DR. ALLISON RO-YAO TZENG MD
NPI 1205575487
Internal Medicine in San Francisco, CA
About Dr. Allison Ro-yao Tzeng Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ALLISON RO-YAO TZENG MD (NPI 1205575487) is an individual internal medicine provider in San Francisco, California, licensed in California (A203094) and active in the NPI registry since June 2022. She is enrolled in Medicare PECOS, maintains a secondary practice location in Philadelphia, and is a graduate of University Of Vermont College Of Medicine (2022).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
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. Allison Ro-yao Tzeng Md 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 Reassignments
3Medicare enrollment records show Allison Tzeng 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 94143
- Reassigned Medicare billing, California enrollment
- 2,112 clinicians in this Medicare group
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 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 94143 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 94143
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 Allison Tzeng's NPI number?
The NPI number for Allison Tzeng is 1205575487. It was assigned to this individual provider in the NPPES registry on June 3, 2022.
Where is Allison Tzeng located?
Allison Tzeng practices at 521 Parnassus Ave, San Francisco, CA 94143. The listed phone number is (415) 476-1000.
What is Allison Tzeng's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Allison Tzeng enrolled in Medicare?
Yes. Allison Tzeng 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 organizations bill Medicare for Allison Tzeng's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Allison Tzeng reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (San Francisco, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (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 Allison Tzeng'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 Allison Tzeng was last updated on June 10, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 months 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. Allison Ro-Yao Tzeng, MD · NPI 1205575487
Internal Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since June 3, 2022.
## Identity
- **NPI:** 1205575487 (Entity type: Individual)
- **Enumerated:** June 3, 2022
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** A203094 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 521 PARNASSUS AVE, San Francisco, CA 94143-2206
- **Phone:** (415) 476-1000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Regents Of The University Of California (NPI 1376613943, San Francisco, CA); University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Vermont College Of Medicine, class of 2022
## Record status
- **NPPES last updated:** June 10, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1205575487) · Data from the CMS NPPES public registry.