Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Ilisa Spitzer Nussbaum, R.D.

Registered Dietitian in New Haven, CT · enumerated 2013.

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

National Provider Identifier

1255777926

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Registry record

Entity type Individual (Type 1)

Name Ms. Ilisa Spitzer Nussbaum

Credential R.D.

Sex Female

Practice address 20 York St, Ynhh Nutrition Clinic - Cbb 52, New Haven, CT, 06510

Phone (203) 688-2422

Enumeration date May 21, 2013

Last updated in NPPES May 21, 2013

Taxonomy & licenses

133V00000X Registered Dietitian Dietary & Nutritional Service Providers Primary

RD · Registered Dietitian: A nutrition professional credentialed by the Commission on Dietetic Registration. About the RD credential

Other identifiers

Identifier	Type	State	Issuer
C02658	Other	CT	YNHH MEDICARE NUMBER

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

What specialty is Ilisa Nussbaum?

Ilisa Nussbaum 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-05-21.