Brennan David Walker, APRN, CNP
NPI 1215692702ActiveIndividual· Nurse Practitioner, Acute Care· Oklahoma City, OK
Nurse Practitioner, Acute Care (APRN, CNP) with Ohh Physicians LLC, practicing in Oklahoma City, Oklahoma. Their prescriptions cost Medicare Part D more than their services did: $163,724 for 1,466 claims, against $51,742 paid for services in 2024. E.R. Squibb & Sons, L.L.C. was the largest of 2 companies reporting payments in 2025, $51.52 in all, mostly food and beverage. Lists Mercy Hospital Logan County and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1215692702 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | APRN, CNP |
| Sole proprietor | No |
| NPI issued | Nov 1, 2021 |
| Last updated in NPPES | Feb 16, 2023 |
| Certified by provider | Feb 16, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner, Acute Care Primary | 363LA2100X | 204622 | OK |
| Nurse Practitioner, Family | 363LF0000X | 204622 | OK |
| Nurse Practitioner, Gerontology | 363LG0600X | 204622 | OK |
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 - Nurse Practitioner (OK) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 760 |
|---|---|
| Services billed | 948 across 8 procedure codes |
| Paid by Medicare | $51,742 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,466 · 3,354 30-day fills |
|---|---|
| Patients | 420 |
| Total drug cost | $163,724 |
| Generic share | 87% of claims |
Education and affiliations
| Graduation year | 2021 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Ohh Physicians LLCOklahoma City, OK · 133 clinicians
Hospital affiliations
- Mercy Hospital Logan CountyGuthrie, OK
- Mercy Hospital Oklahoma City, IncOklahoma City, OK
- O U Medical CenterOklahoma City, OK
- Oklahoma Heart Hospital South, LLCOklahoma City, OK
- Oklahoma Heart Hospital, LLCOklahoma City, OK
Industry payments (Open Payments)
- 2025$51.52 · 3 payments from 2 companies
- 2024$253.17 · 13 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $32.00 | 2 |
| Pfizer Inc. | $19.52 | 1 |
What the 2025 payments were for
- Food and Beverage$51.52 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 118 acute care nurse practitioners in Oklahoma City · All acute care nurse practitioners in Oklahoma