JOHN MAHON MD
NPI 1326509373
Radiology - Diagnostic Radiology in New York, NY
About John Mahon Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
JOHN MAHON MD (NPI 1326509373) is an individual diagnostic radiology provider in New York, New York, licensed in New York (332145-01) and active in the NPI registry since March 2019. He is enrolled in Medicare PECOS, is affiliated with North Shore University Hospital, and is a graduate of State University Of New York At Stony Brook, School Of Medicine (2019).
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
John Mahon Md 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 John Mahon reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
New Hyde Park, NY 11040
- Reassigned Medicare billing, New York enrollment
- 9,353 clinicians in this Medicare group
Seaford, NY 11783
- Reassigned Medicare billing, New York enrollment
- 391 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 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
North Shore University Hospital
Acute Care Hospitals · Manhasset, NYLenox Hill Hospital
Acute Care Hospitals · New York, NYNorthern Westchester Hospital
Acute Care Hospitals · Mount Kisco, NYLong Island Jewish Medical Center
Acute Care Hospitals · New Hyde Park, NYPhelps Hospital
Acute Care Hospitals · Sleepy Hollow, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 10075 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 10075
NEW YORK, NY 10075
NEW YORK, NY 10075
NEW YORK, NY 10075
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 John Mahon's NPI number?
The NPI number for John Mahon is 1326509373. It was assigned to this individual provider in the NPPES registry on March 30, 2019.
Where is John Mahon located?
John Mahon practices at 100 E 77th St, New York, NY 10075. The listed phone number is (212) 434-2000.
What is John Mahon's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is John Mahon enrolled in Medicare?
Yes. John Mahon 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 John Mahon's services?
According to the CMS Revalidation Reassignment List (October 2026 release), John Mahon reassigns Medicare benefits to 2 organizations: North Shore - Lij Medical PC (New Hyde Park, NY) and Southside Faculty Medical Affiliates University Faculty Practice Corp (Seaford, 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 John Mahon's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is John Mahon affiliated with any hospitals?
According to CMS data, John Mahon is affiliated with North Shore University Hospital, Lenox Hill Hospital, Northern Westchester Hospital, Long Island Jewish Medical Center and Phelps Hospital.
When was this NPI record last updated?
The NPPES record for John Mahon was last updated on May 19, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.
# John Mahon, MD · NPI 1326509373
Diagnostic Radiology physician in New York, New York. Individual provider, active in the CMS NPPES registry since March 30, 2019.
## Identity
- **NPI:** 1326509373 (Entity type: Individual)
- **Enumerated:** March 30, 2019
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** 332145-01 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 100 E 77TH ST, New York, NY 10075-1850
- **Phone:** (212) 434-2000
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): North Shore - Lij Medical PC (NPI 1790043479, New Hyde Park, NY); Southside Faculty Medical Affiliates University Faculty Practice Corp (NPI 1033791058, Seaford, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York At Stony Brook, School Of Medicine, class of 2019
## Record status
- **NPPES last updated:** May 19, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1326509373) · Data from the CMS NPPES public registry.