Quick answers
- Does William F. Kiefer accept Medicare assignment?
- Yes. Medicare's clinician data says William F. Kiefer 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 F. Kiefer see?
- In 2024, CMS data shows 258 Original Medicare patients and 323 services for William F. Kiefer. This counts Original Medicare only and measures volume, not quality.
- What is William F. Kiefer's NPI number?
- 1588627400. 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 F. Kiefer, 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 | 258 |
|---|---|
| Services billed to Medicare | 323 |
| Different services or procedures | 10 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- Established patient complete exam of visual system (92014)218 services
- Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more (99213)59 services
- Exam of visual field with extended testing (92083)17 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 cholesterol74%
- High blood pressure70%
- Arthritis45%
- Anxiety23%
- Diabetes22%
- Ischemic heart disease22%
Practice locations
Addresses where William F. Kiefer is enrolled with Medicare (CMS data updated October 2, 2026).
- 12406 Tesson Ferry RdSaint Louis, MO 63128 (314) 843‑1716
- 3122 S Grand Blvd, The Spec ShoppeSt Louis, MO 63118 (314) 450‑7313
Group practices
Medicare enrollment lists William F. Kiefer as a member of this group (CMS data updated October 2, 2026).
- Clarkson Optometry Inc82 clinicians in the group
Specialties
- Optometryprimary
Other optometrists in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Other clinicians in Clarkson Optometry Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | OD |
|---|---|
| Optometry school | Illinois College Of Optometry At Chicago |
| Graduation year | 1975 (51 years since optometry school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1588627400 |
| 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