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

Dr. Hiram Great Diaz Diaz, CRNA

Certified Registered Nurse Anesthetist in Anaheim, CA · enumerated 2020.

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

National Provider Identifier

1821600420

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Registry record

Entity type Individual (Type 1)

Name Dr. Hiram Great Diaz Diaz

Credential CRNA

Sex Male

Practice address Anaheim, CA, 92807

Phone (949) 257-5734

Enumeration date Aug 17, 2020

Last updated in NPPES Sep 20, 2023

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

Taxonomy & licenses

163WC0200X Critical Care Medicine Registered Nurse Nursing Service Providers · License 95066307 (CA) Secondary

367500000X Certified Registered Nurse Anesthetist Physician Assistants & Advanced Practice Nursing Providers · License 95002190 (CA) Primary

CRNA · Certified Registered Nurse Anesthetist: An advanced practice nurse specializing in anesthesia care. About the CRNA 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 Hiram Diaz Diaz?

The National Provider Identifier (NPI) for Hiram Diaz Diaz is 1821600420, a Type 1 (individual) record in the CMS NPPES registry.

Where does Hiram Diaz Diaz practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-20.