NPI Portal NPI Lookup & Verification

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

Joseph J Marous III, MD

Diagnostic Radiology Physician in Muskegon, MI · enumerated 2006.

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

National Provider Identifier

1942212667

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Registry record

Entity type Individual (Type 1)
Name Joseph J Marous III
Credential MD
Sex Male
Practice address Muskegon, MI, 49440
Phone (231) 722-6005
Fax (231) 726-2804
Enumeration date Aug 12, 2006
Last updated in NPPES Nov 2, 2012

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

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 4301056368 (MI) 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
P00157198 Other MI RR MEDICARE
4661876100 Medicaid MI -

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.

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Frequently asked questions

Is NPI 1942212667 active?
Yes, as of the latest NPPES snapshot, NPI 1942212667 is active (record last updated 2012-11-02).
How do I verify Joseph Marous's NPI record?
Cross-check NPI 1942212667 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 2012-11-02.