S96.91Strain of unspecified muscle and tendon at ankle and foot level

S96.91 is the ICD-10-CM diagnosis code for strain of unspecified muscle and tendon at ankle and foot level. It belongs to category S96 (injury of muscle and tendon at ankle and foot level), block S90-S99 (injuries to the ankle and foot) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S96.9, choose S96.91 (Strain of unspecified muscle and tendon at ankle and foot level) only when documentation doesn't support a more specific option: unspecified injury of unspecified muscle and tendon at ankle and foot level (S96.90), laceration of unspecified muscle and tendon at ankle and foot level (S96.92) and other specified injury of unspecified muscle and tendon at ankle and foot level (S96.99).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.