Thomas A. Castillo, DO
NPI 1700805454ActiveIndividual· Ophthalmology· Beaver Dam, WI
Ophthalmology (DO) in Beaver Dam, Wisconsin, licensed in WI, with an NPI issued in July 2006. Their prescriptions cost Medicare Part D more than their services did: $72,523 for 765 claims, against $17,294 paid for services in 2024. Alcon Vision LLC reported $66.83 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1700805454 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Jul 19, 2006 |
| Last updated in NPPES | May 1, 2024 |
| Certified by provider | May 1, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Ophthalmology Primary | 207W00000X | 40496 | WI |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| 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 - Ophthalmology (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 169 |
|---|---|
| Services billed | 363 across 21 procedure codes |
| Paid by Medicare | $17,294 |
Part D prescriptions in 2024
| Prescriptions (claims) | 765 · 1,535 30-day fills |
|---|---|
| Patients | 182 |
| Total drug cost | $72,523 |
| Generic share | 64% of claims |
Industry payments (Open Payments)
- 2025$66.83 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Alcon Vision LLC | $66.83 | 1 |
What the 2025 payments were for
- Food and Beverage$66.83 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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