Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Themistoklis J Nissirios, MD

Individual provider Cardiovascular Disease Physician · NPI 1194925370

Dr. Themistoklis J Nissirios, MD is registered under Cardiovascular Disease (Cardiology) in Monroe, New York. Graduated from Rutgers R W Johnson Medical School (CAM/NEW Bruns/Pisc) in 2003, 23 years ago. Practices with Valley Physician Services PC, a 592-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
23
Trained at
Rutgers R W Johnson Medical School (CAM/NEW Bruns/Pisc)
Licensed in
NY
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

855 State Route 17M
Monroe, NY 10950-1600
Phone: (845) 703-6999
Fax: (845) 703-6297
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence 253483 (NY)

Record details

NPI number1194925370
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 25, 2007
Last updated in NPPESOctober 12, 2020
Certification dateOctober 12, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyCARDIOVASCULAR DISEASE (CARDIOLOGY)
Also practisesINTERNAL MEDICINE
Medical schoolRUTGERS R W JOHNSON MEDICAL SCHOOL (CAM/NEW BRUNS/PISC)
Graduated 2003 (23 years in practice)
Group practice Valley Physician Services Pc — 592 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations3 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients835
Services billed 3,818 a service is one billed item, such as a visit, a test or a procedure
Average patient age76

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Valley Physician Services PC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 592 clinicians in the practice; 12 are shown here.

Other providers in Monroe