Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Massachusetts General Hospital

Q: What is the NPI number for Massachusetts General Hospital?

The NPI for Massachusetts General Hospital is 1699908756, a Type 2 (organization) record in the CMS NPPES registry.

Clinical Social Worker in Charlestown, MA · enumerated 2009 · authorized official Lorenzo Lewis, Medical Director.

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

National Provider Identifier

1699908756

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Registry record

Entity type Organization (Type 2)

Legal business name Massachusetts General Hospital

Practice address 73 High St. Charlestown, Ma., Charlestown, MA, 02129

Phone (617) 724-9317

Fax (617) 726-3514

Enumeration date Aug 24, 2009

Last updated in NPPES Aug 24, 2009

Taxonomy & classification

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 1020597 (MA) Primary

Authorized official

Name Lorenzo Lewis

Title Medical Director

Phone (617) 724-8227

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 is the NPI number for Massachusetts General Hospital?

The NPI for Massachusetts General Hospital is 1699908756, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for Massachusetts General Hospital?

NPPES lists Lorenzo Lewis (Medical Director) as the authorized official for this organization.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-08-24.