NORTHERN CALIFORNIA RADIATION THERAPISTS & ONCOLOGISTS MEDICAL GROUP I
NPI 1720069891
Radiology - Radiation Oncology in San Francisco, CA

Q: What is Northern California Radiation Therapists & Oncologists Medical Group I's specialty?

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

Active since November 07, 2005

2333 BUCHANAN ST, SAN FRANCISCO, CA 94115(209) 342-2300(209) 524-4240 Get Directions Write a Review

NPPES record last updated: September 13, 2024. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Northern California Radiation Therapists & Oncologists Medical Group I NPPES

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

NORTHERN CALIFORNIA RADIATION THERAPISTS & ONCOLOGISTS MEDICAL GROUP I (NPI 1720069891) is a healthcare organization registered as a radiation oncology in San Francisco, California and active in the NPI registry since November 2005. The organization lists John W Lee, Medical Director, as its authorized official.

NPPES Registry Identity

NPI1720069891

Entity TypeOrganization

Primary Taxonomy2085R0001X

Legal Business NameNORTHERN CALIFORNIA RADIATION THERAPISTS & ONCOLOGISTS MEDICAL GROUP I

Location Address2333 BUCHANAN STSan Francisco, CA 94115-1925

Mailing Address450 Glass Ln Ste CModesto, CA 95356-9287 · (209) 342-2300 · Fax (209) 524-4240

Phone(209) 342-2300

Fax(209) 524-4240

Organization SubpartNo

Authorized OfficialJohn W LeeMedical Director · (209) 342-2300

Enumeration DateNovember 7, 2005

Last NPPES UpdateSeptember 13, 2024

NPPES CertifiedSeptember 13, 2024

✔ NPI 1720069891 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0001X

License✔ Licensed in CA · 102829

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.

2333 BUCHANAN ST, San Francisco, CA 94115

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Other Identifiers 8

OtherZZZ27539ZCA · Blue Shield

MedicaidGR0054561CA

OtherZZZ86312ZCA · Blue Shield

OtherZZZ75605ZCA · Blue Shield

MedicaidZZZ75605ZCA

MedicaidZZZ86312ZCA

OtherZZZ77840ZCA · Blue Shield

MedicaidZZZ77840ZCA

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Northern California Radiation Therapists & Oncologists Medical Group I is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 9 clinicians reassign Medicare billing to Northern California Radiation Therapists & Oncologists Medical Group I, which bills Medicare for the services they deliver. Of these, 5 practice at this address. They are listed nearest first.

Clinicians, nearest first (9)

Roy Abendroth, MD

Radiation Oncology

NPI 1811988421

2333 BUCHANAN ST
San Francisco, CA 94115

(209) 342-2300

✔ PECOS✔ Accepts MedicareSame address

Barry Chauser, MD

Radiation Oncology

NPI 1902897515

2333 BUCHANAN ST
San Francisco, CA 94115

(209) 342-2300

✔ PECOS✔ Accepts MedicareSame address

John Lee, MD

Radiation Oncology

NPI 1316938657

2333 BUCHANAN ST
San Francisco, CA 94115

(209) 342-2300

✔ PECOS✔ Accepts MedicareSame address

Meiwen Wu, MD

Radiation Oncology

NPI 1255312880

2333 BUCHANAN ST
San Francisco, CA 94115

(209) 342-2300

✔ PECOS✔ Accepts MedicareSame address

Shervin Shirvani, MD

Radiation Oncology

NPI 1922288679

2324 SACRAMENTO ST STE 111
San Francisco, CA 94115

(415) 600-3634

✔ PECOSSame address

Loan Tran, MD

Radiation Oncology

NPI 1043292410

400 TAYLOR BLVD STE 105
Pleasant Hill, CA 94523

(925) 435-1105

✔ PECOS✔ Accepts Medicare23 mi

James Mitchell, MD

Radiation Oncology

NPI 1700057569

575 LENNON LN
Walnut Creek, CA 94598

(925) 433-8786

✔ PECOS✔ Accepts Medicare24 mi

Michael Zhang, M.D., PH.D.

Radiation Oncology

NPI 1861856718

100 HOSPITAL DR STE 100
Vallejo, CA 94589

(707) 551-3400

✔ PECOS✔ Accepts Medicare26 mi

Patricia Seid, MD

Diagnostic Radiology

NPI 1710994520

1000 TRANCAS STREET
Napa, CA 94558

(707) 252-4411

✔ PECOS✔ Accepts Medicare38 mi

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

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 Northern California Radiation Therapists & Oncologists Medical Group I's NPI number?

The NPI number for Northern California Radiation Therapists & Oncologists Medical Group I is 1720069891. It was assigned to this organization in the NPPES registry on November 7, 2005.

Where is Northern California Radiation Therapists & Oncologists Medical Group I located?

Northern California Radiation Therapists & Oncologists Medical Group I is located at 2333 Buchanan St, San Francisco, CA 94115. The listed phone number is (209) 342-2300.

What is Northern California Radiation Therapists & Oncologists Medical Group I's specialty?

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

Is Northern California Radiation Therapists & Oncologists Medical Group I enrolled in Medicare?

Yes. Northern California Radiation Therapists & Oncologists Medical Group I is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Northern California Radiation Therapists & Oncologists Medical Group I?

According to the CMS Revalidation Reassignment List (October 2026 release), 9 clinicians in 2 Medicare specialties reassign their Medicare billing to Northern California Radiation Therapists & Oncologists Medical Group I. A 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 the clinician's services. The largest specialties are Radiation Oncology (8) and Diagnostic Radiology (1). Of these, 5 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Northern California Radiation Therapists & Oncologists Medical Group I was last updated on September 13, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 years 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.