Quick answers
- Where does Treacy Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Saint Louis, MO. Call before your visit to confirm the address.
- What is Treacy Williams's specialty?
- Medicare lists Nurse Practitioner as the primary specialty.
- Does Treacy Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Treacy 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 Treacy Williams?
- (314) 985-8035, as listed in official Medicare / NPI Registry data.
- What is Treacy Williams's NPI number?
- 1477184299. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Treacy Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 1040 N Mason Rd, Suite 201Saint Louis, MO 63141 (314) 985‑8035
- 4444 Forest Park Ave, Suite 2600Saint Louis, MO 63108 (314) 286‑0200
Group practices
Medicare enrollment lists Treacy Williams as a member of these groups (CMS data updated 2026-10-02).
- Washington University3,029 clinicians in the group
- M Seraji MD LLC3 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Saint Louis
Clinicians with the same Medicare primary specialty in Saint Louis, MO — not a recommendation.
Clinician information
| Graduation year | 2019 |
|---|---|
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1477184299 |
| 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 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