Ronald J. Koenig, MD
Endocrinology, Diabetes & Metabolism Physician · Ann Arbor, MI
Ronald J. Koenig, MD is an endocrinology, diabetes & metabolism physician with a practice address in Ann Arbor, Michigan, and NPI 1982787818, issued on Oct 23, 2006. Check the license (Michigan 4301052578, as entered in NPPES) on the Michigan Board of Medicine (LARA); the Medicare figures below come from public CMS files.
- Name
- Ronald J. Koenig
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 4301052578 MI
Self-reported in NPPES; status is on the state search - Practice location
- 1500 East Medical Center Dr, Ann Arbor, MI 48109
- Phone
- (734) 763-4876
- Enumerated
- Oct 23, 2006
- Record last updated
- Oct 24, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicaid ID
- 1897580 MI
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 270 in Michigan → Look up another NPI →
Also registered at 1500 East Medical Center Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Ronald J. Koenig in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMichigan Board of Medicine (LARA)
Search for license 4301052578Check 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 endocrinology, diabetes & metabolism physician in 2024
46 Medicare Part D claims for 24 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 59% of claims.
Most prescribed
- Levothyroxine Sodium30 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.
Ronald J. Koenig among 270 endocrinology, diabetes & metabolism physician records in Michigan
Ronald J. Koenig, MD is one of 270 endocrinology, diabetes & metabolism physician records with a practice address in Michigan. 82% 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, 58% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileNo · 72% of these records are
- Record last updated2019 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Michigan practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Endocrinology, Diabetes & Metabolism Physician providers in Michigan
There are 270 endocrinology, diabetes & metabolism physician records in Michigan.
All 270 in Michigan → Every provider in Ann Arbor → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Ariel Barkan, MDAnn Arbor, MI 481091891877320
- Gary Hammer, MDAnn Arbor, MI 481091871676791
- William Herman, MDAnn Arbor, MI 481091316020233
- Shafaq Khairi, M.D.Ann Arbor, MI 481091225284334
- Julia MeirelesAnn Arbor, MI 481091760052773
- Richard Mortensen, MDAnn Arbor, MI 481091194962530
- Joanna Spencer-Segal, MDAnn Arbor, MI 481091609161611
- Mary TownsendAnn Arbor, MI 481091891431946
Common questions
What is Ronald J. Koenig, MD's NPI number?
Ronald J. Koenig, MD's National Provider Identifier (NPI) is 1982787818, issued on Oct 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Ronald J. Koenig, MD located?
The NPPES record lists a practice address at 1500 East Medical Center Dr, Ann Arbor, MI, 48109. Phone: (734) 763-4876. Providers update this record themselves, so call before visiting.
How can I verify Ronald J. Koenig, MD's license?
NPPES lists Michigan license number 4301052578, as entered by the provider. Search the Michigan Board of Medicine (LARA) at https://aca-prod.accela.com/MILARA/GeneralProperty/PropertyLookUp.aspx?isLicensee=Y&TabName=APO. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Ronald J. Koenig, MD prescribe under Medicare Part D?
In 2024, Ronald J. Koenig, MD had 46 Medicare Part D claims for 24 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.