Marissa Williams, PA-C
NPI 1851688873ActiveIndividual· Physician Assistant· Zephyrhills, FL
Physician Assistant (PA-C) with Zephyrhills Family Practice and Geriatric Care LLC, practicing in Zephyrhills, Florida. Their prescriptions cost Medicare Part D more than their services did: $804,336 for 5,344 claims, against $2,367 paid for services in 2024. Novo Nordisk Inc was the largest of 14 companies reporting payments in 2025, $804.71 in all, mostly food and beverage. Lists Adventhealth Dade City and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1851688873 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA-C |
| Sole proprietor | No |
| NPI issued | Jun 29, 2011 |
| Last updated in NPPES | Jun 16, 2026 |
| Certified by provider | Jun 16, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA9106109 | FL |
| Physician Assistant | 363A00000X | — | — |
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 - Physician Assistant (FL) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 28 |
|---|---|
| Services billed | 40 across 10 procedure codes |
| Paid by Medicare | $2,367 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,344 · 13,281 30-day fills |
|---|---|
| Patients | 389 |
| Total drug cost | $804,336 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Zephyrhills Family Practice and Geriatric Care LLCZephyrhills, FL · 6 clinicians
Hospital affiliations
- Adventhealth Dade CityDade City, FL
- Adventhealth TampaTampa, FL
- Adventhealth ZephyrhillsZephyrhills, FL
Other facilities
- Pinnacle Home CareHome health agency · Oldsmar, FL
Industry payments (Open Payments)
- 2025$804.71 · 46 payments from 14 companies
- 2024$706.62 · 39 payments from 12 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $164.16 | 10 |
| Amgen Inc. | $162.84 | 12 |
| Lilly USA, LLC | $131.11 | 6 |
| Sumitomo Pharma America, Inc. | $72.35 | 4 |
| Pfizer Inc. | $70.04 | 4 |
What the 2025 payments were for
- Food and Beverage$804.71 · 46 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 32 physician assistants in Zephyrhills · All physician assistants in Florida