Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Dr. John Christopher Mattos, DMD
Dentist in Longview, WA · enumerated 2019.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1699325795
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Registry record
Entity type Individual (Type 1)
Name Dr. John Christopher Mattos
Credential DMD
Sex Male
Practice address 1452 Hudson St Ste 200, Longview, WA, 98632
Phone (360) 425-9090
Enumeration date Sep 19, 2019
Last updated in NPPES Sep 19, 2019
Taxonomy & licenses
DMD · Doctor of Medicine in Dentistry: A licensed dentist; DMD and DDS are equivalent dental degrees.
About the DMD 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.
Frequently asked questions
Where does John Mattos practice?
The practice location on file with NPPES is in Longview, WA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for John Mattos?
The National Provider Identifier (NPI) for John Mattos is 1699325795, a Type 1 (individual) record in the CMS NPPES registry.
Other providers at this practice address
Browse all →Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2019-09-19.