G56.42 ICD-10-CM Code: Causalgia of left upper limb

G56.42 is the ICD-10-CM diagnosis code for causalgia of left upper limb. A condition causing burning pain in the left arm and hand, typically resulting from nerve injury or damage. This is a type of chronic pain syndrome affecting the upper limb. G56.42 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering nerve, nerve root and plexus disorders (g50-g59).

G56.42 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Causalgia is a specific type of complex regional pain syndrome (CRPS); ensure the diagnosis clearly documents this condition rather than general neuropathy.