Doctor profile · Federal record
Dr. William Tatomer, MD
Psychiatry Physician (CMS: Psychiatry) · San Mateo, CA
- NPI 1104862689
- 55 yrs in practice
- Male
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
101 S San Mateo Dr, Suite 300
San Mateo, CA 944013819
(650) 342-4442
fax (650) 342-8816
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- April 16, 2010
- Year of graduation
- 1971 — 55 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- California #C35537
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1104862689. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
547
Distinct HCPCS
2
Medicare allowed
$43,217
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
90836 |
Psychotherapy with evaluation and management visit, 45 minutes | 274 | 41 | $93 | |
99212 |
Established patient office or other outpatient visit, 10-19 minutes | 273 | 41 | $65 |
In context: peer comparison
Among 8 peers in this city , average services per provider: 82. This provider delivers 6.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
267
Patients
0
Total drug cost
$52,706
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Clonazepam | Generic | 35 | 0 | $302 |
| Sertraline Hcl | Generic | 35 | 0 | $288 |
| Escitalopram Oxalate | Generic | 33 | 0 | $745 |
| Trazodone Hcl | Generic | 32 | 0 | $377 |
| Fluoxetine Hcl | Generic | 21 | 0 | $213 |
| Vraylar (Cariprazine Hcl) | Brand | 20 | 0 | $44,499 |
| Lamotrigine | Generic | 19 | 0 | $101 |
| Venlafaxine Hcl Er (Venlafaxine Hcl) | Brand | 15 | 0 | $916 |
| Alprazolam Er (Alprazolam) | Brand | 12 | 0 | $281 |
| Gabapentin | Generic | 12 | 0 | $554 |
Frequently asked questions
What is Dr. William Tatomer's medical specialty?
Dr. William Tatomer practices Psychiatry Physician in San Mateo, CA.
Where does Dr. William Tatomer practice?
Dr. William Tatomer practices at 101 S San Mateo Dr, San Mateo, CA 944013819. Office phone: 6503424442.
What is Dr. William Tatomer's NPI?
Dr. William Tatomer's National Provider Identifier (NPI) is 1104862689, issued by NPPES.
Does Dr. William Tatomer accept Medicare assignment?
Dr. William Tatomer does not accept Medicare assignment for all services. Patients may be billed amounts beyond Medicare-allowed charges.
What procedures does Dr. William Tatomer commonly perform?
Top Medicare-reported procedures in 2023: Psychotherapy with evaluation and management visit (HCPCS 90836); Established patient office or other outpatient visit (HCPCS 99212). Source: CMS Medicare Physician & Other Practitioners file.