NPI 1942313770
Geriatric Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since August 16, 2006.
## Identity
- **NPI:** 1942313770 (Entity type: Individual)
- **Enumerated:** August 16, 2006
- **Primary specialty:** Internal Medicine - Geriatric Medicine · taxonomy 207RG0300X
- **State license:** A76848 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 4150 CLEMENT ST, BOX 181G, San Francisco, CA 94121-1545
- **Phone:** (415) 221-4810
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); University Of California San Francisco (NPI 1164512851, San Francisco, CA); Regents Of The University Of California (NPI 1376613943, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** July 8, 2007
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Source: [NPI Profile](https://npiprofile.com/npi/1942313770) · Data from the CMS NPPES public registry.