Frederick B. Hernaez, MD
NPI 1205498227ActiveIndividual· Internal Medicine· Marshfield, WI
Internal Medicine (MD) with McHs Hospitals Inc, practicing in Marshfield, Wisconsin. Their prescriptions cost Medicare Part D more than their services did: $257,548 for 3,058 claims, against $12,221 paid for services in 2024. Lists Marshfield Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1205498227 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jun 29, 2019 |
| Last updated in NPPES | Apr 23, 2024 |
| Certified by provider | Apr 23, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 74654 | WI |
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 - Internal Medicine (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 129 |
|---|---|
| Services billed | 205 across 11 procedure codes |
| Paid by Medicare | $12,221 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,058 · 5,900 30-day fills |
|---|---|
| Patients | 322 |
| Total drug cost | $257,548 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2017 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | Pediatric Medicine |
| Telehealth | Offers telehealth |
Medical group
- McHs Hospitals IncMarshfield, WI · 1,197 clinicians
Hospital affiliations
- Marshfield Medical CenterMarshfield, WI
- Marshfield Medical Center - NeillsvilleNeillsville, WI
- Marshfield Medical Center - WestonWeston, WI
Other facilities
- Compassus Home HealthHome health agency · Marshfield, WI
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 66 internal medicine physicians in Marshfield · All internal medicine physicians in Wisconsin