Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Miss Annette C Siemens, FNP

Nurse Practitioner in Denver, CO · enumerated 2006.

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

National Provider Identifier

1477643872

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Registry record

Entity type Individual (Type 1)

Name Miss Annette C Siemens

Credential FNP

Sex Female

Practice address 2880 W Holden Pl, Denver, CO, 80204

Phone (303) 953-6600

Fax (303) 781-4333

Enumeration date Oct 14, 2006

Last updated in NPPES Sep 22, 2023

Taxonomy & licenses

363L00000X Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 197 (AK) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP 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 specialty is Annette Siemens?

Annette Siemens is registered in NPPES with the primary taxonomy of Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-09-22.