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 .

NPPES Updated May 11, 2026
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

NPPES · NUCC
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

OIG LEIE Updated May 11, 2026

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

CMS Provider Utilization
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 this city , average services per provider: 92. This provider delivers 4.0× the peer median.

Medicare Part D · 2023

Top prescriptions

CMS Part D Prescriber
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

Methodology · sources used on this page

All figures on this page come from publicly available federal datasets. We do not edit, score, or summarise the underlying data. Profile generated May 17, 2026.

NPPES Provider identifiers and practice info May 11, 2026
Open Payments Industry payments to providers (Sunshine Act) May 11, 2026
Medicare Procedure Utilization Services and allowed amounts by HCPCS May 11, 2026
Medicare Part D Prescription drug claims May 11, 2026
CMS MIPS Quality performance scores May 11, 2026
OIG LEIE Federal exclusion / sanctions list May 11, 2026

Information based on publicly available federal data. Not medical advice. Report incorrect data ›