P. Gunanayagam, MD
NPI 1811075997ActiveIndividual· Internal Medicine· Antioch, CA
Internal Medicine (MD) with Permanente Medical Group Inc, practicing in Antioch, California. Their prescriptions cost Medicare Part D more than their services did: $311,905 for 7,081 claims, against $2,186 paid for services in 2024. Lists Kaiser Foundation Hospital - Antioch as a hospital affiliation.
Overview
| NPI | 1811075997 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 2, 2006 |
| Last updated in NPPES | Dec 13, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A82707 | 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) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 17 |
|---|---|
| Services billed | 35 across 6 procedure codes |
| Paid by Medicare | $2,186 |
Part D prescriptions in 2024
| Prescriptions (claims) | 7,081 · 16,301 30-day fills |
|---|---|
| Patients | 669 |
| Total drug cost | $311,905 |
| Generic share | 88% of claims |
Education and affiliations
| Graduation year | 1995 |
|---|---|
| Medicare specialty | Internal Medicine |
Medical group
- Permanente Medical Group IncOakland, CA · 10,996 clinicians
Hospital affiliation
- Kaiser Foundation Hospital - AntiochAntioch, CA
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 67 internal medicine physicians in Antioch · All internal medicine physicians in California