Doctor profile · Federal record
Dr. William Clark, M.D.
Psychiatry Physician (CMS: Psychiatry) · Chicago, IL
- NPI 1578574000
- 40 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
737 N Michigan Ave, Suite 1200
Chicago, IL 60611
(312) 373-7300
fax (312) 573-1249
Credentials & registration
- NPI registered
- August 2006 — 20 yrs on file
- Profile last updated
- July 13, 2010
- Year of graduation
- 1986 — 40 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Illinois #336 040184
- Medicaid
- IL #0360770
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1578574000. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
911
Distinct HCPCS
3
Medicare allowed
$75,174
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 456 | 93 | $90 | |
90833 |
Psychotherapy with evaluation and management visit, 30 minutes | 265 | 74 | $68 | |
90836 |
Psychotherapy with evaluation and management visit, 45 minutes | 190 | 26 | $86 |
In context: peer comparison
Among 81 peers in Chicago Psychiatry Physician, average services per provider: 102. This provider delivers 8.9× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
925
Patients
146
Total drug cost
$38,113
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Alprazolam | Generic | 119 | 22 | $1,274 |
| Escitalopram Oxalate | Generic | 117 | 29 | $1,812 |
| Clonazepam | Generic | 106 | 19 | $1,269 |
| Bupropion Xl (Bupropion Hcl) | Brand | 86 | 12 | $1,914 |
| Lamotrigine | Generic | 77 | 13 | $1,141 |
| Sertraline Hcl | Generic | 67 | 15 | $949 |
| Fluoxetine Hcl | Generic | 65 | 0 | $1,279 |
| Dextroamphetamine-Amphetamine (Dextroamphetamine/Amphetamine) | Brand | 63 | 13 | $2,011 |
| Trazodone Hcl | Generic | 51 | 12 | $1,218 |
| Duloxetine Hcl | Generic | 45 | 11 | $1,791 |
Frequently asked questions
What is Dr. William Clark's medical specialty?
Dr. William Clark practices Psychiatry Physician in Chicago, IL.
Where does Dr. William Clark practice?
Dr. William Clark practices at 737 N Michigan Ave, Chicago, IL 60611. Office phone: 3123737300.
What is Dr. William Clark's NPI?
Dr. William Clark's National Provider Identifier (NPI) is 1578574000, issued by NPPES.
Does Dr. William Clark accept Medicare assignment?
Dr. William Clark does not accept Medicare assignment for all services. Patients may be billed amounts beyond Medicare-allowed charges.
What procedures does Dr. William Clark commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99213); Psychotherapy with evaluation and management visit (HCPCS 90833); Psychotherapy with evaluation and management visit (HCPCS 90836). Source: CMS Medicare Physician & Other Practitioners file.