Quick answers
- Where does Rosalyn Williams see patients?
- Medicare's clinician data lists 2 practice locations, including Washington, DC and Riverdale, MD. Call before your visit to confirm the address.
- What is Rosalyn Williams's specialty?
- Medicare lists Clinical Social Worker as the primary specialty.
- Does Rosalyn Williams accept Medicare assignment?
- Yes. Medicare's clinician data says Rosalyn 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 Rosalyn Williams?
- (202) 878-6626, as listed in official Medicare / NPI Registry data.
- What is Rosalyn Williams's NPI number?
- 1962839720. 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 Rosalyn Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 3300 Pennsylvania Ave SEWashington, DC 20020 (202) 878‑6626
- 4409 E W HwyRiverdale, MD 20737 (718) 298‑4375
Group practices
Medicare enrollment lists Rosalyn Williams as a member of these groups (CMS data updated 2026-10-02).
- Supportive Care of Maryland LLC39 clinicians in the group
- Umbrella Therapeutic Services, Inc.5 clinicians in the group
Specialties
- Clinical Social Workerprimary
Find other clinicians: Clinical Social Worker, District of Columbia →
Other clinical social workers in Washington
Clinicians with the same Medicare primary specialty in Washington, DC — not a recommendation.
Clinician information
| Credential | CSW |
|---|---|
| Graduation year | 1995 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1962839720 |
| 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