Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Aaron Collier

Mental Health Counselor in Marshfield, MA · enumerated 2025 · practices at Massbay Counseling,Inc..

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

National Provider Identifier

1386456986

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Registry record

Entity type Individual (Type 1)

Name Aaron Collier

Sex Male

Practice address 541 Plain St, Marshfield, MA, 02050

Phone (781) 834-0747

Enumeration date Jan 22, 2025

Last updated in NPPES Jan 22, 2025

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers 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 Aaron Collier?

Aaron Collier is registered in NPPES with the primary taxonomy of Mental Health 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.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-01-22.