Gregory Grzesik, D.O.
NPI 1316389372 · Hospitalist Physician · Weston, WI
Enrolled with Medicare as Practitioner - Hospitalist · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Grzesik, D.O. is a Hospitalist Physician provider in Weston, WI (NPI 1316389372).
Provider details
- NPI number
- 1316389372
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 65797-21 (WI)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
12 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
190 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 134 | $73 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 36 | $107 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 20 | $121 |
Typical Medicare-allowed amounts for these services range $73–$121 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 11 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Ropinirole Hcl | 44 | — |
| Mirabegronbrand: Myrbetriq | 26 | — |
| Prednisone | 20 | 19 |
| Gabapentin | 18 | — |
| Levothyroxine Sodium | 16 | — |
| Furosemide | 16 | — |
| Carbamazepinebrand: Carbamazepine Er | 14 | — |
Practice location
Mailing address
Additional practice locations (1)
- 2251 N Shore DrRhinelander, WI 54501-6710Phone: (715) 361-4700
Registry dates
- Enumerated
- 2013-07-18
- Last updated
- 2025-06-18
- Certified
- 2025-06-18
Frequently asked questions
- What is Gregory Grzesik's NPI number?
- Gregory Grzesik's National Provider Identifier (NPI) is 1316389372, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Grzesik's specialty?
- Gregory Grzesik is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Grzesik located?
- Gregory Grzesik's practice location on file with NPPES is 3400 Ministry Pkwy, Weston, WI 54476-5220.
- What is Gregory Grzesik's phone number?
- The practice phone number listed in the NPPES registry for Gregory Grzesik is (715) 393-1220.
- Does Gregory Grzesik accept Medicare?
- Gregory Grzesik is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Grzesik's NPI active?
- Yes — Gregory Grzesik's NPI (1316389372) is active in the NPPES registry as of the last update on 2025-06-18.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.