Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. William Walker, M.D.

Aerospace Medicine Physician in Vail, AZ · enumerated 2006.

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

National Provider Identifier

1457321192

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Dr. William Walker

Credential M.D.

Sex Male

Practice address Vail, AZ, 85641

Phone (520) 975-7083

Enumeration date Jan 25, 2006

Last updated in NPPES May 29, 2013

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

2083A0100X Aerospace Medicine Physician Allopathic & Osteopathic Physicians · License 01059020A (IN) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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

What is the NPI number for William Walker?

The National Provider Identifier (NPI) for William Walker is 1457321192, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Walker practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-05-29.