Quick answers
- Does Erin L. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Erin L. Williams 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 Erin L. Williams see?
- In 2024, CMS data shows 13 Original Medicare patients and 534 services for Erin L. Williams. This counts Original Medicare only and measures volume, not quality.
- What is Erin L. Williams's NPI number?
- 1538821582. 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 Erin L. Williams, 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 | 13 |
|---|---|
| Services billed to Medicare | 534 |
| Different services or procedures | 7 |
| Participating Medicare provider | Yes |
| Average age of these patients | 72 |
Most frequent services
- Therapy procedure to re-educate brain-to-nerve-to-muscle function, each 15 minutes (97112)186 services
- Therapy procedure using functional activities (97530)113 services
Practice locations
Addresses where Erin L. Williams is enrolled with Medicare (CMS data updated October 2, 2026).
- 214 E Main StMissoula, MT 59802 (406) 926‑2150
Group practices
Medicare enrollment lists Erin L. Williams as a member of this group (CMS data updated October 2, 2026).
- Endurance Physio8 clinicians in the group
Specialties
Find other clinicians: Physical Therapist in Private Practice, Montana →
Other physical therapists in Missoula
Clinicians with the same Medicare primary specialty in Missoula, MT — not a recommendation.
Other clinicians in Endurance Physio
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | PT |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1538821582 |
| 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