Megan Joan Castillo, PA
NPI 1447781091ActiveIndividual· Physician Assistant· Spring, TX
Physician Assistant (PA) with Gastroenterology Partners of North Houston PLLC, practicing in Spring, Texas. Their prescriptions cost Medicare Part D more than their services did: $374,669 for 1,066 claims, against $86,660 paid for services in 2024. Abbvie Inc. was the largest of 22 companies reporting payments in 2025, $3,897 in all, mostly food and beverage. Lists Houston Methodist the Woodlands Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1447781091 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | Mar 24, 2017 |
| Last updated in NPPES | Mar 24, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | PA11127 | TX |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Physician Assistant (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 454 |
|---|---|
| Services billed | 807 across 18 procedure codes |
| Paid by Medicare | $86,660 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,066 · 1,811 30-day fills |
|---|---|
| Patients | 438 |
| Total drug cost | $374,669 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2016 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Gastroenterology Partners of North Houston PLLCShenandoah, TX · 10 clinicians
Hospital affiliations
- Houston Methodist the Woodlands HospitalThe Woodlands, TX
- Houston Methodist Willowbrook HospitalHouston, TX
- Huntsville Memorial HospitalHuntsville, TX
- Memorial Hermann Hospital SystemHouston, TX
- St Luke's the Woodlands HospitalThe Woodlands, TX
Industry payments (Open Payments)
- 2025$3,897 · 165 payments from 22 companies
- 2024$3,714 · 137 payments from 20 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $1,095 | 57 |
| Ipsen Biopharmaceuticals, Inc | $391.52 | 7 |
| Janssen Biotech, Inc. | $360.06 | 11 |
| Takeda Pharmaceuticals U.S.A., Inc. | $331.47 | 11 |
| Regeneron Healthcare Solutions, Inc. | $253.43 | 7 |
What the 2025 payments were for
- Food and Beverage$3,897 · 165 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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