Physical Therapy ICD-10-CM codes

Therapy claims typically carry two kinds of codes: the medical diagnosis that caused the referral and the treatment diagnosis describing the impairment being treated. Low back pain (M54.50), cervicalgia (M54.2), and site-specific joint pain from M25.5 (M25.561 right knee, M25.511 right shoulder) are the most common medical diagnoses, while muscle weakness (M62.81), unsteadiness on feet (R26.81), abnormal gait (R26.9), repeated falls (R29.6), and ataxia (R27.0) describe the functional deficits that justify skilled therapy.

Laterality applies to every paired-site code: use M25.561 or M25.562 for knee pain and M75.101 or M75.102 for rotator cuff tears, not the unspecified-side versions, which Medicare contractors flag. For post-surgical rehab after joint replacement, the primary code is Z47.1 (aftercare following joint replacement) with the prosthesis status code (Z96.651 right knee, Z96.641 right hip); coding the original osteoarthritis after the joint has been replaced is incorrect.

For post-stroke therapy, code the specific I69 sequela such as I69.351 (hemiplegia following cerebral infarction affecting the right dominant side) rather than a current stroke code. When treating an acute injury like an ankle sprain, keep the 7th character accurate across the plan of care: S93.401A applies while the patient is under active treatment for the injury, and D applies to subsequent healing-phase visits in many payer interpretations, so follow the referring provider's coding and payer guidance.