Doctor profile · Federal record
Dr. Gregory Grzesik, D.O.
Hospitalist Physician (CMS: Hospitalist) · Internal Medicine Physician · Internal Medicine Physician · Weston, WI
- NPI 1316389372
- Accepts Medicare
- MIPS 84.6 / 100 · 2023
- 13 yrs in practice
- Licensed in 2 states
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
3400 Ministry Pkwy
Weston, WI 544765220
(715) 393-1220 - Additional location
-
2251 N Shore Dr
Rhinelander, WI 545016710
(715) 361-4700 - Mailing address
-
1000 N Oak Ave
Marshfield, WI 544495702
Credentials & registration
- NPI registered
- July 2013 — 13 yrs on file
- Profile last updated
- June 18, 2025
- Year of graduation
- 2013 — 13 yrs since
- Specialty taxonomy
- 208M00000X — NUCC code
- State licenses (3)
- Wisconsin #65797 · Wisconsin #65797-21 · Illinois #125-062888
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1316389372. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
372
Distinct HCPCS
4
Medicare allowed
$30,091
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 239 | 86 | $74 | |
99239 |
Hospital discharge day management, more than 30 minutes | 62 | 59 | $107 | |
99231 |
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes | 39 | 15 | $46 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 32 | 32 | $122 |
In context: peer comparison
Among 6 peers in Weston Hospitalist Physician, average services per provider: 92. This provider delivers 4.0× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
39
Patients
0
Total drug cost
$260
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Furosemide | Generic | 17 | 0 | $98 |
| Atorvastatin Calcium | Generic | 11 | 0 | $87 |
| Metoprolol Tartrate | Generic | 11 | 0 | $76 |
Frequently asked questions
What is Dr. Gregory Grzesik's medical specialty?
Dr. Gregory Grzesik practices Hospitalist Physician in Weston, WI.
Where does Dr. Gregory Grzesik practice?
Dr. Gregory Grzesik practices at 3400 Ministry Pkwy, Weston, WI 544765220. Office phone: 7153931220.
What is Dr. Gregory Grzesik's NPI?
Dr. Gregory Grzesik's National Provider Identifier (NPI) is 1316389372, issued by NPPES.
Does Dr. Gregory Grzesik accept Medicare assignment?
Yes. Dr. Gregory Grzesik accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Gregory Grzesik commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239); Subsequent hospital care with straightforward or low level of medical decision making (HCPCS 99231). Source: CMS Medicare Physician & Other Practitioners file.