Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Stephen Mark Henesch, DO

Individual provider Diagnostic Radiology Physician · NPI 1851335863

Stephen Mark Henesch, DO practises Diagnostic Radiology in West Islip, New York. Qualified in 2000, 26 years ago. Practices with Icahn School of Medicine at Mount Sinai, an 18-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in Connecticut and New York.

Years since qualifying
26
Licensed in
CT, NY
In the registry since
2006
Specialties on file
2
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

1000 Montauk Hwy
West Islip, NY 11795-4927
Phone: (631) 376-4027
Fax: (631) 376-4046
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 263 Farmington Ave, Farmington, CT 06030-2803 — (860) 679-2784

Specialties & licences

Diagnostic Radiology Physician (primary) Taxonomy 2085R0202X · Licence 238991 (NY)
Diagnostic Radiology Physician Taxonomy 2085R0202X · Licence 42479 (CT)

Record details

NPI number1851335863
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorNo
NPI enumeratedJune 16, 2006
Last updated in NPPESSeptember 23, 2026
Certification dateSeptember 23, 2026

Medicare enrollment

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

Medicare specialtyDIAGNOSTIC RADIOLOGY
Also practisesPEDIATRIC MEDICINE
Medical schoolOTHER
Graduated 2000 (26 years in practice)
Group practice Icahn School Of Medicine At Mount Sinai — 18 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 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 patients2,486
Services billed 5,108 a service is one billed item, such as a visit, a test or a procedure
Average patient age79

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 Icahn School of Medicine at Mount Sinai

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 18 clinicians in the practice; 12 are shown here.

Other providers in West Islip