Leonard Walter Ostrowski, M.D.
Family Medicine Physician · Portage, IN
Leonard Walter Ostrowski, M.D. is a family medicine physician with a practice address in Portage, Indiana, and NPI 1881691947, issued on Jul 5, 2005. Check the license (Indiana 01033961, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Leonard Walter Ostrowski
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 01033961 IN
Self-reported in NPPES; status is on the state search - Practice location
- 3125 Willowcreek RD, Portage, IN 46368
- Phone
- (219) 762-3175
- Enumerated
- Jul 5, 2005
- Record last updated
- Sep 14, 2020 (not updated in 6 years: call before relying on the address or phone)
- Fax
- (219) 763-3092
- Medicaid ID
- 100353010 IN
- Medicare enrollment
- Enrolled (PECOS I20040827000242); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,506 in Indiana → Look up another NPI →
Also registered at 3125 Willowcreek RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Leonard Walter Ostrowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01033961Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average family medicine physician in 2024
12,191 Medicare Part D claims for 953 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 109 claims were for opioids.
Most prescribed
- Losartan Potassium603 claims
- Amlodipine Besylate509 claims
- Levothyroxine Sodium505 claims
- Atorvastatin Calcium502 claims
- Rosuvastatin Calcium415 claims
- Lisinopril301 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: $739.20
38 payments; by number, the most common kind was food and beverage; the largest payer was Novo Nordisk Inc. The 55,478 providers of this specialty with any payment received $902.55 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 5 group practices
- Chesterton Physical Therapy IncChesterton, IN
- Northshore Health Centers IncPortage, IN
- Porter Physician Services LLCValparaiso, IN
- Rci (wrs) LLCValparaiso, IN
- Select Rehabilitation, LLCGlenview, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Leonard Walter Ostrowski among 3,506 family medicine physician records in Indiana
Leonard Walter Ostrowski, M.D. is one of 3,506 family medicine physician records with a practice address in Indiana. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 81% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1982 · median 2005 among the 2,196 with a school on file
- Record last updated2020 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a Indiana practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
19 family medicine physician records list a practice address in Portage
They are 19 of the 423 NPPES records with a practice address in Portage, and 3,506 family medicine physician records in Indiana.
All 3,506 in Indiana → Every provider in Portage → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Andi Arnautovic, MDPortage, IN 463681487795118
- Adrienne Baksinski, D.O.Portage, IN 463681033272323
- Luis Barajas, MDPortage, IN 463681548260680
- Shane Bush, M.D.Portage, IN 463681316258874
- Donald Dunevant, MDPortage, IN 463681821059148
- Manjeet Geeta, M.D.Portage, IN 463681811949035
- Stephen Headley, D.O.Portage, IN 463681679663603
- Jill Hollowell, DOPortage, IN 463681639249048
Common questions
What is Leonard Walter Ostrowski, M.D.'s NPI number?
Leonard Walter Ostrowski, M.D.'s National Provider Identifier (NPI) is 1881691947, issued on Jul 5, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Leonard Walter Ostrowski, M.D. located?
The NPPES record lists a practice address at 3125 Willowcreek RD, Portage, IN, 46368. Phone: (219) 762-3175. Providers update this record themselves, so call before visiting.
How can I verify Leonard Walter Ostrowski, M.D.'s license?
NPPES lists Indiana license number 01033961, 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 Leonard Walter Ostrowski, M.D. prescribe under Medicare Part D?
In 2024, Leonard Walter Ostrowski, M.D. had 12,191 Medicare Part D claims for 953 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
What is Leonard Walter Ostrowski, M.D.'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.