Quick answers
- Does Ronald J. Greenberg accept Medicare assignment?
- Medicare's clinician data says Ronald J. Greenberg may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- How many Medicare patients does Ronald J. Greenberg see?
- In 2024, CMS data shows 51 Original Medicare patients and 2,229 services for Ronald J. Greenberg. This counts Original Medicare only and measures volume, not quality.
- What is Ronald J. Greenberg's NPI number?
- 1407921448. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Ronald J. Greenberg, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 51 |
|---|---|
| Services billed to Medicare | 2,229 |
| Different services or procedures | 2 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Chiropractic manipulative treatment, 1-2 spinal regions (98940)1,206 services
- Chiropractic manipulative treatment, 3-4 spinal regions (98941)1,022 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis53%
- Diabetes47%
- COPD25%
- Ischemic heart disease24%
Practice locations
Addresses where Ronald J. Greenberg is enrolled with Medicare (CMS data updated October 2, 2026).
- 731 S W StOlney, IL 62450 (618) 392‑5511
Specialties
- Chiropracticprimary
Other chiropractors in Olney
Clinicians with the same Medicare primary specialty in Olney, IL — not a recommendation.
Clinician information
| Credential | CH |
|---|---|
| School | Palmer College Chiropractic - Davenport |
| Graduation year | 1982 |
| Gender (as listed) | Male |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1407921448 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians