Joaquin Castillo Marroquin, DO
NPI 1316407323ActiveIndividual· Emergency Medicine· Corona, CA
Emergency Medicine (DO) in Corona, California, trained at University of North Texas Hsc, College of Osteopathic Med (class of 2019). 290 Medicare patients in 2024, $40,184 paid; nearly all of their 224 Part D prescriptions were generic (97%).
Overview
| NPI | 1316407323 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Mar 25, 2019 |
| Last updated in NPPES | Jul 10, 2023 |
| Certified by provider | Jul 10, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Emergency Medicine Primary | 207P00000X | 202A20916 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Emergency Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 290 |
|---|---|
| Services billed | 384 across 17 procedure codes |
| Paid by Medicare | $40,184 |
Part D prescriptions in 2024
| Prescriptions (claims) | 224 · 238 30-day fills |
|---|---|
| Patients | 161 |
| Total drug cost | $4,260 |
| Generic share | 97% of claims |
Education and affiliations
| Medical school | University of North Texas Hsc, College of Osteopathic Med |
|---|---|
| Graduation year | 2019 |
| Medicare specialty | Emergency Medicine |
Medical groups
- Southern California Permanente Medical GroupRedlands, CA · 11,293 clinicians
- Corona Regional Emergency Medical Associates IncCorona, CA · 6 clinicians
Hospital affiliations
- Corona Regional Medical CenterCorona, CA
- Kaiser Foundation Hospital, RiversideRiverside, CA
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 18 emergency medicine physicians in Corona · All emergency medicine physicians in California