Doctor profile · Federal record
Dr. Diana Williams, FNP
Family Nurse Practitioner (CMS: Nurse Practitioner) · Los Alamitos, CA
- NPI 1174025886
- Accepts Medicare
- 9 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
4288 Katella Ave
Los Alamitos, CA 907203562
(562) 256-8514
fax (562) 296-8561 - Additional location
-
123 Atlantic Ave
Long Beach, CA 908025121
(562) 726-1383 - Additional location
-
4237 Atlantic Ave
Long Beach, CA 908072801
(562) 336-1656 - Mailing address
-
12923 Lefloss Ave
Norwalk, CA 906502548
Credentials & registration
- NPI registered
- March 2018 — 8 yrs on file
- Profile last updated
- April 5, 2018
- Year of graduation
- 2017 — 9 yrs since
- Specialty taxonomy
- 363LF0000X — NUCC code
- State license (1)
- California #95008594
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1174025886. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
17
Distinct HCPCS
1
Medicare allowed
$1,423
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 17 | 17 | $84 |
In context: peer comparison
Among 2 peers in Los Alamitos Family Nurse Practitioner, average services per provider: 31. This provider delivers 0.5× the peer median.Frequently asked questions
What is Dr. Diana Williams's medical specialty?
Dr. Diana Williams practices Family Nurse Practitioner in Los Alamitos, CA.
Where does Dr. Diana Williams practice?
Dr. Diana Williams practices at 4288 Katella Ave, Los Alamitos, CA 907203562. Office phone: 5622568514.
What is Dr. Diana Williams's NPI?
Dr. Diana Williams's National Provider Identifier (NPI) is 1174025886, issued by NPPES.
Does Dr. Diana Williams accept Medicare assignment?
Yes. Dr. Diana Williams accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Diana Williams commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.