Contact Northwest Oncology & Hematology. Call any of our five locations: 847.870.4100 (Rolling Meadows office), 847.437.3312 (Elk Grove Village office), 847.885.4100 (Hoffman Estates office), 847.842.0180 (Barrington office) and 847.577.1023 (Elgin Office). For your convenience, you can also use our New Patient Appointment online form to schedule your consultation with us..