G90.8 Other disorders of autonomic nervous systemNon-billable header with 2 child codes.
337.9 Unspecified disorder of autonomic nervous system (approximate)G90.521 Complex regional pain syndrome I of right lower limbG90.522 Complex regional pain syndrome I of left lower limbG90.523 Complex regional pain syndrome I of lower limb, bilateralG90.529 Complex regional pain syndrome I of unspecified lower limbG90.59 Complex regional pain syndrome I of other specified siteG90.8 Other disorders of autonomic nervous system (this code)G90.81 Serotonin syndromeG90.89 Other disorders of autonomic nervous systemG90.9 Disorder of the autonomic nervous system, unspecifiedG90.A Postural orthostatic tachycardia syndrome [POTS]G90.B LMNB1-related autosomal dominant leukodystrophy