Allison Margaret O'Leary Williams, MSN, APRN, NP-C
NPI 1902376007ActiveIndividual· Nurse Practitioner· Greeley, CO
Nurse Practitioner (MSN, APRN, NP-C) with Sunrise Community Health, practicing in Greeley, Colorado. Their prescriptions cost Medicare Part D more than their services did: $414,443 for 2,692 claims, against $533.90 paid for services in 2024. Abbott Laboratories was the largest of 2 companies reporting payments in 2025, $47.87 in all, mostly food and beverage. Lists Banner North Colorado Medical Center as a hospital affiliation.
Overview
| NPI | 1902376007 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MSN, APRN, NP-C |
| Sole proprietor | No |
| NPI issued | Nov 30, 2018 |
| Last updated in NPPES | Jun 30, 2021 |
| Certified by provider | Jun 30, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Nurse Practitioner Primary | 363L00000X | 994420 | CO |
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 (CO) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 24 |
|---|---|
| Services billed | 35 across 6 procedure codes |
| Paid by Medicare | $533.90 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,692 · 5,403 30-day fills |
|---|---|
| Patients | 226 |
| Total drug cost | $414,443 |
| Generic share | 82% of claims |
Education and affiliations
| Graduation year | 2018 |
|---|---|
| Medicare specialty | Nurse Practitioner |
Medical group
- Sunrise Community HealthEvans, CO · 52 clinicians
Hospital affiliation
- Banner North Colorado Medical CenterGreeley, CO
Industry payments (Open Payments)
- 2025$47.87 · 2 payments from 2 companies
- 2024$34.23 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbott Laboratories | $26.34 | 1 |
| Insulet Corporation | $21.53 | 1 |
What the 2025 payments were for
- Food and Beverage$47.87 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 31 nurse practitioners in Greeley · All nurse practitioners in Colorado