### Question
How is the "ancillary services" defined?


### Answer
The term **ancillary services** is defined in *42 U.S.C. § 1395f* as follows -

> those special services for which charges are customarily made in addition to routine services.

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

