ICD-10 Code G90.522 – Complex regional pain syndrome I of left lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.522 – Complex regional pain syndrome I of left lower limb
What it is
G90.522 identifies complex regional pain syndrome type I affecting the left lower limb. Use it when the record describes ongoing regional pain after injury or illness without confirmed nerve injury.
Clinical signs
Typical findings include disproportionate pain, swelling, temperature or color changes, and altered sensitivity in the affected limb. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents CRPS type I in the left leg, foot, ankle, or other left lower-extremity location. It also fits when the note clearly links the syndrome to that limb and does not describe nerve damage. If laterality or type is unclear, check documentation.
Do not use for
Do not use it for CRPS type II, which involves confirmed nerve injury, or for pain conditions without a documented CRPS diagnosis. Do not guess the side if the record does not specify left.
Coding tip
Verify both laterality and CRPS type in the assessment before assigning G90.522.