ICD-10 Code G90.529 – Complex regional pain syndrome I of unspecified lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.529 – Complex regional pain syndrome I of unspecified lower limb
What it is
G90.529 identifies complex regional pain syndrome type I affecting an unspecified lower limb. Use it for persistent regional pain in a leg or foot after injury or other trigger, without confirmed nerve injury.
Clinical signs
Typical findings include pain out of proportion to the initial event, swelling, color or temperature change, and abnormal sensitivity. Clinical features vary; refer to documentation.
When to use this code
Use this code when the record documents CRPS type I in a lower limb but does not specify left or right. It also fits cases where the clinician notes reflex sympathetic dystrophy or similar terminology and the lower limb is the affected site. Check documentation if nerve injury is described, because that may indicate a different code.
Do not use for
Do not use this code for CRPS type II, which involves confirmed nerve injury. Do not use it when the affected side is documented and a laterality-specific code is available.
Coding tip
Verify both the CRPS type and the limb laterality before assigning G90.529.