Karen Rosa Nunez-Wallace, MD
NPI 1811121197ActiveIndividual· Psychiatry & Neurology, Neurology· Huntington Beach, CA
Psychiatry & Neurology, Neurology (MD) in Huntington Beach, California, trained at Texas Tech University Health Science Center School of Medicine (class of 2009). Their prescriptions cost Medicare Part D more than their services did: $605,922 for 2,402 claims, against $12,369 paid for services in 2024. Pfizer Inc. was the largest of 7 companies reporting payments in 2025, $836.29 in all, mostly food and beverage.
Overview
| NPI | 1811121197 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 14, 2009 |
| Last updated in NPPES | Jul 7, 2026 |
| Certified by provider | Jul 7, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Neurology Primary | 2084N0400X | C163965 | 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 - Neurosurgery (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 83 |
|---|---|
| Services billed | 144 across 18 procedure codes |
| Paid by Medicare | $12,369 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,402 · 4,873 30-day fills |
|---|---|
| Patients | 410 |
| Total drug cost | $605,922 |
| Generic share | 93% of claims |
Education and affiliations
| Medical school | Texas Tech University Health Science Center School of Medicine |
|---|---|
| Graduation year | 2009 |
| Medicare specialty | Neurosurgery |
| Telehealth | Offers telehealth |
Medical group
- Healthcare Partners Affiliates Medical GroupAnaheim, CA · 754 clinicians
Industry payments (Open Payments)
- 2025$836.29 · 8 payments from 7 companies
- 2024$226.68 · 2 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Pfizer Inc. | $218.90 | 2 |
| Amgen Inc. | $125.00 | 1 |
| Abbvie Inc. | $124.88 | 1 |
| Alexion Pharmaceuticals, Inc. | $121.63 | 1 |
| Amneal Pharmaceuticals LLC | $118.96 | 1 |
What the 2025 payments were for
- Food and Beverage$821.29 · 7 payments
- Education$15.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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