Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Catherine Amy Siman

Physician Assistant in Fort Collins, CO · enumerated 2024.

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

National Provider Identifier

1558129031

Verified

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Registry record

Entity type Individual (Type 1)

Name Catherine Amy Siman

Sex Female

Practice address 1001 E Harmony Rd # A103, Fort Collins, CO, 80525

Phone (970) 237-2239

Enumeration date Mar 11, 2024

Last updated in NPPES Feb 26, 2025

Taxonomy & licenses

390200000X Student in an Organized Health Care Education/Training Program Student, Health Care Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA.0008653 (CO) Primary

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 NPI 1558129031 active?

Yes, as of the latest NPPES snapshot, NPI 1558129031 is active (record last updated 2025-02-26).

How do I verify Catherine Siman's NPI record?

Cross-check NPI 1558129031 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-02-26.