(This measure has not been amended since it was reported to the House on May 10, 2016. The summary of that version is repeated here.) Improving Treatment for Pregnant and Postpartum Women Act of 2016 (Sec. 2) This bill amends the Public Health Service Act to extend support for residential substance abuse treatment programs for pregnant and postpartum women through FY2021. (Sec. 3) The Center for Substance Abuse Treatment must carry out a pilot program to make grants to state substance abuse agencies to support services for pregnant and postpartum women who have a primary diagnosis of a substance use disorder, including opioid use disorders (opioids are drugs with effects similar to opium, such as heroin and certain pain medications). The Center for Behavioral Health Statistics and Quality must fund an evaluation of the pilot program. (Sec. 4) As an offset, the bill reduces the authorization of appropriations for Centers for Disease Control and Prevention facilities for FY2017.