Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Ian Matthew Cheslock
Optometrist in Longview, WA · enumerated 2021.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1003580762
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Registry record
Entity type Individual (Type 1)
Name Ian Matthew Cheslock
Sex Male
Practice address 950 11th Ave, Longview, WA, 98632
Phone (360) 577-1500
Fax (360) 425-0735
Enumeration date Aug 5, 2021
Last updated in NPPES Aug 5, 2021
Taxonomy & licenses
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
What is the NPI number for Ian Cheslock?
The National Provider Identifier (NPI) for Ian Cheslock is 1003580762, a Type 1 (individual) record in the CMS NPPES registry.
Where does Ian Cheslock practice?
The practice location on file with NPPES is in Longview, WA. Providers can have multiple locations; NPPES lists the primary practice address.
Other providers at this practice address
Browse all → William Cheslock Optometrist · Longview, WA NPI 1649368200 John Cheslock Optometrist · Longview, WA NPI 1790873370 Cascade Eye Care Ps Optometrist · Longview, WA NPI 1396815585 George Obermeyer Hearing Instrument Specialist · Longview, WA NPI 1801910161 Ireatha Schrepel Hearing Instrument Specialist · Longview, WA NPI 1194152603 Obermeyer & Schrepel Hearing Aid Specialist LLC Hearing Instrument Specialist · Longview, WA NPI 1033549951 Brandon Malmstadt Optometrist · Longview, WA NPI 1962102947 Hanna Badger Optometrist · Longview, WA NPI 1790577880
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-08-05.