ICD-10-CM > G00-G99 > G50-G59 > G57 > G57.7 G57.7 Causalgia of lower limb Non-Billable/Non-Specific Applicable To Complex regional pain syndrome II of lower limb Type 1 Excludes complex regional pain syndrome I of lower limb (G90.52-)complex regional pain syndrome I of upper limb (G90.51-)complex regional pain syndrome II of upper limb (G56.4-)reflex sympathetic dystrophy of lower limb (G90.52-)reflex sympathetic dystrophy of upper limb (G90.51-) Codes G57.70Causalgia of unspecified lower limbG57.71Causalgia of right lower limbG57.72Causalgia of left lower limbG57.73Causalgia of bilateral lower limbs