Quick answers
- Which hospitals does John M. Williams work at?
- Medicare's official clinician data lists John M. Williams at 1 hospital: Carle Foundation Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John M. Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Champaign, IL and Urbana, IL. Call before your visit to confirm the address.
- What is John M. Williams's specialty?
- Medicare lists Optometry as the primary specialty.
- Does John M. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for John M. Williams?
- (217) 902-2300, as listed in official Medicare / NPI Registry data.
- What is John M. Williams's NPI number?
- 1790880714. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John M. Williams works
Medicare's Facility Affiliation Data lists John M. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Carle Foundation HospitalUrbana, IL · Acute Care Hospital · CCN 140091
Practice locations
Addresses where John M. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 3103 Fields S DrChampaign, IL 61822 (217) 902‑2300
- 611 W Park StUrbana, IL 61801 (888) 712‑2753
Group practices
Medicare enrollment lists John M. Williams as a member of this group (CMS data updated 2026-10-02).
- Carle Health Care Incorporated1,666 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Champaign
Clinicians with the same Medicare primary specialty in Champaign, IL — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Medical school | Illinois College Of Optometry At Chicago |
| Graduation year | 1987 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1790880714 |
| 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 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- 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