Allison Margaret O'Leary Williams, MSN, APRN, NP-C
Nurse Practitioner · Greeley, CO
Allison Margaret O'Leary Williams, MSN, APRN, NP-C is a nurse practitioner with a practice address in Greeley, Colorado, and NPI 1902376007, issued on Nov 30, 2018. Check the license (Colorado 994420, as entered in NPPES) with the Colorado board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Allison Margaret O'Leary Williams
- Credential
- MSN, APRN, NP-C
- Primary taxonomy
- Nurse Practitioner 363L00000X
- License number
- 994420 CO
Self-reported in NPPES; status is on the state search - Practice location
- 1010 A St, Greeley, CO 80631
- Phone
- (970) 313-0400
- Enumerated
- Nov 30, 2018
- Record last updated
- Jun 30, 2021 (not updated in 5 years: call before relying on the address or phone)
- Fax
- (970) 313-0404
- Medicare enrollment
- Enrolled (PECOS I20190215002059); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest nurse practitioner records → All 1,260 in Colorado → Look up another NPI →
Also registered at 1010 A St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Ayme Bejarano, APNNurse Practitioner1568187813
- Carolyn Bottone-Post, CNMAdvanced Practice Midwife1619935996
- Lauren Conner, PA-CMedical Physician Assistant1063274058
- Samuel Davis, MDFamily Medicine Physician1336407758
- Kathryn HawleyPhysician Assistant1962230110
Verify Allison Margaret O'Leary Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Colorado board licenses this profession
Search for license 994420Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.4 times the Medicare Part D claims of the average nurse practitioner in 2024
2,692 Medicare Part D claims for 226 beneficiaries, against an average of 1,109 among the 54,319 providers of this specialty who prescribed in Part D. Brand-name drugs were 17% of claims. 343 claims were for opioids.
Most prescribed
- Atorvastatin Calcium137 claims
- Levothyroxine Sodium111 claims
- Gabapentin91 claims
- Rosuvastatin Calcium84 claims
- Duloxetine Hcl81 claims
- Hydrocodone-Acetaminophen78 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $34.23
1 payment: food and beverage; the largest payer was Insulet Corporation. The 38,884 providers of this specialty with any payment received $791.64 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Sunrise Community HealthGreeley, CO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Allison Margaret O'Leary Williams among 1,260 nurse practitioner records in Colorado
Allison Margaret O'Leary Williams, MSN, APRN, NP-C is one of 1,260 nurse practitioner records with a practice address in Colorado. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 62% of them.
- NPI issued2018 · 62% of these records are older, 34% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2018 · median 2018 among the 662 with a school on file
- Record last updated2021 · 46% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363L00000X and a Colorado practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nurse Practitioner providers in Colorado
There are 1,260 nurse practitioner records in Colorado.
All 1,260 in Colorado → Every provider in Greeley → Nurse Practitioner nationwide →
The 8 nurse practitioner records with the nearest ZIP codes
- Ayme Bejarano, APNGreeley, CO 806311568187813
- Paula Clark, FNPGreeley, CO 806311366867400
- Breanna CrawfordGreeley, CO 806311326996083
- Sheryl Ehrman, F.N.P.Greeley, CO 806311912967035
- Sean Fitzgerald, MSN FNP-CGreeley, CO 806311598443194
- Paige Hiss, NPGreeley, CO 806311831851179
- Brittany LainGreeley, CO 806311003208661
- Lana McCallum, NPGreeley, CO 806311922079482
Common questions
What is Allison Margaret O'Leary Williams, MSN, APRN, NP-C's NPI number?
Allison Margaret O'Leary Williams, MSN, APRN, NP-C's National Provider Identifier (NPI) is 1902376007, issued on Nov 30, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Allison Margaret O'Leary Williams, MSN, APRN, NP-C located?
The NPPES record lists a practice address at 1010 A St, Greeley, CO, 80631. Phone: (970) 313-0400. Providers update this record themselves, so call before visiting.
How can I verify Allison Margaret O'Leary Williams, MSN, APRN, NP-C's license?
NPPES lists Colorado license number 994420, as entered by the provider. Search the Colorado board that licenses this profession; the NPPES record confirms identity only.
How much does Allison Margaret O'Leary Williams, MSN, APRN, NP-C prescribe under Medicare Part D?
In 2024, Allison Margaret O'Leary Williams, MSN, APRN, NP-C had 2,692 Medicare Part D claims for 226 beneficiaries; the average among nurse practitioner prescribers was 1,109. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.