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

Catherine Joy Diehl, MS, CNS

Nutritionist in Trumbull, CT · enumerated 2022.

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

National Provider Identifier

1477201820

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Catherine Joy Diehl

Credential MS, CNS

Sex Female

Practice address Trumbull, CT, 06611

Phone (203) 858-4615

Enumeration date Mar 15, 2022

Last updated in NPPES Mar 15, 2022

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

Taxonomy & licenses

133N00000X Nutritionist Dietary & Nutritional Service Providers · License CNS18138 (CT) 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

How do I verify Catherine Diehl's NPI record?

Cross-check NPI 1477201820 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1477201820 active?

Yes, as of the latest NPPES snapshot, NPI 1477201820 is active (record last updated 2022-03-15).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-03-15.