About Bellingham Comprehensive Treatment Center in Bellingham, WA Bellingham Comprehensive Treatment Center (CTC), which is located in Bellingham, Washington, offers medication-assisted treatment (MAT) on an outpatient basis for adults who have developed opioid use disorder. The comprehensive treatment center serves adults age 18 and older of all genders who have been struggling with addictions to heroin, prescription painkillers, and other opioids. MAT is an evidence-based, research-supported approach to opioid addiction treatment that incorporates prescription medications and counseling.