Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Sara Mattillion, RDN, LDN

Registered Dietitian in Rockford, IL · enumerated 2020.

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

National Provider Identifier

1336758903

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Registry record

Entity type Individual (Type 1)

Name Sara Mattillion

Credential RDN, LDN

Sex Female

Practice address 930 Winthrop Ln, Rockford, IL, 61107

Phone (708) 567-3763

Enumeration date Jul 29, 2020

Last updated in NPPES Jul 29, 2020

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers Primary

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

Where does Sara Mattillion practice?

The practice location on file with NPPES is in Rockford, IL. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Sara Mattillion?

The National Provider Identifier (NPI) for Sara Mattillion is 1336758903, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-07-29.