Doctor profile · Federal record
Dr. Daniel Grzegorek, D.O.
Internal Medicine Physician (CMS: Internal Medicine) · Willowbrook, IL
- NPI 1487651337
- Accepts Medicare
- 34 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
6733 Kingery Hwy
Willowbrook, IL 605275142
(630) 325-4049 - Mailing address
-
Po Box 713260
Chicago, IL 606771260
Credentials & registration
- NPI registered
- July 2005 — 21 yrs on file
- Profile last updated
- August 8, 2023
- Year of graduation
- 1992 — 34 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- Illinois #036-089211
- Medicaid
- IL #036089211
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1487651337. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
4,918
Distinct HCPCS
10
Medicare allowed
$318,251
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99308 |
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, at least 15 minutes | 549 | 213 | $77 | |
36415 |
Insertion of needle into vein for collection of blood sample | 520 | 328 | $8 | |
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 491 | 285 | $133 | |
80053 |
Blood test, comprehensive group of blood chemicals | 417 | 310 | $10 | |
84443 |
Blood test, thyroid stimulating hormone (tsh) | 330 | 288 | $16 | |
80061 |
Blood test, lipids (cholesterol and triglycerides) | 317 | 282 | $13 | |
99306 |
Initial nursing facility care with high level of medical decision making, per day, if using time, at least 45 minutes | 316 | 279 | $187 | |
99309 |
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes | 306 | 168 | $110 | |
85025 |
Complete blood cell count (red cells, white blood cell, platelets), automated test and automated differential white blood cell count | 288 | 259 | $8 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 283 | 283 | $133 |
In context: peer comparison
Among 2 peers in Willowbrook Internal Medicine Physician, average services per provider: 119. This provider delivers 41× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
4,505
Patients
1,287
Total drug cost
$187,857
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 685 | 198 | $9,757 |
| Levothyroxine Sodium | Generic | 552 | 153 | $9,719 |
| Amlodipine Besylate | Generic | 398 | 114 | $4,290 |
| Simvastatin | Generic | 344 | 94 | $3,929 |
| Lisinopril | Generic | 298 | 90 | $3,404 |
| Losartan Potassium | Generic | 292 | 80 | $4,138 |
| Metformin Hcl | Generic | 266 | 82 | $2,701 |
| Eliquis (Apixaban) | Brand | 257 | 53 | $128,944 |
| Gabapentin | Generic | 249 | 81 | $4,061 |
| Metoprolol Succinate | Generic | 222 | 72 | $3,960 |
Frequently asked questions
What is Dr. Daniel Grzegorek's medical specialty?
Dr. Daniel Grzegorek practices Internal Medicine Physician in Willowbrook, IL.
Where does Dr. Daniel Grzegorek practice?
Dr. Daniel Grzegorek practices at 6733 Kingery Hwy, Willowbrook, IL 605275142. Office phone: 6303254049.
What is Dr. Daniel Grzegorek's NPI?
Dr. Daniel Grzegorek's National Provider Identifier (NPI) is 1487651337, issued by NPPES.
Does Dr. Daniel Grzegorek accept Medicare assignment?
Yes. Dr. Daniel Grzegorek accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Daniel Grzegorek commonly perform?
Top Medicare-reported procedures in 2023: Subsequent nursing facility care with straightforward level of medical decision making (HCPCS 99308); Insertion of needle into vein for collection of blood sample (HCPCS 36415); Established patient office or other outpatient visit (HCPCS 99214). Source: CMS Medicare Physician & Other Practitioners file.