Karl Leo Ost, M.D.
Family Medicine Physician · Indianapolis, IN
Karl Leo Ost, M.D. is a family medicine physician with a practice address in Indianapolis, Indiana, and NPI 1942233358, issued on Jul 9, 2006. Check the license (Indiana 01063661, as entered in NPPES) on the Medical Licensing Board of Indiana; the Medicare figures below come from public CMS files.
- Name
- Karl Leo Ost
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 01063661 IN
Self-reported in NPPES; status is on the state search - Practice location
- 10122 E. 10TH Street, Indianapolis, IN 46229
- Phone
- (317) 355-5717
- Enumerated
- Jul 9, 2006
- Record last updated
- Jun 9, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (317) 355-3760
- Medicaid ID
- 200871800 IN
- Medicare enrollment
- Enrolled (PECOS I20070905000605); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 2004
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 3,506 in Indiana → Look up another NPI →
Also registered at 10122 E. 10TH Street
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Aria Arrizabalaga, MDFamily Medicine Physician1912971029
- Casandra Cashman, M.D.Family Medicine Physician1164656013
- Jesse Clark, DOFamily Medicine Physician1154642585
- Stephanie Nader, LCSWClinical Social Worker1316971963
Verify Karl Leo Ost in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Licensing Board of Indiana
Search for license 01063661Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
41 Medicare Part D claims for 25 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 44% of 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.
Bills Medicare through one group practice
- Community Physicians OF Indiana IncIndianapolis, IN
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Karl Leo Ost among 3,506 family medicine physician records in Indiana
Karl Leo Ost, 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 2006, is newer than 19% of them.
- NPI issued2006 · 19% of these records are older, 46% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated2004 · median 2005 among the 2,196 with a school on file
- Record last updated2021 · 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).
569 family medicine physician records list a practice address in Indianapolis
They are 569 of the 30,493 NPPES records with a practice address in Indianapolis, and 3,506 family medicine physician records in Indiana.
All 3,506 in Indiana → Every provider in Indianapolis → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Aria Arrizabalaga, MDIndianapolis, IN 462291912971029
- Robert Arthur, MDIndianapolis, IN 462291376531798
- David Breitwieser, MDIndianapolis, IN 462291083650741
- Lee Fischer, M.D.Indianapolis, IN 462291598747677
- Tricia Hern, MDIndianapolis, IN 462291427087170
- Farouk KhairyIndianapolis, IN 462291134143837
- Sagi Mathew, M.D.Indianapolis, IN 462291720044217
- Paul McDougal, MDIndianapolis, IN 462291275577314
Common questions
What is Karl Leo Ost, M.D.'s NPI number?
Karl Leo Ost, M.D.'s National Provider Identifier (NPI) is 1942233358, issued on Jul 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karl Leo Ost, M.D. located?
The NPPES record lists a practice address at 10122 E. 10TH Street, Indianapolis, IN, 46229. Phone: (317) 355-5717. Providers update this record themselves, so call before visiting.
How can I verify Karl Leo Ost, M.D.'s license?
NPPES lists Indiana license number 01063661, 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 Karl Leo Ost, M.D. prescribe under Medicare Part D?
In 2024, Karl Leo Ost, M.D. had 41 Medicare Part D claims for 25 beneficiaries; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
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.