Gregory N. Haase, DO
NPI 1851357032ActiveIndividual· Internal Medicine· Warsaw, IN
Internal Medicine (DO) with Parkview Health System Inc, practicing in Warsaw, Indiana. Their prescriptions cost Medicare Part D more than their services did: $2,615,308 for 18,669 claims, against $145,856 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 6 companies reporting payments in 2025, $173.23 in all, mostly food and beverage. Lists Goshen Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1851357032 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Apr 25, 2006 |
| Last updated in NPPES | Jul 14, 2026 |
| Certified by provider | Jul 14, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 02000857A | IN |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Internal Medicine (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 404 |
|---|---|
| Services billed | 3,008 across 45 procedure codes |
| Paid by Medicare | $145,856 |
Part D prescriptions in 2024
| Prescriptions (claims) | 18,669 · 44,349 30-day fills |
|---|---|
| Patients | 984 |
| Total drug cost | $2,615,308 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 1981 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Parkview Health System IncFort Wayne, IN · 1,377 clinicians
Hospital affiliations
- Goshen HospitalGoshen, IN
- Kosciusko Community HospitalWarsaw, IN
- Lutheran Hospital of IndianaFort Wayne, IN
- Parkview Regional Medical CenterFort Wayne, IN
- Parkview Whitley HospitalColumbia City, IN
Other facilities
- Adoration Home HealthHome health agency · Fort Wayne, IN
- Elara CaringHome health agency · Fort Wayne, IN
- Home Health Care Solutions LLCHome health agency · Mooresville, IN
Industry payments (Open Payments)
- 2025$173.23 · 10 payments from 6 companies
- 2024$15.64 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $58.33 | 3 |
| Astrazeneca Pharmaceuticals LP | $55.20 | 3 |
| Abbvie Inc. | $16.21 | 1 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $14.59 | 1 |
| Merck Sharp & Dohme LLC | $14.47 | 1 |
What the 2025 payments were for
- Food and Beverage$173.23 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine providers in Warsaw
- 1407960206
- 1598798589
- 1447216213
- 1578529020
- 1154362929
- 1023755519
- 1639135155