Medicare Respiratory Therapist Access Act of 2013 - Amends title XVIII (Medicare) of the Social Security Act to provide Medicare coverage of pulmonary self-management education and training services furnished by a qualified respiratory therapist in a physician practice to patients with chronic lung disease (chronic obstructive pulmonary disease [COPD], including emphysema and bronchitis, as well as asthma, pulmonary hypertension, pulmonary fibrosis, and cystic fibrosis).