Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Thomas S Pacheco, PA

Physician Assistant in Waltham, MA · enumerated 2006.

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

National Provider Identifier

1780654491

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Registry record

Entity type Individual (Type 1)

Name Mr. Thomas S Pacheco

Credential PA

Sex Male

Practice address 840 Winter St, Waltham, MA, 02451

Phone (781) 890-2133

Fax (781) 890-2177

Enumeration date Jan 25, 2006

Last updated in NPPES Jan 8, 2024

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License 1627 (MA) Primary

PA · Physician Assistant: A licensed clinician who practices medicine in collaboration with physicians, trained in a graduate PA program. About the PA credential

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 Thomas Pacheco?

Thomas Pacheco is registered in NPPES with the primary taxonomy of Physician Assistant. 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 2024-01-08.