NPI Portal NPI Lookup & Verification

Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marcus I O'Neil

Health Educator in Detroit, MI · enumerated 2021.

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

National Provider Identifier

1598335804

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)
Name Marcus I O'Neil
Sex Male
Practice address 3031 W Grand Blvd Ste 531, Detroit, MI, 48202
Phone (313) 664-0100
Fax (313) 664-0111
Enumeration date Jun 29, 2021
Last updated in NPPES May 1, 2023

Taxonomy & licenses

174H00000X Health Educator Other Service Providers 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

What is the NPI number for Marcus O'Neil?
The National Provider Identifier (NPI) for Marcus O'Neil is 1598335804, a Type 1 (individual) record in the CMS NPPES registry.
Where does Marcus O'Neil practice?
The practice location on file with NPPES is in Detroit, MI. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-05-01.