Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Stephanie Ann Massaro, M.D., M.P.H.

Pediatric Hematology & Oncology Physician in New Haven, CT · enumerated 2009.

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

National Provider Identifier

1851534481

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Registry record

Entity type Individual (Type 1)

Name Dr. Stephanie Ann Massaro

Credential M.D., M.P.H.

Sex Female

Practice address 333 Cedar St, Lmp 2073, New Haven, CT, 06520

Phone (203) 785-4640

Fax (203) 737-2228

Enumeration date Apr 13, 2009

Last updated in NPPES Apr 13, 2009

Taxonomy & licenses

2080P0207X Pediatric Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 047534 (CT) 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 1851534481 active?

Yes, as of the latest NPPES snapshot, NPI 1851534481 is active (record last updated 2009-04-13).

How do I verify Stephanie Massaro's NPI record?

Cross-check NPI 1851534481 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 2009-04-13.