Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Angela Claire Biesen, D.O.

Internal Medicine Physician in Fountain Valley, CA · enumerated 2016.

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

National Provider Identifier

1699121491

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Registry record

Entity type Individual (Type 1)

Name Angela Claire Biesen

Credential D.O.

Sex Female

Practice address 9900 Talbert Ave Ste 301, Fountain Valley, CA, 92708

Phone (714) 965-2500

Fax (714) 965-2583

Enumeration date May 11, 2016

Last updated in NPPES May 30, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 20A16223 (CA) Primary

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

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

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Angela Biesen?

Angela Biesen is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-05-30.