William Zato, DO
NPI 1497796809ActiveIndividual· Family Medicine· Merrillville, IN
Family Medicine (DO) in Merrillville, Indiana, trained at Midwestern University, Chicago College of Osteopathic Med (class of 1976). Their prescriptions cost Medicare Part D more than their services did: $29,542 for 433 claims, against $17,911 paid for services in 2024. Orexo US, Inc. was the largest of 2 companies reporting payments in 2025, $34.44 in all, mostly food and beverage.
Overview
| NPI | 1497796809 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | DO |
| Sole proprietor | No |
| NPI issued | Jun 9, 2006 |
| Last updated in NPPES | Aug 18, 2020 |
| Certified by provider | Aug 18, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 02000629A | IN |
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 - Family Practice (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 155 |
|---|---|
| Services billed | 171 across 4 procedure codes |
| Paid by Medicare | $17,911 |
Part D prescriptions in 2024
| Prescriptions (claims) | 433 · 527 30-day fills |
|---|---|
| Patients | 23 |
| Total drug cost | $29,542 |
| Generic share | 99% of claims |
Education and affiliations
| Medical school | Midwestern University, Chicago College of Osteopathic Med |
|---|---|
| Graduation year | 1976 |
| Medicare specialty | Family Practice |
| Secondary specialties | Geriatric Medicine |
Medical group
- Advanced Care Medical Specialists PCDyer, IN · 7 clinicians
Industry payments (Open Payments)
- 2025$34.44 · 2 payments from 2 companies
- 2024$173.62 · 4 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Orexo US, Inc. | $19.74 | 1 |
| Almatica Pharma LLC | $14.70 | 1 |
What the 2025 payments were for
- Food and Beverage$34.44 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 55 family medicine physicians in Merrillville · All family medicine physicians in Indiana