Doctor profile · Federal record
Dr. Derek Timmermann, M.D.
Emergency Medicine Physician (CMS: Emergency Medicine) · Rockford, IL
- NPI 1649213141
- Accepts Medicare
- MIPS 98.4 / 100 · 2023
- 26 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
5666 E State St, Emergency Department
Rockford, IL 611082425
(815) 395-5189
Credentials & registration
- NPI registered
- June 2006 — 20 yrs on file
- Profile last updated
- August 31, 2012
- Year of graduation
- 2000 — 26 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- Illinois #036.118970
- Medicaid
- CA #WA91176B
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1649213141. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
666
Distinct HCPCS
4
Medicare allowed
$110,110
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 523 | 483 | $175 | |
99284 |
Emergency department visit with moderate level of medical decision making | 80 | 77 | $120 | |
99291 |
Critical care, first 30-74 minutes | 42 | 42 | $210 | |
93042 |
Electrocardiogram (ecg) 1 to 3 leads with review by physician only | 21 | 21 | $7 |
In context: peer comparison
Among 18 peers in this city , average services per provider: 111. This provider delivers 6.0× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
188
Patients
184
Total drug cost
$919
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 51 | 51 | $325 |
| Prednisone | Generic | 33 | 31 | $57 |
| Tramadol Hcl | Generic | 23 | 23 | $49 |
| Cephalexin | Generic | 21 | 21 | $146 |
| Lorazepam | Generic | 16 | 16 | $58 |
| Ondansetron Odt (Ondansetron) | Brand | 16 | 15 | $76 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 14 | 14 | $139 |
| Meclizine Hcl | Generic | 14 | 13 | $70 |
Hospital affiliations
Frequently asked questions
What is Dr. Derek Timmermann's medical specialty?
Dr. Derek Timmermann practices Emergency Medicine Physician in Rockford, IL.
Where does Dr. Derek Timmermann practice?
Dr. Derek Timmermann practices at 5666 E State St, Rockford, IL 611082425. Office phone: 8153955189.
What is Dr. Derek Timmermann's NPI?
Dr. Derek Timmermann's National Provider Identifier (NPI) is 1649213141, issued by NPPES.
Does Dr. Derek Timmermann accept Medicare assignment?
Yes. Dr. Derek Timmermann accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Derek Timmermann commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with high level of medical decision making (HCPCS 99285); Emergency department visit with moderate level of medical decision making (HCPCS 99284); Critical care (HCPCS 99291). Source: CMS Medicare Physician & Other Practitioners file.