Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark D. Stephens, CSAC

Addiction (Substance Use Disorder) Counselor in Marinette, WI · enumerated 2007.

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

National Provider Identifier

1134319452

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Mark D. Stephens

Credential CSAC

Sex Male

Practice address 1409 Cleveland Ave, Marinette, WI, 54143

Phone (920) 496-4700

Enumeration date Aug 1, 2007

Last updated in NPPES Feb 16, 2021

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 15369-131 (WI) 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 specialty is Mark Stephens?

Mark Stephens is registered in NPPES with the primary taxonomy of Addiction (Substance Use Disorder) Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-02-16.