ARI KATERELOS M.D.
NPI 1861607418
Radiology - Radiation Oncology in Tamuning, GU

Q: What is Ari Katerelos's NPI number?

The NPI number for Ari Katerelos is 1861607418. It was assigned to this individual provider in the NPPES registry on May 14, 2007. The provider is also known as Dr. Aristidis Katerelos M.D..

Q: What is Ari Katerelos's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Q: When was this NPI record last updated?

The NPPES record for Ari Katerelos was last updated on March 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.

Active since May 14, 2007PECOS EnrolledAccepts Medicare Assignment

88.06/100

CMS Quality Rating

633 GOV CARLOS CAMACHO RD STE B-1, TAMUNING, GU 96913(671) 646-3363(671) 646-4873 Get Directions Write a Review

NPPES record last updated: March 4, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Mar 4, 2026, Jan 24, 2023, Nov 6, 2020 (3 updates tracked since 2020).

On this page

About Ari Katerelos M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

ARI KATERELOS M.D. (NPI 1861607418) is an individual radiation oncology provider in Tamuning, Guam, licensed in Guam (M-1914) and active in the NPI registry since May 2007. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Bernardino, and is a graduate of University Of California, Geffen School Of Medicine (2005).

NPPES Registry Identity

NPI1861607418

Entity TypeIndividualMale

Primary Taxonomy2085R0001X

Provider Legal NameARI KATERELOSCredential: M.D.

Location Address633 GOV CARLOS CAMACHO RD STE B-1Tamuning, GU 96913

Mailing Address633 Gov Carlos Camacho Rd, Suite B1Tamuning, GU 96913

Phone(671) 646-3363

Fax(671) 646-4873

Sole ProprietorNo

Medical School CMSUniversity Of California, Geffen School Of MedicineGraduated 2005

Enumeration DateMay 14, 2007

Last NPPES UpdateMarch 4, 20263 updates tracked since enumeration

NPPES CertifiedMarch 4, 2026

✔ NPI 1861607418 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0001X

Licenses✔ Licensed in GU · M-1914✔ Licensed in CA · A99003

Definition

A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.

Other Names 1

Other Name (5)Dr. Aristidis Katerelos M.d.

Secondary Practice Location 1

Location 1401 E Highland Ave Ste DSan Bernardino, CA 92404-3800 · Phone (909) 475-2700 · Fax (909) 475-2738

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

Ari Katerelos M.d. 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.

PECOS PAC ID2365636099

PECOS Enrollment IDI20101027000277, I20230201002560

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

Medicare enrollment records show Ari Katerelos reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Advanced Radiation Oncology Medical Group, Inc.

Radiation Oncology

2707 E VALLEY BLVD STE 109
West Covina, CA 91792

Reassigned Medicare billing, California enrollment
5 clinicians in this Medicare group

NPI 1720266075 (626) 956-8009

City Of Hope Medical Foundation

Hematology & Oncology

1500 DUARTE RD
Duarte, CA 91010

Reassigned Medicare billing, California enrollment
1,335 clinicians in this Medicare group

NPI 1871886366 (626) 256-4673

Guam Surgicenter, LLC

Oncology, Radiation

633 GOV CARLOS G CAMACHO RD, GUAM MEDICAL PLAZA SUITE 101
Tamuning, GU 96913

Reassigned Medicare billing, Hawaii enrollment
2 clinicians in this Medicare group

NPI 1083946933 (671) 646-3855

Island Cancer Center Corporation

Radiation Oncology

633 GOV CARLOS CAMACHO RD, SUITE#B-1
Tamuning, GU 96913

Reassigned Medicare billing, Guam enrollment

NPI 1891665352 (671) 646-3363

Proton Doctors Professional Corporation

Radiation Oncology

9730 SUMMERS RIDGE RD
San Diego, CA 92121

Reassigned Medicare billing, California enrollment
20 clinicians in this Medicare group

NPI 1093240285 (858) 549-7400

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 17

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Complex proton beam radiation treatment 77525

Complex proton beam radiation treatment is a highly precise form of radiation therapy. It uses protons, a type of subatomic particle, to destroy cancer cells. Unlike traditional radiation, it can target a specific area, reducing damage to healthy tissue.

720 services148 patients

Ct guidance for insertion of radiation therapy fields 77014

CT guidance for insertion of radiation therapy fields involves using a CT scan to accurately map the area of your body where radiation will be applied. This ensures the radiation targets only the necessary area, minimizing impact to healthy tissues.

645 services146 patients

Injection, gadolinium-based magnetic resonance contrast agent, not otherwise specified (nos), per ml A9579

This is an MRI procedure where a gadolinium-based contrast agent is injected into your body. The agent enhances the images, making it easier to detect abnormalities. It's safe and side effects are rare. It's administered per milliliter as needed.

