Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. William Xavier Kelly, M.A., LMHC, LADC1

Mental Health Counselor in Barnstable, MA · enumerated 2007.

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

National Provider Identifier

1851519441

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Registry record

Entity type Individual (Type 1)

Name Mr. William Xavier Kelly

Credential M.A., LMHC, LADC1

Sex Male

Practice address 275 Millway, Barnstable, MA, 02630

Phone (860) 324-9720

Enumeration date Apr 22, 2007

Last updated in NPPES Mar 9, 2010

Taxonomy & licenses

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 000668 (CT) Secondary

106H00000X Marriage & Family Therapist Behavioral Health & Social Service Providers · License 001149 (CT) Secondary

101YP2500X Professional Counselor Behavioral Health & Social Service Providers · License 001719 (CT) Secondary

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License 7274 (MA) Primary

101YA0400X Addiction (Substance Use Disorder) Counselor Behavioral Health & Social Service Providers · License 2304 (MA) Secondary

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

Where does William Kelly practice?

The practice location on file with NPPES is in Barnstable, MA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Kelly?

The National Provider Identifier (NPI) for William Kelly is 1851519441, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-03-09.