Juan Ismael Castillo, M.D.
Internal Medicine, Endocrinology, Diabetes & Metabolism (M.D.) with El Paso County Hospital District, practicing in El Paso, Texas. Their prescriptions cost Medicare Part D more than their services did: $737,920 for 1,018 claims, against $5,224 paid for services in 2024. Corcept Therapeutics was the largest of 16 companies reporting payments in 2025, $965.24 in all, mostly food and beverage. Lists University Medical Center of El Paso as a hospital affiliation. A record with the same name and state is on the OIG exclusion list; it carries no NPI, so check it before acting.
Overview
| NPI | 1295222008 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 17, 2018 |
| Last updated in NPPES | Sep 15, 2024 |
| Certified by provider | Sep 15, 2024 |
| Reactivated | Jan 8, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Endocrinology, Diabetes & Metabolism Primary | 207RE0101X | U2452 | TX |
Exclusion screening
Possible match: verify before acting. The OIG list has a record with the same name in Texas, but that record carries no NPI, so it may be a different person or business.
| Matched by | Name on OIG list | Exclusion type | Excluded since | Location |
|---|---|---|---|---|
| Name + state | Juan Castillo · Nurse/Nurses Aide | 1128a2 | Aug 12, 1991 | New Braunfels, TX |
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | Possible (name) | See above |
| 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 - Internal Medicine (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 35 |
|---|---|
| Services billed | 74 across 4 procedure codes |
| Paid by Medicare | $5,224 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,018 · 2,418 30-day fills |
|---|---|
| Patients | 159 |
| Total drug cost | $737,920 |
| Generic share | 32% of claims |
Education and affiliations
| Graduation year | 2005 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Endocrinology |
Medical group
- El Paso County Hospital DistrictEl Paso, TX · 214 clinicians
Hospital affiliation
- University Medical Center of El PasoEl Paso, TX
Industry payments (Open Payments)
- 2025$965.24 · 25 payments from 16 companies
- 2024$1,062 · 20 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Corcept Therapeutics | $155.41 | 6 |
| Novartis Pharmaceuticals Corporation | $138.77 | 3 |
| Ascendis Pharma Endocrinology Inc | $125.01 | 1 |
| Paragon 28, Inc. | $109.33 | 1 |
| Organogenesis Inc. | $88.04 | 1 |
What the 2025 payments were for
- Food and Beverage$965.24 · 25 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Endocrinology, Diabetes & Metabolism providers in El Paso
- 1689792475
- 1831020486
- 1356661706
- 1396232039
- 1205980356
- 1205839594
- 1083684609
- 1871533372
- 1508876061
- 1689134793
- 1073523841
- 1083010060
All Internal Medicine, Endocrinology, Diabetes & Metabolism providers in Texas →