Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mark Shearing, LADC

Addiction (Substance Use Disorder) Counselor in Derry, NH · enumerated 2012.

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

National Provider Identifier

1235400565

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Registry record

Entity type Individual (Type 1)

Name Mark Shearing

Credential LADC

Sex Male

Practice address 16 Manning St, Derry, NH, 03038

Phone (603) 231-0214

Enumeration date Jan 18, 2012

Last updated in NPPES Jan 18, 2012

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers Primary

Other identifiers

Identifier	Type	State	Issuer
0839	Other	NH	LICENSED ALCOHOL & DRUG COUNSELOR

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 1235400565 active?

Yes, as of the latest NPPES snapshot, NPI 1235400565 is active (record last updated 2012-01-18).

How do I verify Mark Shearing's NPI record?

Cross-check NPI 1235400565 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 2012-01-18.