The ICD-10-CM Table of Drugs and Chemicals contains a main entry for "Drug" that contains codes for:

The main entry for "Drug" in the ICD-10-CM Table of Drugs and Chemicals is specifically designed to include codes for medications and substances that are not classified elsewhere in the coding system. This means that when a specific drug or chemical does not have a dedicated code or is not specified in any other section, it falls under the general category of "drugs that are not elsewhere classified." This provides a valuable resource for coders who encounter cases involving medications that might not be listed in a more specific manner within the coding guidelines.

The other options refer to aspects of medication and coding that do not align with the main purpose of this entry. For instance, coding for side effects and adverse reactions would be captured separately in other specific sections of the ICD-10-CM. Discontinued prescriptions are also not the focus; they relate more to clinical history rather than current diagnosis coding. Finally, the American Hospital Formulary Services (AHFS) list numbers are used for categorizing medications but do not pertain directly to the way drugs are categorized within the ICD-10-CM structure. Thus, the focus on drugs that are not classified elsewhere supports the accurate and comprehensive coding of unique medication cases.