Doctor profile · Federal record

Dr. Grace Ahn, M.D.

Emergency Medicine Physician (CMS: Emergency Medicine) · San Francisco, CA

  • NPI 1194923813
  • Accepts Medicare
  • 20 yrs in practice
  • Female
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
1001 Potrero Ave Ste 1E21
San Francisco, CA 941103518
(415) 206-8111
Mailing address
1425 S Main St
Walnut Creek, CA 945965318

Credentials & registration

NPPES · NUCC
NPI registered
July 2007 — 19 yrs on file
Profile last updated
December 13, 2021
Year of graduation
2006 — 20 yrs since
Specialty taxonomy
207P00000X — NUCC code
State license (1)
California #A100922

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1194923813. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
15
Distinct HCPCS
1
Medicare allowed
$1,942
HCPCS Description Services Patients Avg allowed
99284 Emergency department visit with moderate level of medical decision making 15 14 $129

In context: peer comparison

Among 87 peers in this city , average services per provider: 91. This provider delivers 0.2× the peer median.

Medicare Part D · 2023

Top prescriptions

CMS Part D Prescriber
Total claims
26
Patients
26
Total drug cost
$196
Drug Type Claims Patients Total cost
Ondansetron Odt (Ondansetron) Brand 15 15 $92
Doxycycline Monohydrate Generic 11 11 $104

Frequently asked questions

Auto-generated from federal data
What is Dr. Grace Ahn's medical specialty?
Dr. Grace Ahn practices Emergency Medicine Physician in San Francisco, CA.
Where does Dr. Grace Ahn practice?
Dr. Grace Ahn practices at 1001 Potrero Ave Ste 1E21, San Francisco, CA 941103518. Office phone: 4152068111.
What is Dr. Grace Ahn's NPI?
Dr. Grace Ahn's National Provider Identifier (NPI) is 1194923813, issued by NPPES.
Does Dr. Grace Ahn accept Medicare assignment?
Yes. Dr. Grace Ahn accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Grace Ahn commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with moderate level of medical decision making (HCPCS 99284). Source: CMS Medicare Physician & Other Practitioners file.