DR. GRACE GYUNGAH AHN M.D.
NPI 1194923813
Emergency Medicine in San Francisco, CA
About Dr. Grace Gyungah Ahn M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. GRACE GYUNGAH AHN M.D. (NPI 1194923813) is an individual emergency medicine provider in San Francisco, California, licensed in California (A100922) and active in the NPI registry since July 2007. She is enrolled in Medicare PECOS and is a graduate of University Of Michigan Medical School (2006).
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. Grace Gyungah Ahn M.d. 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 Grace Ahn 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.
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 Grace Ahn's NPI number?
The NPI number for Grace Ahn is 1194923813. It was assigned to this individual provider in the NPPES registry on July 3, 2007.
Where is Grace Ahn located?
Grace Ahn practices at 1001 Potrero Ave Ste 1e21, San Francisco, CA 94110. The listed phone number is (415) 206-8111.
What is Grace Ahn's specialty?
The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.
Is Grace Ahn enrolled in Medicare?
Yes. Grace Ahn 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 Grace Ahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Grace Ahn 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 Grace Ahn'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 Grace Ahn was last updated on December 13, 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. Grace Gyungah Ahn, M.D. · NPI 1194923813
Emergency Medicine physician in San Francisco, California. Individual provider, active in the CMS NPPES registry since July 3, 2007.
## Identity
- **NPI:** 1194923813 (Entity type: Individual)
- **Enumerated:** July 3, 2007
- **Primary specialty:** Emergency Medicine · taxonomy 207P00000X
- **State license:** A100922 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 1001 POTRERO AVE STE 1E21, San Francisco, CA 94110-3518
- **Phone:** (415) 206-8111
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **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 Michigan Medical School, class of 2006
## Record status
- **NPPES last updated:** December 13, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1194923813) · Data from the CMS NPPES public registry.