Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
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Dr. Ryan Patrick Casarella, MD

Individual provider Emergency Medicine Physician · NPI 1740643998

Dr. Ryan Patrick Casarella, MD practises Emergency Medicine in Greenwich, Connecticut. Graduated from University of Massachusetts Medical School in 2016, 10 years ago. Practices with Greenwich Hospital, a 79-clinician group and accepts Medicare assignment. Licensed in Nevada and New York.

Years since qualifying
10
Trained at
University of Massachusetts Medical School
Licensed in
NV, NY
In the registry since
2016
Specialties on file
2
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

5 Perryridge Rd
Greenwich, CT 06830-4697
Phone: (203) 863-3000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Emergency Medicine Physician (primary) Taxonomy 207P00000X · Licence 314567-01 (NY)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 19025 (NV)

Record details

NPI number1740643998
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 4, 2016
Last updated in NPPESFebruary 11, 2025
Certification dateFebruary 11, 2025

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF MASSACHUSETTS MEDICAL SCHOOL
Graduated 2016 (10 years in practice)
Group practice Greenwich Hospital — 79 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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 patients394
Services billed 492 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

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.

Colleagues at Greenwich Hospital

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 79 clinicians in the practice; 12 are shown here.

Other providers in Greenwich