Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. John Kassotis, M.D.

Clinical Cardiac Electrophysiology Physician in Riverhead, NY · enumerated 2005.

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

National Provider Identifier

1598759003

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Registry record

Entity type Individual (Type 1)

Name Dr. John Kassotis

Credential M.D.

Sex Male

Practice address 951 Roanoke Ave, Riverhead, NY, 11901

Phone (631) 369-5005

Fax (631) 369-4994

Enumeration date Sep 12, 2005

Last updated in NPPES Apr 7, 2023

Taxonomy & licenses

207RA0001X Advanced Heart Failure and Transplant Cardiology Physician Allopathic & Osteopathic Physicians · License 187961-01 (NY) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 187961-1 (NY) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 25MA07553100 (NJ) Secondary

207RC0001X Clinical Cardiac Electrophysiology Physician Allopathic & Osteopathic Physicians · License 187961-01 (NY) 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
01755384	Medicaid	NY	-

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

Where does John Kassotis practice?

The practice location on file with NPPES is in Riverhead, NY. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for John Kassotis?

The National Provider Identifier (NPI) for John Kassotis is 1598759003, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

Browse all →

Miguel Blanco Cardiovascular Disease Physician · Riverhead, NY NPI 1235127861 Rameshchandra Dabhi Cardiovascular Disease Physician · Riverhead, NY NPI 1033107677 Patrick Valentino Cardiovascular Disease Physician · Riverhead, NY NPI 1669460226 Prateek Dalal Cardiovascular Disease Physician · Riverhead, NY NPI 1184612723 Rajoo Patel Cardiovascular Disease Physician · Riverhead, NY NPI 1568450062 Steven Lederman Cardiovascular Disease Physician · Riverhead, NY NPI 1265420764 Denise Spielman Medical Physician Assistant · Riverhead, NY NPI 1760472468 Michelina Sundberg Medical Physician Assistant · Riverhead, NY NPI 1669462370

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2023-04-07.