Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William David Koltun, MD

Gynecology Physician in San Diego, CA · enumerated 2005.

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

National Provider Identifier

1124010483

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Registry record

Entity type Individual (Type 1)

Name Dr. William David Koltun

Credential MD

Sex Male

Practice address 9040 Friars Rd, Suite 540, San Diego, CA, 92108

Phone (619) 521-2830

Fax (619) 521-2830

Enumeration date Aug 22, 2005

Last updated in NPPES Jul 13, 2026

Taxonomy & licenses

207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License A030767 (CA) 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

Where does William Koltun practice?

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

What is the NPI number for William Koltun?

The National Provider Identifier (NPI) for William Koltun is 1124010483, a Type 1 (individual) record in the CMS NPPES registry.

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