Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mrs. Maryann Felicia Massillio, MPS,RDN,CDN,FAND

Nutritionist in Middletown, NY · enumerated 2018.

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

National Provider Identifier

1750874079

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Registry record

Entity type Individual (Type 1)

Name Mrs. Maryann Felicia Massillio

Credential MPS,RDN,CDN,FAND

Sex Female

Practice address 75 Crystal Run Rd Ste 201, Middletown, NY, 10941

Phone (845) 692-4391

Enumeration date Jun 11, 2018

Last updated in NPPES Jun 11, 2018

Taxonomy & licenses

133N00000X Nutritionist Dietary & Nutritional Service Providers Primary

Other identifiers

Identifier	Type	State	Issuer
390200000X	Other	NY	NUTRITIONIST

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

Is NPI 1750874079 active?

Yes, as of the latest NPPES snapshot, NPI 1750874079 is active (record last updated 2018-06-11).

How do I verify Maryann Massillio's NPI record?

Cross-check NPI 1750874079 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-06-11.