Quick answers
- Does Lonnie L. Williams Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Lonnie L. Williams Jr. 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 Lonnie L. Williams Jr. see?
- In 2024, CMS data shows 29 Original Medicare patients and 44 services for Lonnie L. Williams Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Lonnie L. Williams Jr.'s NPI number?
- 1225045669. 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 Lonnie L. Williams Jr., 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 | 29 |
|---|---|
| Services billed to Medicare | 44 |
| Different services or procedures | 5 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more (99212)25 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 cholesterol48%
- Arthritis45%
- Chronic kidney disease38%
Practice locations
Addresses where Lonnie L. Williams Jr. is enrolled with Medicare (CMS data updated October 2, 2026).
- 353 E 162nd StSouth Holland, IL 60473 (708) 331‑3553
- 9617 S Western AveChicago, IL 60643 (708) 425‑4350
Specialties
- Optometryprimary
Other optometrists in Illinois
Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 1989 (37 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1225045669 |
| 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