Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Dr. Ronald Anthony Zimmermann, DO

Individual provider Internal Medicine Physician · NPI 1346404985

Dr. Ronald Anthony Zimmermann, DO is an Internal Medicine in Naperville, Illinois. Graduated from Lake Erie College of Osteopathic Medicine, Erie in 2008, 18 years ago. Practices with Rockford Hospitalist Group LLC, a 42-clinician group, works from 5 locations and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
18
Trained at
Lake Erie College of Osteopathic Medicine, Erie
Licensed in
IL
In the registry since
2008
Specialties on file
3
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Practice location Address checks out

801 S Washington St
Naperville, IL 60540-7430
Phone: (630) 646-8704
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (4)

  • 405 W Jackson St, Carbondale, IL 62901-1462 — (618) 549-0721
  • 201 S 14th St, Herrin, IL 62948-3631 — (618) 942-2171
  • 2 S Hospital Dr, Murphysboro, IL 62966-3333 — (618) 684-3156
  • 1005 Broadway St, Quincy, IL 62301-2834 — (217) 223-8400

Specialties & licences

Hospitalist Physician (primary) Taxonomy 208M00000X · Licence 036.128777 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125054800 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036128777 (IL)

Record details

NPI number1346404985
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJuly 14, 2008
Last updated in NPPESDecember 10, 2021
Certification dateDecember 10, 2021
Mailing address1319 Wingfield Way, Bolingbrook, IL 60490-4529

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesHOSPITALIST
Medical schoolLAKE ERIE COLLEGE OF OSTEOPATHIC MEDICINE, ERIE
Graduated 2008 (18 years in practice)
Group practice Rockford Hospitalist Group Llc — 42 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

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