Alyssa Y. Castillo, MD
NPI 1659752152ActiveIndividual· Internal Medicine, Infectious Disease· Aurora, CO
Internal Medicine, Infectious Disease (MD) in Aurora, Colorado, trained at University of Colorado School of Medicine, Aurora (class of 2015). 77 Medicare patients in 2024, $21,925 paid; nearly all of their 150 Part D prescriptions were generic (94%).
Overview
| NPI | 1659752152 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 11, 2015 |
| Last updated in NPPES | May 29, 2025 |
| Certified by provider | May 29, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | DR.0068993 | CO |
| Internal Medicine | 207R00000X | L-263365 | MA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Infectious Disease (CO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 77 |
|---|---|
| Services billed | 231 across 12 procedure codes |
| Paid by Medicare | $21,925 |
Part D prescriptions in 2024
| Prescriptions (claims) | 150 · 163 30-day fills |
|---|---|
| Patients | 22 |
| Total drug cost | $30,028 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | University of Colorado School of Medicine, Aurora |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
Medical group
- University Physicians IncorporatedAurora, CO · 3,215 clinicians
Hospital affiliation
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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