NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Matthew Massaro, DO

Hospitalist Physician in Dover, DE · enumerated 2006.

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

National Provider Identifier

1710069943

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Matthew Massaro
Credential DO
Sex Male
Practice address Dover, DE, 19901
Phone (302) 744-7581
Fax (302) 744-7332
Enumeration date Oct 19, 2006
Last updated in NPPES Jul 5, 2022

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OS013166 (PA) Secondary
208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License C2-0013015 (DE) Primary
DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO 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 1710069943 active?
Yes, as of the latest NPPES snapshot, NPI 1710069943 is active (record last updated 2022-07-05).
How do I verify Matthew Massaro's NPI record?
Cross-check NPI 1710069943 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-05.