Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Thomas M. Karoff, DO

Internal Medicine Physician in Mt Kisco, NY · enumerated 2007 · practices at Ameripath New York LLC.

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

National Provider Identifier

1366642142

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Registry record

Entity type Individual (Type 1)

Name Thomas M. Karoff

Credential DO

Sex Male

Practice address 110 S. Bedford Rd, Caremount Medical, PC, Mt Kisco, NY, 10549

Phone (914) 241-1050

Fax (914) 242-1516

Enumeration date Jul 20, 2007

Last updated in NPPES Feb 13, 2017

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 243062 (NY) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
GHI HMO	Other	NY	000000121748
10127885	Other	NY	CDPHP
3000976	Other	NY	MVP HEALTHPLAN PIN
1686642	Other	NY	AETNA PPO
071120000022	Other	-	FIDELIS CARE OF NY
3685Q1	Other	NY	EMPIRE BCBS PROVIDER ID #
9633076	Other	NY	AETNA HMO

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

How do I verify Thomas Karoff's NPI record?

Cross-check NPI 1366642142 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366642142 active?

Yes, as of the latest NPPES snapshot, NPI 1366642142 is active (record last updated 2017-02-13).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-13.