Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Charles S. Marn, M.D.

Diagnostic Radiology Physician in Milwaukee, WI · enumerated 2006.

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

National Provider Identifier

1275558553

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Registry record

Entity type Individual (Type 1)

Name Mr. Charles S. Marn

Credential M.D.

Sex Male

Practice address 9200 W Wisconsin Ave, Department of Radiology, Milwaukee, WI, 53226

Phone (414) 805-3700

Fax (414) 805-3777

Enumeration date Jul 13, 2006

Last updated in NPPES Jun 13, 2013

Taxonomy & licenses

2085R0202X Diagnostic Radiology Physician Allopathic & Osteopathic Physicians · License 49371 (WI) 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
1275558553	Medicaid	WI	-

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 1275558553 active?

Yes, as of the latest NPPES snapshot, NPI 1275558553 is active (record last updated 2013-06-13).

How do I verify Charles Marn's NPI record?

Cross-check NPI 1275558553 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 2013-06-13.