Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Stephen B Siegel, M. D.

Urology Physician in Boulder, CO · enumerated 2006.

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

National Provider Identifier

1902860091

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Registry record

Entity type Individual (Type 1)

Name Stephen B Siegel

Credential M. D.

Sex Male

Practice address 2750 Broadway St, Boulder, CO, 80304

Phone (303) 440-3093

Fax (303) 440-3161

Enumeration date Apr 14, 2006

Last updated in NPPES Jul 16, 2019

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 040149 (CT) 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

Is NPI 1902860091 active?

Yes, as of the latest NPPES snapshot, NPI 1902860091 is active (record last updated 2019-07-16).

How do I verify Stephen Siegel's NPI record?

Cross-check NPI 1902860091 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-07-16.