Doctor profile · Federal record
Dr. Nolan Williams
Psychiatry Physician · Napa, CA
- NPI 1811339641
- 13 yrs on file
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
1580 1St St
Napa, CA 945592841
(707) 258-8757 - Additional location
-
200 Hillmont Ave
Ventura, CA 930031647
(805) 652-6729 - Mailing address
-
Po Box 412
Green Mountain Falls, CO 808190412
Credentials & registration
- NPI registered
- July 2013 — 13 yrs on file
- Profile last updated
- November 17, 2025
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- California #A159440
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1811339641. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
102
Distinct HCPCS
1
Medicare allowed
$7,529
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99234 |
Initial hospital care with same-day admission and discharge with straightforward or low level of medical decision making, per day, if using time, at least 45 minutes | 102 | 17 | $74 |
In context: peer comparison
Among 12 peers in Napa Psychiatry Physician, average services per provider: 130. This provider delivers 0.8× the peer median.Open Payments
Industry payments received
All-time total
$163
Transactions
2
Manufacturers
2
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Boston Scientific Corporation | 1 | $119.10 | |
| Otsuka Pharmaceutical Development & Commercialization, INC. | 1 | $44.02 |
By nature of payment
Frequently asked questions
What is Dr. Nolan Williams's medical specialty?
Dr. Nolan Williams practices Psychiatry Physician in Napa, CA.
Where does Dr. Nolan Williams practice?
Dr. Nolan Williams practices at 1580 1St St, Napa, CA 945592841. Office phone: 7072588757.
What is Dr. Nolan Williams's NPI?
Dr. Nolan Williams's National Provider Identifier (NPI) is 1811339641, issued by NPPES.
What procedures does Dr. Nolan Williams commonly perform?
Top Medicare-reported procedures in 2023: Initial hospital care with same-day admission and discharge with straightforward or low level of medical decision making (HCPCS 99234). Source: CMS Medicare Physician & Other Practitioners file.