DR. JOHN KASSOTIS M.D.
NPI 1598759003
Internal Medicine - Clinical Cardiac Electrophysiology in Riverhead, NY
About Dr. John Kassotis M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JOHN KASSOTIS M.D. (NPI 1598759003) is an individual clinical cardiac electrophysiology provider in Riverhead, New York, licensed in New York (187961-01) and active in the NPI registry since September 2005. He is enrolled in Medicare PECOS, is affiliated with Ns/lij Hs Southside Hospital, and maintains a secondary practice location in Brooklyn.
NPPES Registry Identity
Specialties & Licenses 3
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. John Kassotis M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
3Medicare enrollment records show John Kassotis reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Riverhead, NY 11901
- Reassigned Medicare billing, New York enrollment
- 18 clinicians in this Medicare group
Brooklyn, NY 11203
- Reassigned Medicare billing, New York enrollment
- 291 clinicians in this Medicare group
New Brunswick, NJ 08901
- Reassigned Medicare billing, New Jersey enrollment
- 641 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 10
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 3
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Ns/Lij Hs Southside Hospital
Acute Care Hospitals · Bay Shore, NYPeconic Bay Medical Center
Acute Care Hospitals · Riverhead, NYSuny/Stony Brook University Hospital
Acute Care Hospitals · Stony Brook, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11901 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is John Kassotis's NPI number?
The NPI number for John Kassotis is 1598759003. It was assigned to this individual provider in the NPPES registry on September 12, 2005.
Where is John Kassotis located?
John Kassotis practices at 951 Roanoke Ave, Riverhead, NY 11901. The listed phone number is (631) 369-5005.
What is John Kassotis's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Clinical Cardiac Electrophysiology, with taxonomy code 207RC0001X.
Is John Kassotis enrolled in Medicare?
Yes. John Kassotis is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for John Kassotis's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Kassotis reassigns Medicare benefits to 3 organizations: Peconic Cardiology, PC (Riverhead, NY), University Physicians Of Brooklyn, Inc. (Brooklyn, NY) and Rutgers Health-Rwj Scleroderma Program (New Brunswick, NJ). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for John Kassotis's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does John Kassotis accept?
Health plans from Oscar Health list John Kassotis as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is John Kassotis affiliated with any hospitals?
According to CMS data, John Kassotis is affiliated with Ns/Lij Hs Southside Hospital, Peconic Bay Medical Center and Suny/Stony Brook University Hospital.
When was this NPI record last updated?
The NPPES record for John Kassotis was last updated on April 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Dr. John Kassotis, M.D. · NPI 1598759003
Clinical Cardiac Electrophysiology physician in Riverhead, New York. Individual provider, active in the CMS NPPES registry since September 12, 2005.
## Identity
- **NPI:** 1598759003 (Entity type: Individual)
- **Enumerated:** September 12, 2005
- **Primary specialty:** Internal Medicine - Clinical Cardiac Electrophysiology · taxonomy 207RC0001X
- **State license:** 187961-01 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 951 ROANOKE AVE, Riverhead, NY 11901-2724
- **Phone:** (631) 369-5005 · **Fax:** (631) 369-4994
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): Peconic Cardiology, PC (NPI 1932688629, Riverhead, NY); University Physicians Of Brooklyn, Inc. (NPI 1467409912, Brooklyn, NY); Rutgers Health-Rwj Scleroderma Program (NPI 1215062005, New Brunswick, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 1990
## Record status
- **NPPES last updated:** April 7, 2023
- **Other identifiers:** Medicaid 01755384 (NY)
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Source: [NPI Profile](https://npiprofile.com/npi/1598759003) · Data from the CMS NPPES public registry.