md dx and treating dx

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On outpatient phyical therapy claims, how are you coding the claims? With ICD-9 basically the therapist documented a treating dx, like abnormality of gait, and that crossed over to the claim. With ICD-10 they are following that same rule of thumb. I know that we are in the 1 year grace period with ICD-10 codes with Medicare but everything I read states that the claim needs to create a complete medical picture of the patients Medical status. So I believe the Medical dx and treating dx would need to be on the claim to get that complete picture. That goes for aftercare codes, etc...
Pain in right hand, stiffness in right knee, not accurate, correct?
Your thoughts?