Michael Castillo, MD
Internal Medicine, Gastroenterology (MD) with Aga Professional Services LLC and 1 other group, practicing in Atlanta, Georgia. Their prescriptions cost Medicare Part D more than their services did: $292,610 for 287 claims, against $54,966 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 10 companies reporting payments in 2025, $908.99 in all, mostly food and beverage. Lists Northside Hospital 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 | 1407389844 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 4, 2017 |
| Last updated in NPPES | Feb 27, 2025 |
| Certified by provider | Feb 27, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 103068 | GA |
| Internal Medicine, Gastroenterology | 207RG0100X | 322391 | NY |
Exclusion screening
Possible match: verify before acting. The OIG list has a record with the same name in Georgia, 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 | Michael Robert Castillo · Nurse/Nurses Aide | 1128b4 | Jan 20, 2026 | Waynesville, GA |
| 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 - Gastroenterology (GA); Practitioner - Internal Medicine (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 221 |
|---|---|
| Services billed | 545 across 27 procedure codes |
| Paid by Medicare | $54,966 |
Part D prescriptions in 2024
| Prescriptions (claims) | 287 · 371 30-day fills |
|---|---|
| Patients | 121 |
| Total drug cost | $292,610 |
| Generic share | 72% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical groups
- Aga Professional Services LLCAtlanta, GA · 177 clinicians
- Aga, LLCPooler, GA · 137 clinicians
Hospital affiliation
- Northside HospitalAtlanta, GA
Industry payments (Open Payments)
- 2025$908.99 · 35 payments from 10 companies
- 2024$198.85 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $235.65 | 8 |
| Abbvie Inc. | $216.28 | 9 |
| Boston Scientific Corporation | $106.63 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $95.91 | 5 |
| Janssen Biotech, Inc. | $53.99 | 1 |
What the 2025 payments were for
- Food and Beverage$815.44 · 33 payments
- Education$93.55 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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