Gregory Zimmerman, MD
NPI 1174769939 · Family Medicine Physician · Greenfield, WI
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Zimmerman, MD is a Family Medicine Physician provider in Greenfield, WI (NPI 1174769939).
Provider details
- NPI number
- 1174769939
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 105193 (MN)
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
17 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
398 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) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 191 | $85 |
| New Patient Office Or Other Outpatient Visit With Low Level of Medical Decision Making, If Using Time, 30 Minutes Or More99203 | 44 | $104 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 38 | $16 |
| Detection Test By Immunoassay Technique for Severe Acute Respiratory Syndrome Coronavirus87426 | 34 | $35 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 28 | $120 |
| X-Ray of Chest, 2 Views71046 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 8 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Prednisone | 91 | 90 |
| Amoxicillin/Potassium Clavbrand: Amoxicillin-Clavulanate Potass | 48 | 48 |
| Doxycycline Hyclate | 46 | 46 |
| Cephalexin | 42 | 41 |
| Azithromycin | 29 | 29 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 29 | 29 |
| Sulfamethoxazole/Trimethoprimbrand: Sulfamethoxazole-Trimethoprim | 25 |
Practice location
Mailing address
Additional practice locations (1)
- 13900 W National AveNew Berlin, WI 53151-9515Phone: (262) 928-4500Fax: (262) 928-4550
Registry dates
- Enumerated
- 2008-12-29
- Last updated
- 2024-12-02
- Certified
- 2024-12-02
Frequently asked questions
- What is Gregory Zimmerman's NPI number?
- Gregory Zimmerman's National Provider Identifier (NPI) is 1174769939, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Zimmerman's specialty?
- Gregory Zimmerman is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Zimmerman located?
- Gregory Zimmerman's practice location on file with NPPES is 6901 W Edgerton Ave, Greenfield, WI 53220-4420.
- What is Gregory Zimmerman's phone number?
- The practice phone number listed in the NPPES registry for Gregory Zimmerman is (414) 325-5244.
- Does Gregory Zimmerman accept Medicare?
- Gregory Zimmerman is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Zimmerman's NPI active?
- Yes — Gregory Zimmerman's NPI (1174769939) is active in the NPPES registry as of the last update on 2024-12-02.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.