California Hematology Oncology Medical Group
NPI 1831251230 · Hematology & Oncology Physician · El Segundo, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
California Hematology Oncology Medical Group is a Hematology & Oncology Physician organization in El Segundo, CA (NPI 1831251230).
Provider details
- NPI number
- 1831251230
- Entity type
- Organization
- Primary specialty
- Hematology & Oncology PhysicianAllopathic & Osteopathic Physicians
- Organization subpart
- No
- Authorized official
- Viveca Tokatlian, Billing Manager(310) 649-7222
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
19 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
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 methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-12-14
- Last updated
- 2015-05-20
Frequently asked questions
- What is California Hematology Oncology Medical Group's NPI number?
- California Hematology Oncology Medical Group's National Provider Identifier (NPI) is 1831251230, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is California Hematology Oncology Medical Group?
- California Hematology Oncology Medical Group is classified in the NPPES registry as Hematology & Oncology Physician (Allopathic & Osteopathic Physicians).
- Where is California Hematology Oncology Medical Group located?
- California Hematology Oncology Medical Group's practice location on file with NPPES is 390 N Sepulveda Blvd, El Segundo, CA 90245-4475.
- What is California Hematology Oncology Medical Group's phone number?
- The practice phone number listed in the NPPES registry for California Hematology Oncology Medical Group is (310) 649-7222.
- Does California Hematology Oncology Medical Group accept Medicare?
- California Hematology Oncology Medical Group is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for California Hematology Oncology Medical Group?
- The authorized official listed on California Hematology Oncology Medical Group's NPPES record is Viveca Tokatlian, Billing Manager. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is California Hematology Oncology Medical Group's NPI active?
- Yes — California Hematology Oncology Medical Group's NPI (1831251230) is active in the NPPES registry as of the last update on 2015-05-20.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.