NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Christopher R Sierk, D.D.S.

Orthodontics and Dentofacial Orthopedics Dentistry in Tigard, OR · enumerated 2008.

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

National Provider Identifier

1104001106

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Registry record

Entity type Individual (Type 1)
Name Christopher R Sierk
Credential D.D.S.
Sex Male
Practice address Tigard, OR, 97223
Phone (503) 620-6606
Fax (503) 624-6382
Enumeration date Jan 8, 2008
Last updated in NPPES Jan 8, 2008

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

1223X0400X Orthodontics and Dentofacial Orthopedics Dentistry Dental Providers · License D7192 (OR) Primary
DDS · Doctor of Dental Surgery: A licensed dentist; DDS and DMD are equivalent dental degrees. About the DDS 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.

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Frequently asked questions

How do I verify Christopher Sierk's NPI record?
Cross-check NPI 1104001106 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.
Is NPI 1104001106 active?
Yes, as of the latest NPPES snapshot, NPI 1104001106 is active (record last updated 2008-01-08).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-01-08.