Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Nathan Thomas Mortensen, D.O.

Diagnostic Radiology Physician in San Francisco, CA · enumerated 2012.

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

National Provider Identifier

1679825400

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Nathan Thomas Mortensen

Credential D.O.

Sex Male

Practice address 505 Parnassus Ave Fl 3, San Francisco, CA, 94143

Phone (415) 476-1537

Fax (415) 476-0616

Enumeration date Oct 3, 2012

Last updated in NPPES Oct 6, 2025

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License A87377 (CA) Secondary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 24382 (CA) Primary

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License DO187083 (OR) Secondary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
R202268	Other	-	MEDICARE
500745314	Medicaid	OR	-

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 Nathan Mortensen's NPI record?

Cross-check NPI 1679825400 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1679825400 active?

Yes, as of the latest NPPES snapshot, NPI 1679825400 is active (record last updated 2025-10-06).

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-06.