JOSEPH YOUNGHUN YOON MD, MSC, MAED
NPI 1861982985
Psychiatry & Neurology - Neurocritical Care in Boston, MA
About Joseph Younghun Yoon Md, Msc, Maed NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOSEPH YOUNGHUN YOON MD, MSC, MAED (NPI 1861982985) is an individual neurocritical care provider in Boston, Massachusetts, licensed in New York (315449) and active in the NPI registry since May 2018. He is enrolled in Medicare PECOS, is affiliated with Mount Sinai South Nassau, and maintains 2 additional practice locations.
NPPES Registry Identity
Specialties & Licenses 5
Other Names 1
Secondary Practice Locations 2
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
Joseph Younghun Yoon Md, Msc, Maed 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
2Medicare enrollment records show Joseph Yoon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Elmhurst, NY 11373
- Reassigned Medicare billing, New York enrollment
- 836 clinicians in this Medicare group
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 329 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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Mount Sinai South Nassau
Acute Care Hospitals · Oceanside, NYOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
BOSTON, MA 02114
BOSTON, MA 02114
BOSTON, MA 02114
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 Joseph Yoon's NPI number?
The NPI number for Joseph Yoon is 1861982985. It was assigned to this individual provider in the NPPES registry on May 14, 2018. The provider is also known as Younghun Yoon MD, Msc, Maed.
Where is Joseph Yoon located?
Joseph Yoon practices at 55 Fruit St, Boston, MA 02114. The listed phone number is (617) 643-0596.
What is Joseph Yoon's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Neurocritical Care, with taxonomy code 2084A2900X.
Is Joseph Yoon enrolled in Medicare?
Yes. Joseph 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 Joseph Yoon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Joseph Yoon reassigns Medicare benefits to 2 organizations: Icahn School Of Medicine At Mount Sinai (Elmhurst, NY) and Icahn School Of Medicine At Mount Sinai (New York, NY). 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 Joseph Yoon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Joseph Yoon affiliated with any hospitals?
According to CMS data, Joseph Yoon is affiliated with Mount Sinai South Nassau.
When was this NPI record last updated?
The NPPES record for Joseph Yoon was last updated on March 27, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 months 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.
# Joseph Younghun Yoon, MD, MSC, MAED · NPI 1861982985
Neurocritical Care physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since May 14, 2018.
## Identity
- **NPI:** 1861982985 (Entity type: Individual)
- **Enumerated:** May 14, 2018
- **Primary specialty:** Psychiatry & Neurology - Neurocritical Care · taxonomy 2084A2900X
- **State license:** 315449 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, Boston, MA 02114-2696
- **Phone:** (617) 643-0596
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Icahn School Of Medicine At Mount Sinai (NPI 1063766038, Elmhurst, NY); Icahn School Of Medicine At Mount Sinai (NPI 1215488127, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** R Franklin University Of Med & Sci/chicago Medical School, class of 2018
## Record status
- **NPPES last updated:** March 27, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1861982985) · Data from the CMS NPPES public registry.