(What is the ICD-10-CM code for amedial meniscus tearof theleft kneedue to arecent football injury?

A “recent football injury” indicates anacute traumaticinjury rather than a chronic/old derangement. Acute meniscus tears are coded from theS83.2-category (tear of meniscus, current injury), not theM23.-category (derangement of meniscus due to old tear or injury). The question specifiesmedial meniscus,left knee, and implies aninitial encounterfor the acute injury, so the correct code must include laterality and the 7th characterAfor initial encounter.S83.232Acorresponds to acurrent tear of the medial meniscus, left knee, initial encounter.S83.242Ais a different meniscus specification (not medial).M23.202/M23.204are derangement codes typically used forold tearsor chronic conditions, not an acute recent sports injury. CPC exam tip: “recent injury” →S-codes, “old tear/derangement” →M23. Mnemonic:S = Sudden (acute),M = Mature (old/chronic).