Mark M. Casillas, M.D.
NPI 1598709305ActiveIndividual· Orthopaedic Surgery, Foot and Ankle Surgery· San Antonio, TX
Orthopaedic Surgery, Foot and Ankle Surgery (M.D.) in San Antonio, Texas, trained at University of Texas Medical School at San Antonio (class of 1991). 423 Medicare patients in 2024, $156,660 paid; nearly all of their 55 Part D prescriptions were generic (96%). Paragon 28, Inc. was the largest of 2 companies reporting payments in 2025, $226.42 in all, mostly food and beverage.
Overview
| NPI | 1598709305 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 15, 2006 |
| Last updated in NPPES | Feb 10, 2022 |
| Certified by provider | Dec 13, 2019 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Orthopaedic Surgery, Foot and Ankle Surgery Primary | 207XX0004X | J1917 | TX |
| Orthopaedic Surgery | 207X00000X | J1917 | 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 - Orthopedic Surgery (TX) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 423 |
|---|---|
| Services billed | 2,159 across 108 procedure codes |
| Paid by Medicare | $156,660 |
Part D prescriptions in 2024
| Prescriptions (claims) | 55 · 68 30-day fills |
|---|---|
| Patients | 34 |
| Total drug cost | $1,744 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | University of Texas Medical School at San Antonio |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Orthopedic Surgery |
Medical group
- Methodist Physician Practices PLLCLive Oak, TX · 175 clinicians
Hospital affiliations
- Methodist Hospital Stone OakSan Antonio, TX
- Peterson Regional Medical CenterKerrville, TX
Other facilities
- Methodist Healthcare at HomeHome health agency · San Antonio, TX
Industry payments (Open Payments)
- 2025$226.42 · 3 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Paragon 28, Inc. | $204.59 | 2 |
| Davol Inc. | $21.83 | 1 |
What the 2025 payments were for
- Food and Beverage$226.42 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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