Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark A Nelson, LADC

Counselor in Houlton, ME · enumerated 2007.

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

National Provider Identifier

1467598599

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Registry record

Entity type Individual (Type 1)

Name Mark A Nelson

Credential LADC

Sex Male

Practice address 11 Mill St, Houlton, ME, 04730

Phone (207) 532-6523

Fax (207) 532-3873

Enumeration date Jan 29, 2007

Last updated in NPPES Feb 2, 2021

Taxonomy & licenses

101Y00000X Counselor Behavioral Health & Social Service Providers · License LC770 (ME) 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.

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Frequently asked questions

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.

What specialty is Mark Nelson?

Mark Nelson is registered in NPPES with the primary taxonomy of Counselor. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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