Shelly Christina Williams-Isingo, FNP-BC, PMHNP-BC
NPI 1538680822ActiveIndividual· Nurse Practitioner, Psych/Mental Health· Katy, TX
Nurse Practitioner, Psych/Mental Health (FNP-BC, PMHNP-BC) with Mosaic Mental Health, practicing in Katy, Texas. 38 Medicare patients in 2024, $3,877 paid; nearly all of their 169 Part D prescriptions were generic (96%). Abbvie Inc. was the largest of 4 companies reporting payments in 2025, $203.16 in all, mostly food and beverage.
Overview
| NPI | 1538680822 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | FNP-BC, PMHNP-BC |
| Sole proprietor | No |
| NPI issued | Jun 27, 2017 |
| Last updated in NPPES | Sep 8, 2026 |
| Certified by provider | Sep 8, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Psych/Mental Health Primary | 363LP0808X | AP138281 | TX |
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 (FL); Practitioner - Nurse Practitioner (LA); Practitioner - Nurse Practitioner (MI); Practitioner - Nurse Practitioner (OH); Practitioner - Nurse Practitioner (TX); Practitioner - Nurse Practitioner (VA); Practitioner - Nurse Practitioner (WA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 38 |
|---|---|
| Services billed | 164 across 21 procedure codes |
| Paid by Medicare | $3,877 |
Part D prescriptions in 2024
| Prescriptions (claims) | 169 · 180 30-day fills |
|---|---|
| Patients | 90 |
| Total drug cost | $1,526 |
| Generic share | 96% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Nurse Practitioner |
| Telehealth | Offers telehealth |
Medical group
- Mosaic Mental HealthFulshear, TX · 3 clinicians
Industry payments (Open Payments)
- 2025$203.16 · 13 payments from 4 companies
- 2024$97.46 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $137.95 | 10 |
| Janssen Pharmaceuticals, Inc | $24.54 | 1 |
| Otsuka America Pharmaceutical, Inc. | $23.06 | 1 |
| Corium, LLC | $17.61 | 1 |
What the 2025 payments were for
- Food and Beverage$174.21 · 10 payments
- Education$28.95 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 116 psychiatric nurse practitioners in Katy · All psychiatric nurse practitioners in Texas