445 services24 patients

Stereoscopic x-ray guidance for localization of target volume for the delivery of radiation therapy G6002

Stereoscopic x-ray guidance is a technique used in radiation therapy. It involves taking multiple X-ray images from different angles to create a 3D picture of the area to be treated. This helps accurately pinpoint the exact location for radiation delivery, ensuring the therapy is as effective as possible.

407 services98 patients

Intermediate proton beam radiation treatment 77523

Intermediate proton beam radiation treatment is a precise type of radiation therapy. It uses protons instead of X-rays to treat certain types of cancer and other diseases. The protons can be directed to target the disease area with minimal damage to surrounding healthy tissue.

328 services59 patients

Ct guidance for insertion of radiation therapy fields 77014

260 services17 patients

Continuing radiation therapy consultation per week 77336

Continuing radiation therapy consultation per week involves regular meetings with your healthcare team. These sessions help monitor your progress, manage side effects, and adjust your treatment plan if necessary. It's a key part of ensuring the effectiveness of your radiation therapy.

161 services101 patients

Radiation treatment management, 5 treatment sessions 77427

Radiation treatment management involves a series of 5 sessions where targeted radiation is used to destroy or shrink cancer cells in your body. Each session is carefully planned to maximize effectiveness while minimizing harm to healthy tissues. You may experience side effects which will be closely monitored and managed for your comfort.

66 services18 patients

Design and construction of complex radiation treatment device 77334

The design and construction of a complex radiation treatment device is a process where a specialized instrument is created. This device targets harmful cells with high-energy rays to destroy or damage them, while minimizing impact on healthy cells. This aids in treating conditions like cancer.

54 services40 patients

Calculation of radiation therapy dose 77300

Radiation therapy dose calculation is a process to determine the exact amount of radiation needed to treat a specific area in the body. This calculation helps ensure the treatment is effective while minimizing harm to healthy tissues. It's a key part of planning your radiation therapy.

41 services13 patients

Radiation treatment management, 5 treatment sessions 77427

23 services18 patients

Mri scan of pelvis before and after contrast 72197

An MRI scan of the pelvis before and after contrast is a non-invasive imaging technique. It uses magnetic fields and radio waves to capture detailed images of your lower abdomen. Contrast dye, safe for the body, improves image clarity. This helps detect abnormalities more accurately.

21 services21 patients

Design and construction of complex radiation treatment device 77334

18 services16 patients

Complex radiation therapy planning 77263

Complex radiation therapy planning is a process to determine the most effective way to deliver radiation to a specific area in your body. It involves detailed imaging to map your body's structure, allowing for precise targeting of cancer cells while sparing healthy tissue.

15 services15 patients

Design and construction of radiation treatment device for high precision radiation therapy 77338

A radiation treatment device is custom-made for each patient to target cancer cells with high precision. It's designed to focus radiation on the tumor, sparing healthy tissue. This process ensures effective therapy while minimizing side effects.

15 services13 patients

Nuclear medicine study from skull base to mid-thigh with ct scan 78815

A nuclear medicine study from skull base to mid-thigh with a CT scan involves using a small amount of radioactive material and CT imaging to examine body tissues and organs. This helps detect any abnormalities by providing detailed images of the body's internal structure.

13 services13 patients

High precision radiation therapy planning 77301

High precision radiation therapy planning involves detailed mapping of your body to target cancer cells accurately. Advanced imaging techniques help identify the exact location of the tumor, minimizing harm to healthy tissues. This personalized approach enhances effectiveness and reduces side effects.

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 96913 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$180.05 typical visit price

range $60.53 – $180.05

Typical copayment $45.01 (range $15.13 – $45.01)

Most-billed visit code 99205

Established Patient

$74.92 typical visit price

range $20.09 – $147.56

Typical copayment $18.73 (range $5.02 – $36.89)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

88.06/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

87.23

Improvement Activities

Cost

74.73

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 Ari Katerelos's NPI number?

The NPI number for Ari Katerelos is 1861607418. It was assigned to this individual provider in the NPPES registry on May 14, 2007. The provider is also known as Dr. Aristidis Katerelos M.D..

Where is Ari Katerelos located?

Ari Katerelos practices at 633 Gov Carlos Camacho Rd Ste B-1, Tamuning, GU 96913. The listed phone number is (671) 646-3363.

What is Ari Katerelos's specialty?

The primary specialty registered for this NPI is Radiology, specializing in Radiation Oncology, with taxonomy code 2085R0001X.

Is Ari Katerelos enrolled in Medicare?

Yes. Ari Katerelos 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 Ari Katerelos's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ari Katerelos reassigns Medicare benefits to 5 organizations: Advanced Radiation Oncology Medical Group, Inc. (West Covina, CA), City Of Hope Medical Foundation (Duarte, CA), Guam Surgicenter, LLC (Tamuning, GU), Island Cancer Center Corporation (Tamuning, GU) and Proton Doctors Professional Corporation (San Diego, CA). 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 Ari Katerelos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ari Katerelos was last updated on March 4, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.