Derek Scott Hammer, PA
NPI 1912529629ActiveIndividual· Physician Assistant· Topeka, KS
Physician Assistant (PA) with Cotton-O'Neil Clinic Revocable Trust, practicing in Topeka, Kansas. 278 Medicare patients in 2024, $36,975 paid; nearly all of their 393 Part D prescriptions were generic (98%). Lists Stormont Vail Hospital as a hospital affiliation.
Overview
| NPI | 1912529629 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | PA |
| Sole proprietor | No |
| NPI issued | May 15, 2020 |
| Last updated in NPPES | Sep 11, 2026 |
| Certified by provider | Sep 11, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Physician Assistant Primary | 363A00000X | 15-02390 | KS |
| Physician Assistant | 363A00000X | — | — |
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 - Physician Assistant (KS) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 278 |
|---|---|
| Services billed | 2,005 across 55 procedure codes |
| Paid by Medicare | $36,975 |
Part D prescriptions in 2024
| Prescriptions (claims) | 393 · 395 30-day fills |
|---|---|
| Patients | 133 |
| Total drug cost | $3,072 |
| Generic share | 98% of claims |
Education and affiliations
| Graduation year | 2020 |
|---|---|
| Medicare specialty | Physician Assistant |
Medical group
- Cotton-O'Neil Clinic Revocable TrustTopeka, KS · 666 clinicians
Hospital affiliation
- Stormont Vail HospitalTopeka, KS
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 108 physician assistants in Topeka · All physician assistants in Kansas