Ronald Anthony Zimmermann, D.O.
Hospitalist Physician · Naperville, IL
Ronald Anthony Zimmermann, D.O. is a hospitalist physician with a practice address in Naperville, Illinois, and NPI 1346404985, issued on Jul 14, 2008. Check the license (Illinois 036.128777, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Ronald Anthony Zimmermann
- Credential
- D.O.
- Primary taxonomy
- Hospitalist Physician 208M00000X
- License numbers
- 036.128777 IL
036128777 IL
125054800 IL
Self-reported in NPPES; status is on the state search - Practice location
- 801 S Washington St, Naperville, IL 60540
- Phone
- (630) 646-8704
- Enumerated
- Jul 14, 2008
- Record last updated
- Dec 10, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20110915000247); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2008
- Entity
- Type 1 · individual
8 nearest hospitalist physician records → All 1,535 in Illinois → Look up another NPI →
Also registered at 801 S Washington St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Faisal Akbari, M.DHospitalist Physician1740598705
- Catherine AlerNurse Practitioner1134584964
- Irfan Ali, DOHospitalist Physician1306427760
- Sivani Aluru, MDObstetrics & Gynecology Physician1275156325
Verify Ronald Anthony Zimmermann 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 036.128777Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
71% fewer Medicare Part D claims than the average hospitalist physician in 2024
152 Medicare Part D claims for 49 beneficiaries, against an average of 521 among the 21,613 providers of this specialty who prescribed in Part D.
Most prescribed
- Basaglar Kwikpen U-10018 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 3 group practices
- Endeavor Health Medical GroupElmhurst, IL
- Rockford Hospitalist Group LLCRockford, IL
- Sound Physicians OF Illinois LLCDanville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Ronald Anthony Zimmermann among 1,535 hospitalist physician records in Illinois
Ronald Anthony Zimmermann, D.O. is one of 1,535 hospitalist physician records with a practice address in Illinois. 92% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2008, is newer than 19% of them.
- NPI issued2008 · 19% of these records are older, 74% newer
- In a Medicare fileYes · 92% of these records are
- In the CMS Doctors and Clinicians fileYes · 87% of these records are
- Graduated2008 · median 2013 among the 1,339 with a school on file
- Record last updated2021 · 32% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208M00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Hospitalist Physician providers in Illinois
There are 1,535 hospitalist physician records in Illinois.
All 1,535 in Illinois → Every provider in Naperville → Hospitalist Physician nationwide →
The 8 hospitalist physician records with the nearest ZIP codes
- Rahul Agarwal, M.D.Naperville, IL 605401992930374
- Galina Artemyeva, M.D.Naperville, IL 605401609038579
- Stephen Baldwin, MDNaperville, IL 605401790772457
- Armughan Bangash, M.DNaperville, IL 605401962679852
- Menka Desai, M.D.Naperville, IL 605401912155169
- Matthew Dunne, M.D.Naperville, IL 605401588853113
- Durre Khalil, M.D.Naperville, IL 605401487896940
- Masue Li, MDNaperville, IL 605401730287376
Common questions
What is Ronald Anthony Zimmermann, D.O.'s NPI number?
Ronald Anthony Zimmermann, D.O.'s National Provider Identifier (NPI) is 1346404985, issued on Jul 14, 2008. An NPI identifies a provider in billing; it is not a license.
Where is Ronald Anthony Zimmermann, D.O. located?
The NPPES record lists a practice address at 801 S Washington St, Naperville, IL, 60540. Phone: (630) 646-8704. Providers update this record themselves, so call before visiting.
How can I verify Ronald Anthony Zimmermann, D.O.'s license?
NPPES lists Illinois license number 036.128777, 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 Ronald Anthony Zimmermann, D.O. prescribe under Medicare Part D?
In 2024, Ronald Anthony Zimmermann, D.O. had 152 Medicare Part D claims for 49 beneficiaries; the average among hospitalist physician prescribers was 521. 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.