To write software programs.
Example: "I learned to code on an early home computer in the 1980s."
To add codes to a dataset.
To categorise by assigning identifiers from a schedule, for example cpt coding for medical insurance purposes.
To encode.
Example: "We should code the messages we send out on usenet."
To encode a protein.
To call a hospital emergency code.
Example: "Coding in the ct scanner"
Of a patient, to suffer a sudden medical emergency (a code blue) such as cardiac arrest.