DR. JAMES JUN YOON M.D.
NPI 1669903548
Internal Medicine - Medical Oncology in New York, NY
About Dr. James Jun Yoon M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JAMES JUN YOON M.D. (NPI 1669903548) is an individual medical oncology provider in New York, New York, licensed in New York (329655) and active in the NPI registry since March 2017. He is enrolled in Medicare PECOS, is affiliated with Beth Israel Deaconess Medical Center, and is a graduate of Icahn School Of Medicine At Mount Sinai (2017).
NPPES Registry Identity
Specialties & Licenses 3
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. James Jun Yoon 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 James Yoon reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New York, NY 10065
- Reassigned Medicare billing, New York enrollment
- 428 clinicians in this Medicare group
New York, NY 10065
- Reassigned Medicare billing, New York enrollment
- 248 clinicians in this Medicare group
Boston, MA 02215
- Reassigned Medicare billing, Massachusetts enrollment
- 2,579 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 3
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Beth Israel Deaconess Medical Center
Acute Care Hospitals · Boston, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10065 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.
NEW YORK, NY 10065
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 James Yoon's NPI number?
The NPI number for James Yoon is 1669903548. It was assigned to this individual provider in the NPPES registry on March 23, 2017.
Where is James Yoon located?
James Yoon practices at 1275 York Ave, New York, NY 10065. The listed phone number is (212) 639-2000.
What is James Yoon's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is James Yoon enrolled in Medicare?
Yes. James Yoon 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 James Yoon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Yoon reassigns Medicare benefits to 3 organizations: Memorial Hematology Lymphoma Group (New York, NY), Mskcc Clinical Practice Plan (New York, NY) and Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (Boston, MA). 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 James Yoon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is James Yoon affiliated with any hospitals?
According to CMS data, James Yoon is affiliated with Beth Israel Deaconess Medical Center.
When was this NPI record last updated?
The NPPES record for James Yoon was last updated on August 1, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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. James Jun Yoon, M.D. · NPI 1669903548
Medical Oncology physician in New York, New York. Individual provider, active in the CMS NPPES registry since March 23, 2017.
## Identity
- **NPI:** 1669903548 (Entity type: Individual)
- **Enumerated:** March 23, 2017
- **Primary specialty:** Internal Medicine - Medical Oncology · taxonomy 207RX0202X
- **State license:** 329655 (New York)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1275 YORK AVE, New York, NY 10065-6007
- **Phone:** (212) 639-2000
## 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): Memorial Hematology Lymphoma Group (NPI 1891766366, New York, NY); Mskcc Clinical Practice Plan (NPI 1306096508, New York, NY); Harvard Medical Faculty Phys At Beth Israel Deaconess Med Ctr Inc (NPI 1194765438, Boston, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Icahn School Of Medicine At Mount Sinai, class of 2017
## Record status
- **NPPES last updated:** August 1, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1669903548) · Data from the CMS NPPES public registry.