Gregory Reiser, MD
NPI 1245250323 · Cardiovascular Disease Physician · Oshkosh, WI
Enrolled with Medicare as Practitioner - Cardiovascular Disease (cardiology) · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Reiser, MD is a Cardiovascular Disease Physician provider in Oshkosh, WI (NPI 1245250323).
Provider details
- NPI number
- 1245250323
- Entity type
- Individual
- Primary specialty
- Cardiovascular Disease PhysicianAllopathic & Osteopathic Physicians
- Credential
- MD
- Sex
- Male
- Sole proprietor
- No
- License
- 27306-020 (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
19 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
254 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 Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 147 | $117 |
| Routine Electrocardiogram (ecg) Using at Least 12 Leads With Interpretation and Report93000 | 64 | $13 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 43 | $156 |
Typical Medicare-allowed amounts for these services range $13–$156 (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 · 27 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Metoprolol Succinate | 254 | 90 |
| Furosemide | 174 | 58 |
| Apixabanbrand: Eliquis | 122 | 40 |
| Losartan Potassium | 92 | 37 |
| Atorvastatin Calcium | 83 | 29 |
| Spironolactone | 75 | 27 |
| Sacubitril/Valsartanbrand: Entresto |
Practice location
Mailing address
Additional practice locations (1)
- 2801 W Kinnickinnic River PkwySuite 777Milwaukee, WI 53215-3669Phone: (414) 649-3370Fax: (414) 649-3278
Registry dates
- Enumerated
- 2006-07-20
- Last updated
- 2023-10-16
- Certified
- 2023-10-16
Frequently asked questions
- What is Gregory Reiser's NPI number?
- Gregory Reiser's National Provider Identifier (NPI) is 1245250323, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Reiser's specialty?
- Gregory Reiser is listed in the NPPES registry with a primary specialty of Cardiovascular Disease Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Reiser located?
- Gregory Reiser's practice location on file with NPPES is 855 N Westhaven Dr, Oshkosh, WI 54904-7668.
- What is Gregory Reiser's phone number?
- The practice phone number listed in the NPPES registry for Gregory Reiser is (920) 303-8700.
- Does Gregory Reiser accept Medicare?
- Gregory Reiser is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Reiser's NPI active?
- Yes — Gregory Reiser's NPI (1245250323) is active in the NPPES registry as of the last update on 2023-10-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.