Gregory N. Haase, DO
Internal Medicine Physician · Warsaw, IN
Gregory N. Haase, DO is an internal medicine physician with a practice address in Warsaw, Indiana, and NPI 1851357032, issued on Apr 25, 2006. Check the license (Indiana 02000857A, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Gregory N. Haase
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 02000857A IN
Self-reported in NPPES; status is on the state search - Practice location
- 355 E 200 N, Warsaw, IN 46582
- Phone
- (574) 372-5625
- Enumerated
- Apr 25, 2006
- Record last updated
- Jul 14, 2026
- Fax
- (574) 372-5626
- Medicaid ID
- 100158930 IN
- Medicare enrollment
- Enrolled (PECOS I20070613000550); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,109 in Indiana → Look up another NPI →
Also registered at 355 E 200 N
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Laura NewmanNurse Practitioner1265947584
Verify Gregory N. Haase in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 02000857ACheck the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5.9 times the Medicare Part D claims of the average internal medicine physician in 2024
18,669 Medicare Part D claims for 984 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims.
Most prescribed
- Levothyroxine Sodium832 claims
- Amlodipine Besylate659 claims
- Atorvastatin Calcium633 claims
- Metoprolol Succinate560 claims
- Losartan Potassium540 claims
- Rosuvastatin Calcium446 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 88 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $15.64
1 payment: food and beverage; the largest payer was Pfizer Inc. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Parkview Health System IncAlbion, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gregory N. Haase among 2,109 internal medicine physician records in Indiana
Gregory N. Haase, DO is one of 2,109 internal medicine physician records with a practice address in Indiana. 85% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 54% newer
- In a Medicare fileYes · 85% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1981 · median 2005 among the 1,448 with a school on file
- Record last updated2026 · 43% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
7 internal medicine physician records list a practice address in Warsaw
They are 7 of the 607 NPPES records with a practice address in Warsaw, and 2,109 internal medicine physician records in Indiana.
All 2,109 in Indiana → Every provider in Warsaw → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Dhananjay Bhavsar, M.D.Warsaw, IN 465801598798589
- Dana Coates, D.O.Warsaw, IN 465801447216213
- Luan Nguyen, MDWarsaw, IN 465801578529020
- Shilpa Raval, M.D.Warsaw, IN 465801154362929
- Olha Shea, MDWarsaw, IN 465801023755519
- Hung Vo, D.O.Warsaw, IN 465801639135155
- Sylvana Atallah, M.D.South Bend, IN 466011225235336
- Justin Chow, MDSouth Bend, IN 466011700899622
Common questions
What is Gregory N. Haase, DO's NPI number?
Gregory N. Haase, DO's National Provider Identifier (NPI) is 1851357032, issued on Apr 25, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory N. Haase, DO located?
The NPPES record lists a practice address at 355 E 200 N, Warsaw, IN, 46582. Phone: (574) 372-5625. Providers update this record themselves, so call before visiting.
How can I verify Gregory N. Haase, DO's license?
NPPES lists Indiana license number 02000857A, as entered by the provider. Search the Medical Licensing Board of Indiana at https://www.in.gov/pla/professions/physicians-home/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gregory N. Haase, DO prescribe under Medicare Part D?
In 2024, Gregory N. Haase, DO had 18,669 Medicare Part D claims for 984 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Gregory N. Haase, DO's MIPS final score?
The 2023 MIPS final score is 88 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.