ICD-10-CM > G00-G99 > G89-G99 > G90 > G90.5 > G90.51 G90.51 Complex regional pain syndrome I of upper limb Non-Billable/Non-Specific Codes G90.511Complex regional pain syndrome I of right upper limbG90.512Complex regional pain syndrome I of left upper limbG90.513Complex regional pain syndrome I of upper limb, bilateralG90.519Complex regional pain syndrome I of unspecified upper limb