### Question
What is the definition of certificate of medical necessity?


### Answer
The definition of **certificate of medical necessity** is as follows in *42 U.S.C. § 1395m*:

> a form or other document containing information required by the carrier to be submitted to show that an item is reasonable and necessary for the diagnosis or treatment of illness or injury or to improve the functioning of a malformed body member

#### Citation:
  - *42 U.S.C. § 1395m*
  - Heading: **CHAPTER 7-SOCIAL SECURITY > SUBCHAPTER XVIII-HEALTH INSURANCE FOR AGED AND DISABLED > Part B-Supplementary Medical Insurance Benefits for Aged and Disabled**

