Disorders of autonomic nervous system
In Other disorders of the nervous system (G89-G99), chapter 6: Diseases of the Nervous System
21 billable codes under G90: 11 are a CC; 3 map to HCC 182 (Spinal Cord Disorders/Injuries), HCC 199 (Parkinson and Other Degenerative Disease of Basal Ganglia), HCC 200 (Friedreich and Other Hereditary Ataxias; Huntington Disease).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.
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Instructional notes
Excludes1: not coded here, use a different code
- dysfunction of the autonomic nervous system due to alcohol (G31.2)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Covers default dominant or nondominant side for hemiplegia and monoplegia, and use and sequencing of G89 pain codes, including postoperative, chronic, and neoplasm-related pain.
- Dominant/nondominant side (page 45)
- Pain - Category G89 (page 45)
All codes under G90
G90 can't be used on a claim. Pick a billable code below; grey headings group them.
- G90.0Idiopathic peripheral autonomic neuropathy
- G90.01Carotid sinus syncope
- G90.09Other idiopathic peripheral autonomic neuropathy
- G90.1Familial dysautonomia [Riley-Day]
- G90.2Horner's syndrome
- G90.3Multi-system degeneration of the autonomic nervous system
- G90.4Autonomic dysreflexia
- G90.5Complex regional pain syndrome I (CRPS I)
- G90.50Complex regional pain syndrome I, unspecified
- G90.51Complex regional pain syndrome I of upper limb
- G90.511Complex regional pain syndrome I of right upper limb
- G90.512Complex regional pain syndrome I of left upper limb
- G90.513Complex regional pain syndrome I of upper limb, bilateral
- G90.519Complex regional pain syndrome I of unspecified upper limb
- G90.52Complex regional pain syndrome I of lower limb
- G90.521Complex regional pain syndrome I of right lower limb
- G90.522Complex regional pain syndrome I of left lower limb
- G90.523Complex regional pain syndrome I of lower limb, bilateral
- G90.529Complex regional pain syndrome I of unspecified lower limb
- G90.59Complex regional pain syndrome I of other specified site
- G90.8Other disorders of autonomic nervous system
- G90.81Serotonin syndrome
- G90.89Other disorders of autonomic nervous system
- G90.9Disorder of the autonomic nervous system, unspecified
- G90.APostural orthostatic tachycardia syndrome [POTS]
- G90.BLMNB1-related autosomal dominant leukodystrophy
G90 MS-DRGs
As the principal diagnosis, the billable codes under G90 group to these 9 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 073 Cranial and Peripheral Nerve Disorders with MCC (18 of 21 codes)
- DRG 074 Cranial and Peripheral Nerve Disorders without MCC (18 of 21 codes)
- DRG 091 Other Disorders of Nervous System with MCC (2 of 21 codes)
- DRG 092 Other Disorders of Nervous System with CC (2 of 21 codes)
- DRG 093 Other Disorders of Nervous System without CC/MCC (2 of 21 codes)
- DRG 791 Prematurity with Major Problems (2 of 21 codes)
- DRG 793 Full Term Neonate with Major Problems (2 of 21 codes)
- DRG 056 Degenerative Nervous System Disorders with MCC (1 of 21 codes)
- DRG 057 Degenerative Nervous System Disorders without MCC (1 of 21 codes)
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Autonomic Nervous System Disorders
Your autonomic nervous system is the part of your nervous system that controls involuntary actions, such as the beating of your heart and the widening or narrowing of your blood vessels. When something goes wrong in this system, it can cause serious problems, including:
Read more about autonomic nervous system disorders on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.