Zachary Paul Castle, D.O.
NPI 1619388774ActiveIndividual· Family Medicine· Plano, TX
Family Medicine (D.O.) with Catalyst Physician Group - Ntx, PLLC, practicing in Plano, Texas. Their prescriptions cost Medicare Part D more than their services did: $141,728 for 1,587 claims, against $32,562 paid for services in 2024. Novo Nordisk Inc was the largest of 20 companies reporting payments in 2025, $1,162 in all, mostly food and beverage. Lists Medical City Plano as a hospital affiliation.
Overview
| NPI | 1619388774 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | D.O. |
| Sole proprietor | No |
| NPI issued | May 12, 2014 |
| Last updated in NPPES | Dec 16, 2025 |
| Certified by provider | Dec 16, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | R1711 | 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 - Family Practice (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 117 |
|---|---|
| Services billed | 491 across 30 procedure codes |
| Paid by Medicare | $32,562 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,587 · 3,650 30-day fills |
|---|---|
| Patients | 207 |
| Total drug cost | $141,728 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 2014 |
|---|---|
| Medicare specialty | Family Practice |
| Telehealth | Offers telehealth |
Medical group
- Catalyst Physician Group - Ntx, PLLCMansfield, TX · 86 clinicians
Hospital affiliation
- Medical City PlanoPlano, TX
Industry payments (Open Payments)
- 2025$1,162 · 69 payments from 20 companies
- 2024$1,169 · 74 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Novo Nordisk Inc | $262.81 | 12 |
| Astrazeneca Pharmaceuticals LP | $172.60 | 21 |
| Bayer Healthcare Pharmaceuticals Inc. | $97.73 | 5 |
| Corium, LLC | $81.82 | 3 |
| Avvisto Therapeutics, LLC | $76.27 | 3 |
What the 2025 payments were for
- Food and Beverage$1,162 · 69 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 223 family medicine physicians in Plano · All family medicine physicians in Texas