ICD-10 Code G90.52 – Complex regional pain syndrome I of lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.52 – Complex regional pain syndrome I of lower limb
What it is
G90.52 identifies complex regional pain syndrome type I affecting a lower limb. It describes persistent regional pain after injury or other trigger, without confirmed nerve injury.
Clinical signs
Typical findings include disproportionate pain, swelling, temperature or color change, and abnormal sweating in the affected leg or foot. Clinical features vary; refer to documentation.
When to use this code
Use G90.52 when the record documents CRPS type I in the lower extremity, such as after fracture, sprain, or surgery. You should also see supporting notes about regional pain and autonomic or trophic changes. If the limb is unspecified, check documentation.
Do not use for
Do not use this code for CRPS type II or for pain with documented nerve injury. Do not code it for generalized chronic pain or symptoms alone without a documented diagnosis.
Coding tip
Verify that the provider names both CRPS type I and the lower limb site before assigning G90.52.