Alyssa Susan Williams, PMHNP-BC
NPI 1528601036ActiveIndividual· Nurse Practitioner, Psych/Mental Health· Leonardtown, MD
Nurse Practitioner, Psych/Mental Health (PMHNP-BC) with Sheppard Pratt Physicians PA, practicing in Leonardtown, Maryland. Mostly services rather than prescriptions: Medicare paid $7,308 for 34 patients in 2024, with only 41 Part D claims. Lists Calverthealth Medical Center as a hospital affiliation.
Overview
| NPI | 1528601036 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PMHNP-BC |
| Sole proprietor | No |
| NPI issued | Oct 28, 2019 |
| Last updated in NPPES | Sep 24, 2020 |
| Certified by provider | Sep 24, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Psych/Mental Health Primary | 363LP0808X | R215583 | MD |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Nurse Practitioner (DC); Practitioner - Nurse Practitioner (MD) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 34 |
|---|---|
| Services billed | 125 across 6 procedure codes |
| Paid by Medicare | $7,308 |
Part D prescriptions in 2024
| Prescriptions (claims) | 41 · 41 30-day fills |
|---|---|
| Patients | 17 |
| Total drug cost | $626.23 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 2019 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Sheppard Pratt Physicians PABaltimore, MD · 67 clinicians
Hospital affiliation
- Calverthealth Medical CenterPrince Frederick, MD
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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