We are revising the Social Security and Supplemental Security Income (SSI) regulations concerning the evaluation of medical opinions to clarify how administrative law judges and the Appeals Council are to consider opinion evidence from State agency medical and psychological consultants, other program physicians and psychologists, and medical experts we consult in claims for disability benefits under titles II and XVI of the Social Security Act (the Act). We are also defining and clarifying several terms used in our regulations and deleting other terms.