Quick answers
- Does Michael S. Williams Jr. accept Medicare assignment?
- Yes. Medicare's clinician data says Michael S. 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 Michael S. Williams Jr. see?
- In 2024, CMS data shows 315 Original Medicare patients and 548 services for Michael S. Williams Jr.. This counts Original Medicare only and measures volume, not quality.
- What is Michael S. Williams Jr.'s NPI number?
- 1750544011. 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 Michael S. 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 | 315 |
|---|---|
| Services billed to Medicare | 548 |
| Different services or procedures | 88 |
| Participating Medicare provider | Yes |
| Average age of these patients | 69 |
Most frequent services
- Ultrasound study of arm or leg veins with compression and maneuvers (93970)77 services
- Ultrasound of both sides of head and neck blood flow (93880)50 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)50 services
- Ultrasound study of arm and leg arteries (93922)47 services
- Ultrasound study of one arm or leg veins with compression and maneuvers (93971)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 cholesterol75%
- Ischemic heart disease54%
- Chronic kidney disease54%
- Arthritis52%
- Diabetes51%
Hospitals where Michael S. Williams Jr. works
Medicare's Facility Affiliation Data lists Michael S. Williams Jr. 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.
- SSM Health Saint Louis University HospitalSaint Louis, MO · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 260105
- SSM Health St Mary's Hospital - St LouisSaint Louis, MO · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 260091
- SSM St Clare Health CenterFenton, MO · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 260081
Practice locations
Addresses where Michael S. Williams Jr. is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 8; the Medicare profile lists all.
- 10101 Woodfield LnSaint Louis, MO 63132 (608) 280‑4647
- 1011 Bowles Ave, Suite 225Fenton, MO 63026 (314) 617‑2000
- 1011 Bowles Ave, Suite 425Fenton, MO 63026 (314) 617‑2000
- 1015 Bowles AveFenton, MO 63026 (314) 257‑3390
- 1201 S Grand BlvdSaint Louis, MO 63104 (314) 617‑2000
Group practices
Medicare enrollment lists Michael S. Williams Jr. as a member of this group (CMS data updated October 2, 2026).
- SSM Health Care Group940 clinicians in the group
Specialties
- Vascular Surgeryprimary
- General Surgeryalso
Other vascular surgeons in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in SSM Health Care Group
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2008 (18 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1750544011 |
| 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