Mayo Clinic works with hundreds of insurance companies and is an in-network provider for millions of people. In most cases, Mayo Clinic doesn't require a physician referral. All appointments are prioritized on the basis of medical need. Arizona Specialists in oncology/hematology at Mayo Clinic oversee the care of people with lymphoma. Other specialists may be involved in your care, as needed. Arizona 800-446-2279 (toll-free) 8 a.m. to 5 p.m. Mountain Standard Time, Monday through Friday U.S. Patients Request Appointment International Patients Request Appointment Florida Specialists in oncology/hematology at Mayo Clinic oversee the care of people with lymphoma. Other specialists may be involved in your care, as needed.