Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum
Justin Mattson, RD/LD
Registered Dietitian in Colby, KS · enumerated 2025.
Data current as of Jul 13, 2026 · sourced from CMS NPPES
National Provider Identifier
1023987260
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Registry record
Entity type Individual (Type 1)
Name Justin Mattson
Credential RD/LD
Sex Male
Practice address 1442 County Road R, Colby, KS, 67701
Phone (818) 434-3331
Enumeration date Nov 4, 2025
Last updated in NPPES Nov 4, 2025
Taxonomy & licenses
133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 5340 (AL) Secondary
RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration.
About the RD 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
What specialty is Justin Mattson?
Justin Mattson is registered in NPPES with the primary taxonomy of Registered Dietitian. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.
Is this the official NPI registry?
No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.
Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-04.