Subsection

One division of the Current Procedural Terminology (CPT) code book. The book is divided into seven code sections and appendices. Within each of the main sections are subsections and categories divided according to anatomical body system, organ, or site; procedure or service; condition; and specialty.

Subsidiary codes

CPT code numbers for services that are not part of the primary procedure and are not performed alone. These may be listed as each additional or list-in-addition-to services. Key phrases used throughout the CPT code book to identify subsidiary codes are each additional, list in addition to , and done at time of other major procedure(s) .

Substance abuse

Overindulgence in and dependence on alcohol or drugs (stimulants, depressants, or other chemical substances) that lead to effects that are detrimental to the individual’s physical or mental health or the safety or welfare of others. Also called chemical dependency .