Quick answers
- Does Ronald K. Wassenar accept Medicare assignment?
- Yes. Medicare's clinician data says Ronald K. Wassenar accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Ronald K. Wassenar see?
- In 2024, CMS data shows 76 Original Medicare patients and 469 services for Ronald K. Wassenar. This counts Original Medicare only and measures volume, not quality.
- What is Ronald K. Wassenar's NPI number?
- 1891974341. 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 K. Wassenar, 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 | 76 |
|---|---|
| Services billed to Medicare | 469 |
| Different services or procedures | 2 |
| Participating Medicare provider | Yes |
| Average age of these patients | 74 |
Most frequent services
- Chiropractic manipulative treatment, 5 spinal regions (98942)463 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).
- Arthritis75%
- High cholesterol64%
- High blood pressure54%
- Depression17%
- Anxiety17%
- Diabetes16%
Practice locations
Addresses where Ronald K. Wassenar is enrolled with Medicare (CMS data updated October 2, 2026).
- 10526 W Cermak Rd, Suite 104Westchester, IL 60154 (708) 562‑9200
Specialties
- Chiropracticprimary
Other chiropractors in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | CH |
|---|---|
| School | National College Of Chiropractic |
| Graduation year | 1983 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1891974341 |
| 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