Quick answers
- Does William J. Finn accept Medicare assignment?
- Yes. Medicare's clinician data says William J. Finn 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 William J. Finn see?
- In 2024, CMS data shows 205 Original Medicare patients and 985 services for William J. Finn. This counts Original Medicare only and measures volume, not quality.
- What is William J. Finn's NPI number?
- 1942203450. 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 William J. Finn, 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 | 205 |
|---|---|
| Services billed to Medicare | 985 |
| Different services or procedures | 48 |
| Participating Medicare provider | Yes |
| Average age of these patients | 76 |
Most frequent services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)227 services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)135 services
- Trimming of dystrophic nails, any number (G0127)89 services
- Test or measurement for functional capacity, each 15 minutes (97750)64 services
- Removal of noncancer thickened skin growth, 2-4 growths (11056)44 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 cholesterol72%
- Arthritis57%
- Diabetes51%
- Ischemic heart disease36%
- Chronic kidney disease36%
Hospitals where William J. Finn works
Medicare's Facility Affiliation Data lists William J. Finn at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Rush Oak Park HospitalOak Park, IL · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 140063
- West Suburban Medical CenterOak Park, IL · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: not listed by Medicare · CCN 140049
Practice locations
Addresses where William J. Finn is enrolled with Medicare (CMS data updated October 2, 2026).
- 1660 Feehanville Dr, Suite 100Mount Prospect, IL 60056 (847) 627‑4924
- 610 S Maple Ave, Suite 2550Oak Park, IL 60304 (847) 390‑7666
Group practices
Medicare enrollment lists William J. Finn as a member of this group (CMS data updated October 2, 2026).
- Weil Foot and Ankle Institute LLC56 clinicians in the group
Specialties
- Podiatryprimary
Other podiatrists in Mount Prospect
Clinicians with the same Medicare primary specialty in Mount Prospect, IL — not a recommendation.
Other clinicians in Weil Foot and Ankle Institute LLC
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | DPM |
|---|---|
| Podiatric medical school | William M. Scholl College Of Podiatric Medicine |
| Graduation year | 1985 (41 years since podiatric medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1942203450 |
| 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
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- 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