Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas P. Kaegi, M.D.

Internal Medicine Physician in Concord, MA · enumerated 2005 · practices at Atrius Health Inc. Dba Harvard Vanguard Medical Associates.

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

National Provider Identifier

1578552121

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Registry record

Entity type Individual (Type 1)

Name Thomas P. Kaegi

Credential M.D.

Sex Male

Practice address 330 Baker Ave, Concord, MA, 01742

Phone (978) 287-9350

Fax (978) 287-9358

Enumeration date Oct 17, 2005

Last updated in NPPES Nov 16, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 79435 (MA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1004840	Medicaid	VT	-
3127427	Medicaid	MA	-

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 1578552121 active?

Yes, as of the latest NPPES snapshot, NPI 1578552121 is active (record last updated 2020-11-16).

How do I verify Thomas Kaegi's NPI record?

Cross-check NPI 1578552121 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 2020-11-16.