Final answer:
Patient encounters for subsequent treatment of an injury are identified with a seventh character of 'A'.
Step-by-step explanation:
Patient encounters for subsequent treatment of an injury are identified with a seventh character of A. The seventh character is used to indicate the episode of care for the injury, such as an initial encounter, subsequent encounter, or sequela. For example, if a patient comes in for follow-up treatment after an initial visit, the seventh character 'A' would be used.