Doctor profile · Federal record
Dr. John Ernzen, MD
Psychiatry Physician (CMS: Psychiatry) · Student in an Organized Health Care Education/Training Program · Chicago, IL
- NPI 1346615663
- Accepts Medicare
- 7 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 4 locations .
- Primary practice
-
225 E Chicago Ave
Chicago, IL 606112991
(312) 227-4000 - Additional location
-
1740 W Taylor St
Chicago, IL 606127232
(866) 600-2273 - Additional location
-
240 E Huron St, Suite 1-200
Chicago, IL 606112909
(312) 503-7975 - Additional location
-
2650 Ridge Ave., Department of Psychiatry
Evanston, IL 602011718
(847) 570-2540
fax (847) 570-2939 - Mailing address
-
Ann & Robert H. Lurie Children's Hospital of Chicago, 225 E. Chicago Ave
Chicago, IL 60611
Show 1 more location
Credentials & registration
- NPI registered
- December 2015 — 11 yrs on file
- Profile last updated
- May 27, 2022
- Year of graduation
- 2019 — 7 yrs since
- Specialty taxonomy
- 2084P0800X — NUCC code
- State license (1)
- Illinois #036157705
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1346615663. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
41
Distinct HCPCS
1
Medicare allowed
$3,405
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 41 | 26 | $83 |
In context: peer comparison
Among 81 peers in Chicago Psychiatry Physician, average services per provider: 102. This provider delivers 0.4× the peer median.Frequently asked questions
What is Dr. John Ernzen's medical specialty?
Dr. John Ernzen practices Psychiatry Physician in Chicago, IL.
Where does Dr. John Ernzen practice?
Dr. John Ernzen practices at 225 E Chicago Ave, Chicago, IL 606112991. Office phone: 3122274000.
What is Dr. John Ernzen's NPI?
Dr. John Ernzen's National Provider Identifier (NPI) is 1346615663, issued by NPPES.
Does Dr. John Ernzen accept Medicare assignment?
Yes. Dr. John Ernzen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. John Ernzen commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232). Source: CMS Medicare Physician & Other Practitioners file.