Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Jonathan Grecco

Internal Medicine Physician in Norwalk, CT · enumerated 2020.

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

National Provider Identifier

1457988990

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Registry record

Entity type Individual (Type 1)

Name Jonathan Grecco

Sex Male

Practice address 40 Cross St Ste 200a, Norwalk, CT, 06851

Phone (203) 852-2740

Enumeration date Mar 25, 2020

Last updated in NPPES Jun 24, 2026

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 83056 (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

What is the NPI number for Jonathan Grecco?

The National Provider Identifier (NPI) for Jonathan Grecco is 1457988990, a Type 1 (individual) record in the CMS NPPES registry.

Where does Jonathan Grecco practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-24.