External quality assurance in medical rehabilitation is characterized by the programs of Germany's two largest providers of rehabilitation (the German pension insurance and the statutory health insurance). The programs were developed with considerable input from scientific institutes. Their strengths lie in measuring several relevant dimensions of quality, the comprehensive implementation for nearly all illnesses treated, integration of the patient perspective, and realization of prospective study designs with follow-up. Weaknesses include low relevance for patient allocation and compensation, the absence of systematic evaluations, and a lack of published patient information on the results of the quality measurements. Internal quality management in medical rehabilitation is regulated by sweeping legal guidelines. Since 2009, a statutory agreement has been in effect which includes a provision that all inpatient rehabilitation centers must be certified by October 2012. Areas for potential improvements in internal quality management processes include an improved theoretical basis, higher specificity for rehabilitation, and a more transparent, methodically improved structure of certification procedures.