ICD-10 Code G90.521 – Complex regional pain syndrome I of right lower limb (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G90.521 – Complex regional pain syndrome I of right lower limb
What it is
G90.521 identifies complex regional pain syndrome type I affecting the right lower limb. Use it when the record describes ongoing regional pain after an injury or trigger, without evidence of a confirmed nerve injury.
Clinical signs
Typical findings include disproportionate pain, swelling, skin color or temperature changes, and reduced movement 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 right leg, ankle, foot, or other right lower-limb site. It fits cases where the condition is clearly localized to the right lower extremity and no nerve lesion is identified. Check documentation if laterality or type is unclear.
Do not use for
Do not use it for CRPS type II, which requires a documented nerve injury, or for pain syndromes that are not diagnosed as CRPS. Do not assume the code from pain alone; confirm the provider’s diagnosis.
Coding tip
Verify both laterality and CRPS type in the note before assigning G90.521.