Gregory Haase, DO
NPI 1851357032 · Internal Medicine Physician · Warsaw, IN
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gregory Haase, DO is a Internal Medicine Physician provider in Warsaw, IN (NPI 1851357032).
Provider details
- NPI number
- 1851357032
- Entity type
- Individual
- Primary specialty
- Internal Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- DO
- Sex
- Male
- Sole proprietor
- No
- License
- 02000857A (IN)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
20 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)25% of score
2,528 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
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 .
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 | 1,243 | $118 |
| Insertion of Needle Into Vein for Collection of Blood Sample36415 | 697 | $9 |
| Annual Wellness Visit, Includes a Personalized Prevention Plan of Service (pps), Subsequent VisitG0439 | 130 | $122 |
| Injection of Drug Or Substance Under Skin Or Into Muscle96372 | 114 | $13 |
| New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204 | 52 | $154 |
| Administration of Influenza Virus VaccineG0008 | 47 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 216 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Levothyroxine Sodium | 832 | 227 |
| Amlodipine Besylate | 659 | 173 |
| Atorvastatin Calcium | 633 | 187 |
| Metoprolol Succinate | 560 | 162 |
| Losartan Potassium | 540 | 165 |
| Rosuvastatin Calcium | 446 | 130 |
| Gabapentin |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$16 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-04-25
- Last updated
- 2026-04-06
- Certified
- 2026-04-06
Frequently asked questions
- What is Gregory Haase's NPI number?
- Gregory Haase's National Provider Identifier (NPI) is 1851357032, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gregory Haase's specialty?
- Gregory Haase is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gregory Haase located?
- Gregory Haase's practice location on file with NPPES is 355 E 200 N, Warsaw, IN 46582-7855.
- What is Gregory Haase's phone number?
- The practice phone number listed in the NPPES registry for Gregory Haase is (574) 372-5625.
- Does Gregory Haase accept Medicare?
- Gregory Haase is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gregory Haase's NPI active?
- Yes — Gregory Haase's NPI (1851357032) is active in the NPPES registry as of the last update on 2026-04-06.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.