Melissa Sue Clark, ARNP
NPI 1639681000ActiveIndividual· Nurse Practitioner, Gerontology· Concord, CA
Nurse Practitioner, Gerontology (ARNP) with West Coast Kidney, practicing in Concord, California. Their prescriptions cost Medicare Part D more than their services did: $374,474 for 762 claims, against $57,143 paid for services in 2024. Amgen Inc. was the largest of 6 companies reporting payments in 2025, $607.06 in all, mostly food and beverage. Lists Contra Costa Regional Medical Center as a hospital affiliation.
Overview
| NPI | 1639681000 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | ARNP |
| Sole proprietor | Yes |
| NPI issued | Oct 25, 2017 |
| Last updated in NPPES | Dec 19, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Gerontology Primary | 363LG0600X | 95007947 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 347 |
|---|---|
| Services billed | 846 across 14 procedure codes |
| Paid by Medicare | $57,143 |
Part D prescriptions in 2024
| Prescriptions (claims) | 762 · 1,857 30-day fills |
|---|---|
| Patients | 213 |
| Total drug cost | $374,474 |
| Generic share | 73% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- West Coast KidneyDaly City, CA · 56 clinicians
Hospital affiliation
- Contra Costa Regional Medical CenterMartinez, CA
Industry payments (Open Payments)
- 2025$607.06 · 26 payments from 6 companies
- 2024$528.14 · 36 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $198.22 | 9 |
| Fresenius USA Marketing, Inc. | $146.36 | 8 |
| Ardelyx, Inc. | $142.24 | 3 |
| Astrazeneca Pharmaceuticals LP | $78.78 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $26.70 | 1 |
What the 2025 payments were for
- Food and Beverage$607.06 · 26 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records