Doctor profile · Federal record

Dr. Ann Williamson, APRN

Nurse Practitioner · Los Angeles, CA

  • NPI 1801316765
  • Accepts Medicare
  • MIPS 84.8 / 100 · 2023
  • 8 yrs in practice
  • Female
  • Group practice
  • No sanctions

Practice & contact

NPPES Updated May 11, 2026
Primary practice
757 Westwood Plz
Los Angeles, CA 900958358
(310) 562-4713

Credentials & registration

NPPES · NUCC
NPI registered
June 2017 — 9 yrs on file
Profile last updated
February 20, 2026
Year of graduation
2018 — 8 yrs since
Specialty taxonomy
363L00000X — NUCC code
State license (1)
California #21769

Federal sanctions & exclusions

OIG LEIE Updated May 11, 2026

No sanctions, exclusions or revocations on file

Checked against OIG LEIE on NPI 1801316765. Last verified May 11, 2026.

Medicare procedures · 2023

Top services delivered

CMS Provider Utilization
Total services
38
Distinct HCPCS
2
Medicare allowed
$3,186
HCPCS Description Services Patients Avg allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 24 17 $71
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 14 12 $106

In context: peer comparison

Among 42 peers in Los Angeles Nurse Practitioner, average services per provider: 508. This provider delivers 0.1× the peer median.

Hospital affiliations

CMS Hospital Compare

Frequently asked questions

Auto-generated from federal data
What is Dr. Ann Williamson's medical specialty?
Dr. Ann Williamson practices Nurse Practitioner in Los Angeles, CA.
Where does Dr. Ann Williamson practice?
Dr. Ann Williamson practices at 757 Westwood Plz, Los Angeles, CA 900958358. Office phone: 3105624713.
What is Dr. Ann Williamson's NPI?
Dr. Ann Williamson's National Provider Identifier (NPI) is 1801316765, issued by NPPES.
Does Dr. Ann Williamson accept Medicare assignment?
Yes. Dr. Ann Williamson accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Ann Williamson commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.