JANE YONJOO AHN
NPI 1861020794
Anesthesiology in Stony Brook, NY
About Jane Yonjoo Ahn NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JANE YONJOO AHN (NPI 1861020794) is an individual anesthesiology provider in Stony Brook, New York, licensed in New York (329014) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS, is affiliated with Medstar Union Memorial Hospital, and is a graduate of Oakland Univ, William Beaumont School Of Medicine (2020).
NPPES Registry Identity
Specialties & Licenses
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
Jane Yonjoo Ahn 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 Jane Ahn reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Chappaqua, NY 10514
- Reassigned Medicare billing, New York enrollment
- 1,406 clinicians in this Medicare group
Baltimore, MD 21239
- Reassigned Medicare billing, Maryland enrollment
- 2,602 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
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 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Medstar Union Memorial Hospital
Acute Care Hospitals · Baltimore, MDMedstar Good Samaritan Hospital
Acute Care Hospitals · Baltimore, MDOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
STONY BROOK, NY 11794
STONY BROOK, NY 11794
STONY BROOK, NY 11794
STONY BROOK, NY 11794
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 Jane Ahn's NPI number?
The NPI number for Jane Ahn is 1861020794. It was assigned to this individual provider in the NPPES registry on March 27, 2020.
Where is Jane Ahn located?
Jane Ahn practices at 101 Nicolls Rd, Stony Brook, NY 11794. The listed phone number is (631) 444-2975.
What is Jane Ahn's specialty?
The primary specialty registered for this NPI is Anesthesiology with taxonomy code 207L00000X.
Is Jane Ahn enrolled in Medicare?
Yes. Jane Ahn 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 Jane Ahn's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Jane Ahn reassigns Medicare benefits to 2 organizations: North Shore - Lij Anesthesiology, PC (Chappaqua, NY) and Medstar Medical Group II LLC (Baltimore, MD). 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 Jane Ahn's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Jane Ahn affiliated with any hospitals?
According to CMS data, Jane Ahn is affiliated with Medstar Union Memorial Hospital and Medstar Good Samaritan Hospital.
When was this NPI record last updated?
The NPPES record for Jane Ahn was last updated on April 21, 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.
# Jane Yonjoo Ahn · NPI 1861020794
Anesthesiology physician in Stony Brook, New York. Individual provider, active in the CMS NPPES registry since March 27, 2020.
## Identity
- **NPI:** 1861020794 (Entity type: Individual)
- **Enumerated:** March 27, 2020
- **Primary specialty:** Anesthesiology · taxonomy 207L00000X
- **State license:** 329014 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 NICOLLS RD, Stony Brook, NY 11794-0001
- **Phone:** (631) 444-2975
## 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): North Shore - Lij Anesthesiology, PC (NPI 1417401266, Chappaqua, NY); Medstar Medical Group II LLC (NPI 1184046187, Baltimore, MD) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Oakland Univ, William Beaumont School Of Medicine, class of 2020
## Record status
- **NPPES last updated:** April 21, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1861020794) · Data from the CMS NPPES public registry.