Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Katie Callene Masters, PA-C

Physician Assistant in Castle Rock, CO · enumerated 2016.

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

National Provider Identifier

1659822930

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Registry record

Entity type Individual (Type 1)

Name Mrs. Katie Callene Masters

Credential PA-C

Sex Female

Practice address 4386 Trail Boss Dr, Castle Rock, CO, 80104

Phone (303) 688-8666

Fax (303) 688-8260

Enumeration date Oct 20, 2016

Last updated in NPPES Apr 11, 2019

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 0004784 (CO) Primary

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

What is the NPI number for Katie Masters?

The National Provider Identifier (NPI) for Katie Masters is 1659822930, a Type 1 (individual) record in the CMS NPPES registry.

Where does Katie Masters practice?

The practice location on file with NPPES is in Castle Rock, CO. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-04-11.