Gay McManus Walker, M.D.
NPI 1043587009ActiveIndividual· Internal Medicine· Encinitas, CA
Internal Medicine (M.D.) in Encinitas, California, trained at University of California, San Diego School of Medicine (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $315,074 for 5,648 claims, against $181,781 paid for services in 2024.
Overview
| NPI | 1043587009 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 18, 2011 |
| Last updated in NPPES | Feb 13, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G63605 | 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) | Not in the public enrollment file of Oct 1, 2026 |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 645 |
|---|---|
| Services billed | 2,804 across 31 procedure codes |
| Paid by Medicare | $181,781 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,648 · 13,964 30-day fills |
|---|---|
| Patients | 665 |
| Total drug cost | $315,074 |
| Generic share | 91% of claims |
Education and affiliations
| Medical school | University of California, San Diego School of Medicine |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- Scripps Green HospitalLa Jolla, CA
- Scripps Memorial Hospital - EncinitasEncinitas, CA
- Scripps Memorial Hospital la JollaLa Jolla, 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 81 internal medicine physicians in Encinitas · All internal medicine physicians in California