Ronald Zimmermann, D.O.
NPI 1346404985 · Hospitalist Physician · Naperville, IL
Provider details
- NPI number
- 1346404985
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- D.O.
- Sex
- Male
- Sole proprietor
- No
- License
- 125054800 (IL)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
17 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
5 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
730 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Initial Hospital Care With Moderate Level of Medical Decision Making, If Using Time, at Least 75 Minutes99223 | 572 | $174 |
| Subsequent Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 89 | $77 |
| Critical Care, First 30-74 Minutes99291 | 43 | $217 |
| Hospital Discharge Day Management, More Than 30 Minutes99239 | 26 | $110 |
Typical Medicare-allowed amounts for these services range $77–$217 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
Practice location
Mailing address
Additional practice locations (4)
- 405 W Jackson StCarbondale, IL 62901-1462Phone: (618) 549-0721
- 201 S 14th StHerrin, IL 62948-3631Phone: (618) 942-2171Fax: (618) 988-6166
- 2 S Hospital DrMurphysboro, IL 62966-3333Phone: (618) 684-3156
- 1005 Broadway StQuincy, IL 62301-2834Phone: (217) 223-8400
Registry dates
- Enumerated
- 2008-07-14
- Last updated
- 2021-12-10
- Certified
- 2021-12-10
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.