NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

John S. Westerdahl, MD

Dermatology Physician in Salt Lake City, UT · enumerated 2022.

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

National Provider Identifier

1831849934

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name John S. Westerdahl
Credential MD
Sex Male
Practice address Helix: 30 N Mario Capecchi Rm 1s100, Salt Lake City, UT, 84112
Phone (801) 581-2121
Enumeration date Mar 24, 2022
Last updated in NPPES Aug 9, 2023

Taxonomy & licenses

207N00000X Dermatology Physician Allopathic & Osteopathic Physicians · License 13510322-1205 (UT) 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

How do I verify John Westerdahl's NPI record?
Cross-check NPI 1831849934 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1831849934 active?
Yes, as of the latest NPPES snapshot, NPI 1831849934 is active (record last updated 2023-08-09).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-08-09.