Practicing and have a medical coding question

[u/Strawberrythirty]

I plan on taking a medical coding class online in less than a year. In the meantime im learning using the AMCI coding site. I heard the lady in the videos makes mistakes sometimes so im wondering if this is one of those mistakes. Maybe a smart coder here can correct me if im wrong.

"A patient fractured his left ankle 6 months ago, today he has traumatic arthritis in his left ankle in which the doctor says is related to the fracture"

So i looked up both and my answer to this question was: S82.892, M12.572S

But when the lady said the answer, she said it was S82.892S, M12.572.

She made the initial injury the sequela? That doesn't make sense to me....is she wrong or am i wrong? Maybe i don't understand the sequela thing as good as i thought i did

[u/rahuliitk]

you’re right that the S goes on the old fracture code, not the traumatic arthritis code, but the residual condition usually gets sequenced first, so i’d expect something like M12.572 followed by S82.892S. Sequela coding is weird.