ORANGE COUNTY RADIATION ONCOLOGY MEDICAL GROUP
NPI 1992712699
Radiology - Radiation Oncology in Santa Ana, CA

Q: What is Orange County Radiation Oncology Medical Group's specialty?

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

Active since August 02, 2006

1100 N TUSTIN AVE STE A, SANTA ANA, CA 92705(714) 835-8520(714) 835-3610 Get Directions Write a Review

NPPES record last updated: April 6, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 6, 2021, Aug 22, 2020 (2 updates tracked since 2020).

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About Orange County Radiation Oncology Medical Group NPPES

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

ORANGE COUNTY RADIATION ONCOLOGY MEDICAL GROUP (NPI 1992712699) is a healthcare organization registered as a radiation oncology in Santa Ana, California and active in the NPI registry since August 2006. The organization lists Chu-pei Feng, Owner, as its authorized official.

NPPES Registry Identity

NPI1992712699

Entity TypeOrganization

Primary Taxonomy2085R0001X

Legal Business NameORANGE COUNTY RADIATION ONCOLOGY MEDICAL GROUP

Location Address1100 N TUSTIN AVE STE ASanta Ana, CA 92705-3509

Mailing Address1100 N Tustin Ave Ste ASanta Ana, CA 92705-3509 · (714) 835-8520 · Fax (148) 353-6107

Phone(714) 835-8520

Fax(714) 835-3610

Organization SubpartNo

Authorized OfficialChu-pei FengOwner · (714) 835-8520

Enumeration DateAugust 2, 2006

Last NPPES UpdateApril 6, 20212 updates tracked since enumeration

NPPES CertifiedApril 6, 2021

✔ NPI 1992712699 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyRadiology · Radiation OncologyAllopathic & Osteopathic Physicians

Taxonomy Code2085R0001X

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.

Also ListedSpecialistTaxonomy 174400000X

1100 N TUSTIN AVE STE A, Santa Ana, CA 92705

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Other Identifiers 2

MedicaidGR0098520CA

MedicaidGR0098521CA

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)

Orange County Radiation Oncology Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 2 clinicians reassign Medicare billing to Orange County Radiation Oncology Medical Group, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.

Clinicians, nearest first (2)

Chu Pei Feng, M.D.

Radiation Oncology

NPI 1922010073

1100-A N. TUSTIN AVE
Santa Ana, CA 92705

(714) 835-8520

✔ PECOSSame address

Sharon Lee, M.D.

Radiation Oncology

NPI 1215105432

1100 N TUSTIN AVE STE A
Santa Ana, CA 92705

(714) 835-8520

✔ PECOSSame address

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 Orange County Radiation Oncology Medical Group's NPI number?

The NPI number for Orange County Radiation Oncology Medical Group is 1992712699. It was assigned to this organization in the NPPES registry on August 2, 2006.

Where is Orange County Radiation Oncology Medical Group located?

Orange County Radiation Oncology Medical Group is located at 1100 N Tustin Ave Ste A, Santa Ana, CA 92705. The listed phone number is (714) 835-8520.

What is Orange County Radiation Oncology Medical Group's specialty?

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

Is Orange County Radiation Oncology Medical Group enrolled in Medicare?

Yes. Orange County Radiation Oncology Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Orange County Radiation Oncology Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Radiation Oncology, reassign their Medicare billing to Orange County Radiation Oncology Medical Group. 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. Of these, 2 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 Orange County Radiation Oncology Medical Group was last updated on April 6, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 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.