Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Nunzio Masotto, M.D.

Q: What is the NPI number for Mark Masotto?

The National Provider Identifier (NPI) for Mark Masotto is 1033118336, a Type 1 (individual) record in the CMS NPPES registry.

Diagnostic Radiology Physician in Orange, CA · enumerated 2005.

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

National Provider Identifier

1033118336

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Registry record

Entity type Individual (Type 1)

Name Mark Nunzio Masotto

Credential M.D.

Sex Male

Practice address 431 S Batavia St, Ste. 103, Orange, CA, 92868

Phone (714) 538-6731

Fax (714) 771-8369

Enumeration date Jul 19, 2005

Last updated in NPPES Aug 15, 2008

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License A61275 (CA) Primary

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

Other identifiers

Identifier	Type	State	Issuer
00A612750	Medicaid	CA	-
300136609	Other	-	RAILROAD MEDICARE
00A612750 159	Other	-	CALOPTIMA
00A612750	Other	-	BLUE SHIELD OF CA
053304CH71589	Other	-	TRAILBLAZER

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 Mark Masotto?

The National Provider Identifier (NPI) for Mark Masotto is 1033118336, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Masotto practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-08-15.