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CALIFORNIA HEMATOLOGY ONCOLOGY MEDICAL GROUP
NPI 1831251230
Internal Medicine - Hematology & Oncology in El Segundo, CA

Active since December 14, 2006
390 N SEPULVEDA BLVD, 1020, EL SEGUNDO, CA 90245(310) 649-7222 Get Directions Write a Review

NPPES record last updated: May 20, 2015. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About California Hematology Oncology Medical Group NPPES

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

CALIFORNIA HEMATOLOGY ONCOLOGY MEDICAL GROUP (NPI 1831251230) is a healthcare organization registered as a hematology & oncology in El Segundo, California and active in the NPI registry since December 2006. The organization lists Viveca Tokatlian, Billing Manager, as its authorized official.

NPPES Registry Identity

NPI1831251230
Entity TypeOrganization
Primary Taxonomy207RH0003X
Legal Business NameCALIFORNIA HEMATOLOGY ONCOLOGY MEDICAL GROUP
Location Address390 N SEPULVEDA BLVD, 1020El Segundo, CA 90245-4475
Mailing Address390 N Sepulveda Blvd, 1020El Segundo, CA 90245-4475 · (310) 649-7222
Phone(310) 649-7222
Organization SubpartNo
Authorized OfficialViveca TokatlianBilling Manager · (310) 649-7222
Enumeration DateDecember 14, 2006
Last NPPES UpdateMay 20, 2015
✔ NPI 1831251230 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
390 N SEPULVEDA BLVD, El Segundo, CA 90245
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Other Identifiers 1

Medicare PINW12009CA

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)

California Hematology Oncology Medical Group is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

2

Medicare enrollment records show 2 clinicians reassign Medicare billing to California Hematology Oncology Medical Group, which bills Medicare for the services they deliver. Of these, 1 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (2)

Frank Mori, M.D.
Hematology/Oncology
NPI 1396760328
6801 PARK TERRACE 130
La, CA 90045
(310) 649-7222
✔ PECOS✔ Accepts Medicare3.9 mi
Mark Ngo, M.D.
Hematology/Oncology
NPI 1982623468
1043 ELM AVE STE 104
Long Beach, CA 90813
(562) 590-0345
✔ PECOS✔ Accepts Medicare15 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 California Hematology Oncology Medical Group's NPI number?

The NPI number for California Hematology Oncology Medical Group is 1831251230. It was assigned to this organization in the NPPES registry on December 14, 2006.

Where is California Hematology Oncology Medical Group located?

California Hematology Oncology Medical Group is located at 390 N Sepulveda Blvd 1020, El Segundo, CA 90245. The listed phone number is (310) 649-7222.

What is California Hematology Oncology Medical Group's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is California Hematology Oncology Medical Group enrolled in Medicare?

Yes. California Hematology Oncology Medical Group is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through California Hematology Oncology Medical Group?

According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Hematology/Oncology, reassign their Medicare billing to California Hematology 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, 1 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for California Hematology Oncology Medical Group was last updated on May 20, 2015. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.