ICD-10 code for autonomic nervous system disorder

The ICD-10-CM code for autonomic nervous system disorder is G90.9 (Disorder of the autonomic nervous system, unspecified). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G90.9.

Within G90, choose G90.9 (Disorder of the autonomic nervous system, unspecified) only when documentation doesn't support a more specific option: idiopathic peripheral autonomic neuropathy (G90.0), familial dysautonomia [Riley-Day] (G90.1), Horner's syndrome (G90.2), Multi-system degeneration of the autonomic nervous system (G90.3), autonomic dysreflexia (G90.4), complex regional pain syndrome I (CRPS I) (G90.5), other disorders of autonomic nervous system (G90.8), postural orthostatic tachycardia syndrome [POTS] (G90.A) and 1 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 073 (Cranial and Peripheral Nerve Disorders with MCC, relative weight 1.5779) and DRG 074 (Cranial and Peripheral Nerve Disorders without MCC, relative weight 1.0173), in MDC 01 (Diseases and Disorders of the Nervous System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.