John Frederick Shield, MD
NPI 1033189634ActiveIndividual· Internal Medicine· Sonora, CA
Internal Medicine (MD) with Union Associated Physicians Clinic, LLC and 1 other group, practicing in Sonora, California. Their prescriptions cost Medicare Part D more than their services did: $943,301 for 9,360 claims, against $122,451 paid for services in 2024. Lists Adventist Health Sonora and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1033189634 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jan 25, 2006 |
| Last updated in NPPES | Jun 24, 2024 |
| Certified by provider | Jun 24, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G45205 | CA |
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 (CA); Practitioner - Internal Medicine (IN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 910 |
|---|---|
| Services billed | 4,103 across 27 procedure codes |
| Paid by Medicare | $122,451 |
Part D prescriptions in 2024
| Prescriptions (claims) | 9,360 · 21,448 30-day fills |
|---|---|
| Patients | 575 |
| Total drug cost | $943,301 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical groups
- Union Associated Physicians Clinic, LLCTerre Haute, IN · 230 clinicians
- Valley Professionals Community Health Center IncTerre Haute, IN · 70 clinicians
Hospital affiliations
- Adventist Health SonoraSonora, CA
- Union Hospital ClintonClinton, IN
- Union Hospital IncTerre Haute, IN
Industry payments (Open Payments)
None reported for 2025 or 2024.
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Sonora
- 1033503081
- 1063788222
- 1083606487
- 1184687535
- 1285910554
- 1437135670
- 1538658752
- 1427293836
- 1457847154
- 1477532273
- 1619925989
- 1063941045
All 26 internal medicine physicians in Sonora · All internal medicine physicians in California