John G. Leiner, M.D.
Internal Medicine Physician · Quincy, IL
John G. Leiner, M.D. is an internal medicine physician with a practice address in Quincy, Illinois, and NPI 1962571596, issued on Nov 7, 2006. Check the license (Illinois 036171859, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- John G. Leiner
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 036171859 IL
0101224017 VA
Self-reported in NPPES; status is on the state search - Practice location
- 927 Broadway St, Quincy, IL 62301
- Phone
- (217) 224-6423
- Enumerated
- Nov 7, 2006
- Record last updated
- Jan 20, 2025
- Fax
- (217) 228-3251
- Medicare enrollment
- Enrolled (PECOS I20241008002455); accepts Medicare assignment
- Medical or professional school
- Virginia Commonwealth University, School Of Medicine, 1991
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
Also registered at 927 Broadway St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sara Baig, M.D.Cardiovascular Disease Physician1437248911
- Julie Barry, APRNFamily Nurse Practitioner1689889834
- Loretta Baustian, D.O.Pediatrics Physician1538153408
Verify John G. Leiner 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 036171859Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
53% more Medicare Part D claims than the average internal medicine physician in 2024
4,847 Medicare Part D claims for 377 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of claims. 174 claims were for opioids.
Most prescribed
- Atorvastatin Calcium280 claims
- Amlodipine Besylate251 claims
- Lisinopril228 claims
- Rosuvastatin Calcium174 claims
- Albuterol Sulfate Hfa156 claims
- Jardiance103 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 practice group's MIPS final score for 2023 (Medicare payment program): 79.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. 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, group reporting; category weights for 2023 (qpp.cms.gov).
One hospital affiliation
- Blessing HospitalQuincy, IL · Acute Care Hospitals4 of 5 stars
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
John G. Leiner among 7,238 internal medicine physician records in Illinois
John G. Leiner, 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 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 61% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 50% of these records are
- Graduated1991 · median 2003 among the 3,580 with a school on file
- Record last updated2025 · 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).
26 internal medicine physician records list a practice address in Quincy
They are 26 of the 1,336 NPPES records with a practice address in Quincy, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Quincy → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Gregory Andrews, MDQuincy, IL 623011861470387
- Mary Barthel, MDQuincy, IL 623011194729087
- Malcolm Findlater, M.D.Quincy, IL 623011508864018
- Mike Hackmann, M.D.Quincy, IL 623011811005382
- William Hyde, MDQuincy, IL 623011578598827
- Louis Kim, M.D.Quincy, IL 623011467425405
- Kurt Leimbach, M.D.Quincy, IL 623011982677373
- James Love, M.D.Quincy, IL 623011073595310
Common questions
What is John G. Leiner, M.D.'s NPI number?
John G. Leiner, M.D.'s National Provider Identifier (NPI) is 1962571596, issued on Nov 7, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John G. Leiner, M.D. located?
The NPPES record lists a practice address at 927 Broadway St, Quincy, IL, 62301. Phone: (217) 224-6423. Providers update this record themselves, so call before visiting.
How can I verify John G. Leiner, M.D.'s license?
NPPES lists Illinois license number 036171859, 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 John G. Leiner, M.D. prescribe under Medicare Part D?
In 2024, John G. Leiner, M.D. had 4,847 Medicare Part D claims for 377 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is John G. Leiner, M.D.'s MIPS final score?
The 2023 MIPS final score is 79.4 of 100, reported for the practice group. 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.