Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Marc O Griofa, MD PHD

Public Health & General Preventive Medicine Physician in Las Vegas, NV · enumerated 2020.

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

National Provider Identifier

1427666015

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Registry record

Entity type Individual (Type 1)

Name Dr. Marc O Griofa

Credential MD PHD

Sex Male

Practice address 1581 N Main St, Las Vegas, NV, 89101

Phone (702) 229-4732

Enumeration date Jul 20, 2020

Last updated in NPPES Jul 20, 2020

Taxonomy & licenses

2083P0901X Public Health & General Preventive Medicine Physician Allopathic & Osteopathic Physicians · License 272448 (NV) 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

Where does Marc O Griofa practice?

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

What is the NPI number for Marc O Griofa?

The National Provider Identifier (NPI) for Marc O Griofa is 1427666015, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-07-20.