Contact Boston Comprehensive Treatment Center now and get same-day admission. We accept most major insurances. Overcome opioid addiction with our experienced methadone treatment providers. Our care is safe, affordable, and tailored to your needs. Located in Boston, Massachusetts, Boston Comprehensive Treatment Center (CTC) and methadone clinic provides medication-assisted treatment (MAT) for adults age 18 and older who are battling opioid use disorder, which is also known as opioid addiction.