Ari Katerelos, M.D.
NPI 1861607418 · Radiation Oncology Physician · Tamuning, GU
Enrolled with Medicare as Practitioner - Radiation Oncology · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Ari Katerelos, M.D. is a Radiation Oncology Physician provider in Tamuning, GU (NPI 1861607418).
Provider details
- NPI number
- 1861607418
- Entity type
- Individual
- Primary specialty
- Radiation Oncology PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- M-1914 (GU)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure25% of score
19 yrs in NPPES registry
- Profile completeness25% of score
100% of core fields populated
- Practice footprint15% of score
2 documented practice locations
- Medicare service volume (vs. specialty peers)25% of score
2,798 Medicare services, 2024 (ranked within specialty)
- Open Payments transparency10% of score
Has Open Payments disclosures (2024)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our .
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Complex Proton Beam Radiation Treatment77525 | 720 | $1,295 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 645 | $133 |
| Stereoscopic X-Ray Guidance for Localization of Target Volume for the Delivery of Radiation TherapyG6002 | 407 | $85 |
| Intermediate Proton Beam Radiation Treatment77523 | 328 | $1,147 |
| Ct Guidance for Insertion of Radiation Therapy Fields77014 | 260 | $47 |
| Continuing Radiation Therapy Consultation Per Week77336 | 161 | $101 |
Transparency — industry payments
Based on CMS Open Payments, 2024; not all care is captured.
$525 across 1 record (Open Payments 2024)
Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.
Practice location
Mailing address
Additional practice locations (1)
- 401 E Highland Ave Ste DSan Bernardino, CA 92404-3800Phone: (909) 475-2700Fax: (909) 475-2738
Registry dates
- Enumerated
- 2007-05-14
- Last updated
- 2026-03-04
- Certified
- 2026-03-04
Frequently asked questions
- What is Ari Katerelos's NPI number?
- Ari Katerelos's National Provider Identifier (NPI) is 1861607418, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Ari Katerelos's specialty?
- Ari Katerelos is listed in the NPPES registry with a primary specialty of Radiation Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is Ari Katerelos located?
- Ari Katerelos's practice location on file with NPPES is 633 Gov Carlos Camacho Rd Ste B-1, Tamuning, GU 96913.
- What is Ari Katerelos's phone number?
- The practice phone number listed in the NPPES registry for Ari Katerelos is (671) 646-3363.
- Does Ari Katerelos accept Medicare?
- Ari Katerelos is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Ari Katerelos's NPI active?
- Yes — Ari Katerelos's NPI (1861607418) is active in the NPPES registry as of the last update on 2026-03-04.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.