Ari Katerelos, M.D.

Primary specialty

Radiation Oncology PhysicianTaxonomy code 2085R0001X

License

M-1914 Issued in GU

Practice address

633 Gov Carlos Camacho Rd Ste B-1
Tamuning, GU 96913

Phone

(671) 646-3363

Fax

(671) 646-4873

NPI assigned

May 14, 2007

Sex

Male

Sole proprietor

No

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

Specialties & licenses 2

Addresses

Other names 1

• Dr. Aristidis Katerelos Other name

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in CA, GU2 enrollments

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 2

Specialty

Radiation Oncology

Education

University of California, Geffen School of Medicine, 2005

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

Proton Doctors Professional CorporationGroup PAC ID 7214202936, 13 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

75.81 of 100Reported as group

Quality

51.62

Improvement activities

40

Merit-based Incentive Payment System (MIPS)

Final score

79.22 of 100Reported as group

Quality

78.84

Improvement activities

40

Cost

61.61

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles (10 of 11)

Locations

Networks

• BSC 65 PLUS INDIVIDUAL MAPD

Interoperability endpoints

• Direct secure messaging: akaterelos672663@oc.providencedirect.org
• Direct secure messaging: direct@cityofhope.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.

• Island Cancer Center Corporation

  • Radiation Oncology Physician
  • Tamuning, GU
  • NPI 1891665352

  GU, Radiation Oncology

  Medicare reassignment NPD Authorized official
• Proton Doctors Professional Corporation

  • Radiation Oncology Physician
  • San Diego, CA
  • NPI 1093240285

  CA, Radiation Oncology

  Medicare reassignment Care Compare group NPD
• Advanced Radiation Oncology Medical Group, Inc.

  • Radiation Oncology Physician
  • West Covina, CA
  • NPI 1720266075

  CA, Radiation Oncology

  Medicare reassignment NPD
• City of Hope Medical Foundation

  • Hematology & Oncology Physician
  • Duarte, CA
  • NPI 1871886366

  CA, Radiation Oncology

  Medicare reassignment NPD
• Guam Surgicenter, LLC

  • Radiation Oncology Clinic/Center
  • Tamuning, GU
  • NPI 1083946933

  HI

  Medicare reassignment
• Community Hospital of San Bernardino

  • Pediatric Skilled Nursing Facility
  • San Bernardino, CA
  • NPI 1851395685
  NPD (past)
• Dignity Health

  • General Acute Care Hospital
  • San Bernardino, CA
  • NPI 1689769911
  NPD (past)
• Henry Mayo Newhall Memorial Hospital

  • General Acute Care Hospital
  • Valencia, CA
  • NPI 1780668434
  NPD (past)
• Loma Linda University Medical Center

  • General Acute Care Hospital
  • Loma Linda, CA
  • NPI 1194731935
  NPD (past)
• Providence Health System - Southern California

  • General Acute Care Hospital
  • Mission Hills, CA
  • NPI 1477587632
  NPD (past)
• Valley Radiotherapy Associates Medical Group Inc

  • Radiation Oncology Physician
  • Fullerton, CA
  • NPI 1255594925

  Radiation Oncology

  NPD (past)

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

{
    "created_epoch": "1179100800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1772582400000",
    "number": "1861607418",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "633 GOV CARLOS CAMACHO RD",
            "address_2": "SUITE B1",
            "city": "TAMUNING",
            "state": "GU",
            "postal_code": "96913"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "633 GOV CARLOS CAMACHO RD STE B-1",
            "city": "TAMUNING",
            "state": "GU",
            "postal_code": "96913",
            "telephone_number": "671-646-3363",
            "fax_number": "671-646-4873"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "401 E Highland Ave Ste D",
            "address_purpose": "LOCATION",
            "city": "San Bernardino",
            "state": "CA",
            "postal_code": "924043800",
            "country_code": "US",
            "telephone_number": "909-475-2700",
            "fax_number": "909-475-2738",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "KATERELOS",
        "first_name": "ARI",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2007-05-14",
        "last_updated": "2026-03-04",
        "certification_date": "2026-03-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "GU",
            "license": "M-1914",
            "primary": true
        },
        {
            "code": "2085R0001X",
            "taxonomy_group": "",
            "desc": "Radiology, Radiation Oncology",
            "state": "CA",
            "license": "A99003",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "direct@cityofhope.direct-ci.com",
            "affiliation": "Y",
            "affiliationName": "CITY OF HOPE MEDICAL FOUNDATION",
            "address_1": "1500 Duarte Rd",
            "city": "Duarte",
            "state": "CA",
            "country_code": "US",
            "postal_code": "910103012",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "ARISTIDIS",
            "last_name": "KATERELOS",
            "prefix": "DR.",
            "credential": "M.D.",
            "code": "5",
            "type": "Other Name"
        }
    ]
}

• Kimberly Amanda Kaneshiro
• Roger John Kaneshiro, DDS, MS
• Margaret Kang, PHARM.D.
• Shinik Kang, L. AC
• Steven Kasala
• Karyn A. Kaufman, PA-C
• Ashish Khandelwal, MD
• KHKN Corporation
• Byungsoo Kim, M.D.
• John Junghyun Kim, OD

• All providers in Tamuning, GU
• Radiation Oncology Physician in Guam

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Mar 4, 2026; 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.