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

Dr. James Jun Yoon, MD

Individual provider Internal Medicine Physician · NPI 1669903548

Dr. James Jun Yoon, MD practises Hematology/Oncology in New York, New York. Graduated from Icahn School of Medicine at Mount Sinai in 2017, 9 years ago. Practices with Memorial Hematology Lymphoma Group, a 216-clinician group and accepts Medicare assignment. Licensed in New York.

Years since qualifying
9
Trained at
Icahn School of Medicine at Mount Sinai
Licensed in
NY
In the registry since
2017
Specialties on file
3
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

1275 York Ave
New York, NY 10065-6007
Phone: (212) 639-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Oncology Physician (primary) Taxonomy 207RX0202X · Licence 329655 (NY)
Internal Medicine Physician Taxonomy 207R00000X · Licence 329655 (NY)
Hematology (Internal Medicine) Physician Taxonomy 207RH0000X · Licence 329655 (NY)

Record details

NPI number1669903548
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedMarch 23, 2017
Last updated in NPPESAugust 1, 2024
Certification dateAugust 1, 2024

Medicare enrollment

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

Medicare specialtyHEMATOLOGY/ONCOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolICAHN SCHOOL OF MEDICINE AT MOUNT SINAI
Graduated 2017 (9 years in practice)
Group practice Memorial Hematology Lymphoma Group — 216 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 patients89
Services billed 436 a service is one billed item, such as a visit, a test or a procedure
Average patient age75

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.

Also affiliated with 1 hospital, which CMS identifies by certification number only.

Colleagues at Memorial Hematology Lymphoma Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 216 clinicians in the practice; 12 are shown here.

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