Leonard Joseph Hertko, M.D.
Internal Medicine Physician · Orland Park, IL
Leonard Joseph Hertko, M.D. is an internal medicine physician with a practice address in Orland Park, Illinois, and NPI 1407090491, issued on Apr 22, 2009. Check the license (Illinois 036038642, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Leonard Joseph Hertko
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036038642 IL
Self-reported in NPPES; status is on the state search - Practice location
- 13561 Ishnala Dr, Orland Park, IL 60462
- Phone
- (708) 349-7112
- Enumerated
- Apr 22, 2009
- Record last updated
- Apr 22, 2009 (not updated in 17 years: call before relying on the address or phone)
- Fax
- (866) 253-5694
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Verify Leonard Joseph Hertko in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036038642Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average internal medicine physician in 2024
61 Medicare Part D claims, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% 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.
Leonard Joseph Hertko among 7,238 internal medicine physician records in Illinois
Leonard Joseph Hertko, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2009, is newer than 49% of them.
- NPI issued2009 · 49% of these records are older, 49% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2009 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
30 internal medicine physician records list a practice address in Orland Park
They are 30 of the 1,925 NPPES records with a practice address in Orland Park, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Orland Park → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Pragathi Challa, MDOrland Park, IL 604621033116066
- Jack Czarlinski, M.D.Orland Park, IL 604621891894572
- James Dunne, MDOrland Park, IL 604621417944281
- Taj Elahi, MDOrland Park, IL 604621821023078
- Doris Hein, M.D.Orland Park, IL 604621265453997
- Alicja Kraska-Cwikla, M.D.Orland Park, IL 604621093802712
- George Kuefner, M.D.Orland Park, IL 604621427168442
- Salem Makdah, M.D.Orland Park, IL 604621760430557
Common questions
What is Leonard Joseph Hertko, M.D.'s NPI number?
Leonard Joseph Hertko, M.D.'s National Provider Identifier (NPI) is 1407090491, issued on Apr 22, 2009. An NPI identifies a provider in billing; it is not a license.
Where is Leonard Joseph Hertko, M.D. located?
The NPPES record lists a practice address at 13561 Ishnala Dr, Orland Park, IL, 60462. Phone: (708) 349-7112. Providers update this record themselves, so call before visiting.
How can I verify Leonard Joseph Hertko, M.D.'s license?
NPPES lists Illinois license number 036038642, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Leonard Joseph Hertko, M.D. prescribe under Medicare Part D?
In 2024, Leonard Joseph Hertko, M.D. had 61 Medicare Part D claims; the average among internal medicine physician prescribers was 3,176. 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.