The Oncology Institute
Oncology • Glendale, WI • Since 2007 • over 100 clinics and affiliate locations locations
About
Summary: The Oncology Institute (TOI) is a public oncology and hematology care provider founded in 2007, headquartered in Cerritos, California. It delivers comprehensive, value-based cancer care in community settings across multiple states, with a focus on compassionate, high-quality treatment, clinical trials, transfusions, and related services. TOI operates about 100 clinics/affiliate locations, employs over 180 clinicians, and serves roughly 1.9 million patients. Key details: - Industry: Medical Practices; Oncology/Medical Oncology - Public company (Stock: TOI); IPO 2021 - Headquarters: Cerritos, CA - Locations: ~5 offices in the United States - Services: Comprehensive cancer care, chemotherapy, clinical trials, home-care options - Notable stats: ~234 employees in this summary, $502.7M annual revenue (as reported) - Website: theoncologyinstitute.com For the most accurate Glendale details, consider visiting TOI’s site or contacting their offices directly.
Clinic Type
Oncology
Address
18000 Studebaker Rd, Cerritos, California 90703, US
Phone
18003705722
medicalrecordsrequest@theoncologyinstitute.com
Opening Hours
Not published — contact the clinic to confirm hours.
Services Offered
Technology & Equipment
Team
Insurance & Payment
—
Languages Spoken
FAQs
What is The Oncology Institute?
A community-based oncology care provider offering a full spectrum of oncology services and precision cancer treatments.
Social Media
Photos








What Patients Say
Overall sentiment across review platforms: mixed
- Yelp (via MapQuest): 2.5 out of 5 stars (Approximately 18-23 reviews on Yelp)
Patients praise
- Some patients report highly positive experiences with specific doctors and medical staff
- Appreciation for professional, caring, and attentive bedside manner from providers
- Some patients describe the staff as courteous and the office environment as clean
Common complaints
- Difficulties with scheduling appointments and long hold times
- Communication challenges with office staff
- Concerns regarding the clarity of treatment information and coordination of care
- Isolated reports of dissatisfaction with medical care quality
"The staff and doctors are the most caring group of people I had ever met."
— A-Better-Place.com user review"This place is RIDICULOUS! I've been on hold in the past 45 minutes... I just cannot understand how this is even possible."
— Yelp/Yahoo Local user reviewSynthesized from public review platforms as of Jul 11, 2026 — sources: [1][2][3][4].
In the News
- The Oncology Institute Achieves $1.8 Million in Medicare — Apr 13, 2026
- The Oncology Institute Reports First Quarter 2026 Financial Results — May 7, 2026
- The Oncology Institute Reports Third Quarter 2025 Financial — Nov 13, 2025
- The Oncology Institute Appoints Kim Tzoumakas to Board of — Feb 23, 2026
- The Oncology Institute Announces Leadership Promotions — Jan 9, 2026
Information sourced from the clinic's website as of July 11, 2026.
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