Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ari Katerelos, M.D.

Radiation Oncology Physician in Tamuning, GU · enumerated 2007.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1861607418

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Registry record

Entity type Individual (Type 1)

Name Ari Katerelos

Credential M.D.

Sex Male

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

Phone (671) 646-3363

Fax (671) 646-4873

Enumeration date May 14, 2007

Last updated in NPPES Mar 4, 2026

Taxonomy & licenses

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License M-1914 (GU) Primary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License A99003 (CA) Secondary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Ari Katerelos's NPI record?

Cross-check NPI 1861607418 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1861607418 active?

Yes, as of the latest NPPES snapshot, NPI 1861607418 is active (record last updated 2026-03-04).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-03-04.