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Nathan Diaz, MS, RD, LDN

Registered Dietitian in Boston, MA · enumerated 2017 · practices at Eric J Roseen Dc LLC.

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

National Provider Identifier

1487178851

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Registry record

Entity type Individual (Type 1)
Name Nathan Diaz
Credential MS, RD, LDN
Sex Male
Practice address 654 Beacon St, Boston, MA, 02215
Phone (617) 536-1161
Enumeration date Jul 27, 2017
Last updated in NPPES Mar 17, 2018

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers · License 4284 (MA) Primary
RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration. About the RD credential

Other identifiers

Identifier Type State Issuer
86067011 Other - COMMISSION ON DIETETIC REGISTRATION
4284 Other MA REGISTERED DIETITIAN STATE LICENSE

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.

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Frequently asked questions

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.
What specialty is Nathan Diaz?
Nathan Diaz 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-03-17.