Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Melissa J Rosin, M.D.

Pediatrics Physician in Tustin, CA · enumerated 2006.

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

National Provider Identifier

1942399589

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Registry record

Entity type Individual (Type 1)

Name Melissa J Rosin

Credential M.D.

Sex Female

Practice address 1451 Irvine Blvd, Tustin, CA, 92780

Phone (714) 838-8878

Fax (714) 838-8988

Enumeration date Oct 12, 2006

Last updated in NPPES Nov 4, 2016

Taxonomy & licenses

208000000X Pediatrics Physician Allopathic & Osteopathic Physicians · License A77805 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 1942399589 active?

Yes, as of the latest NPPES snapshot, NPI 1942399589 is active (record last updated 2016-11-04).

How do I verify Melissa Rosin's NPI record?

Cross-check NPI 1942399589 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 2016-11-04.