John Mahon, MD

Primary specialty

Diagnostic Radiology PhysicianTaxonomy code 2085R0202X

License

332145-01 Issued in NY

Practice address

100 E 77TH St
New York, NY 10075-1850

Phone

(212) 434-2000

NPI assigned

Mar 30, 2019

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in NY

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Diagnostic Radiology

Education

State University of New York at Stony Brook, School of Medicine, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Southside Faculty Medical Affiliates University Faculty Practice CorpGroup PAC ID 5698175933, 224 clinicians

North Shore-Lij Medical PCGroup PAC ID 3375701568, 6,374 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• North Shore University Hospital Hospital, Manhasset, NY, CCN 330106
• Lenox Hill Hospital Hospital, New York, NY, CCN 330119
• Phelps Hospital Hospital, Sleepy Hollow, NY, CCN 330261
• Northern Westchester Hospital Hospital, Mount Kisco, NY, CCN 330162
• Long Island Jewish Medical Center Hospital, New Hyde Park, NY, CCN 330195

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

• Healthfirst Medicare Network H5989
• Healthfirst Medicare Network H3359
• Healthfirst Medicare Network H9678
• Healthfirst Medicare Network H1722

Interoperability endpoints

• Direct secure messaging: jmahon51766@northwell.direct-ci.com

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.

• North Shore-Lij Medical PC

  dba NHPP Cardiology at Great Neck

  • Urology Physician
  • Great Neck, NY
  • NPI 1053688572
  Medicare reassignment Care Compare group NPD
• Southside Faculty Medical Affiliates University Faculty Practice Corp

  • Body Imaging Physician
  • Seaford, NY
  • NPI 1033791058
  Medicare reassignment Care Compare group NPD

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Lenox Hill Hospital

  • General Acute Care Hospital
  • New York, NY
  • NPI 1477616571
  Care Compare affiliation
• Long Island Jewish Medical Center

  • General Acute Care Hospital
  • New Hyde Park, NY
  • NPI 1285641514
  Care Compare affiliation
• North Shore University Hospital

  • General Acute Care Hospital
  • Manhasset, NY
  • NPI 1366459570
  Care Compare affiliation
• Northern Westchester Hospital Association

  dba Northern Westchester Hospital Transitional Care Unit

  • Medicare Defined Swing Bed Hospital Unit
  • Mount Kisco, NY
  • NPI 1396178356
  Care Compare affiliation
• Northern Westchester Hospital Association

  dba Northern Westchester Hospital

  • General Acute Care Hospital
  • Mount Kisco, NY
  • NPI 1912992215
  Care Compare affiliation
• Phelps Memorial Hospital Association

  dba Phelps Hospital

  • General Acute Care Hospital
  • Sleepy Hollow, NY
  • NPI 1720185267
  Care Compare affiliation

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1553904000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1747612800000",
    "number": "1326509373",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "32 CAROLINE AVE",
            "city": "SETAUKET",
            "state": "NY",
            "postal_code": "117333009",
            "telephone_number": "631-521-1792"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "100 E 77TH ST",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100751850",
            "telephone_number": "212-434-2000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "MAHON",
        "first_name": "JOHN",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2019-03-30",
        "last_updated": "2025-05-19",
        "certification_date": "2025-05-19",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0202X",
            "taxonomy_group": "",
            "desc": "Radiology, Diagnostic Radiology",
            "state": "NY",
            "license": "332145-01",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Brian Fisher Mahon, PH.D.
• Denise Mary Mahon, RN
• Elizabeth Anne Mahon, OTR/L
• Eugene J. Mahon, M.D.
• Frederick Mahon, P.T.
• Maeve Mahon, M.D.
• Yudith O. Mahon, RN
• Lisa Noel Mahoney-Toth, LCSW
• Brianna Mahoney
• Bryan Patrick Mahoney, M.D.

• Diagnostic Radiology Physician in New York, NY
• Providers in New York, NY by specialty
• Diagnostic Radiology Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on May 19, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.