Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Allison Margaret O'Leary Williams, MSN, APRN, NP-C

Nurse Practitioner in Greeley, CO · enumerated 2018.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1902376007

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Allison Margaret O'Leary Williams

Credential MSN, APRN, NP-C

Sex Female

Practice address 1010 A St, Greeley, CO, 80631

Phone (970) 313-0400

Fax (970) 313-0404

Enumeration date Nov 30, 2018

Last updated in NPPES Jun 30, 2021

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 994420 (CO) Primary

APRN · Advanced Practice Registered Nurse: An umbrella credential covering NPs, CRNAs, CNMs, and clinical nurse specialists. About the APRN credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1902376007 active?

Yes, as of the latest NPPES snapshot, NPI 1902376007 is active (record last updated 2021-06-30).

How do I verify Allison Williams's NPI record?

Cross-check NPI 1902376007 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Carolyn Bottone-Post Advanced Practice Midwife · Greeley, CO NPI 1619935996 Teresa Loftin Family Medicine Physician · Greeley, CO NPI 1306872445 Patty Beecroft Family Medicine Physician · Greeley, CO NPI 1104991496 Samuel Davis Family Medicine Physician · Greeley, CO NPI 1336407758 Bryce Spitze Family Medicine Physician · Greeley, CO NPI 1780095141 Sunrise Community Health Federally Qualified Health Center (FQHC) · Greeley, CO NPI 1205236072 Chelsea Maier Physician Assistant · Greeley, CO NPI 1184107690 Matthew Hubbard Medical Physician Assistant · Greeley, CO NPI 1457085995

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-06-30.