FY2027 ICD-10-CM reference
G90: Disorders of autonomic nervous system
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Disorders of autonomic nervous system. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Nonbillable heading. Verified against the official FY2027 order file.
More specific FY2027 codes
- G90.0: Idiopathic peripheral autonomic neuropathyNonbillable heading
- G90.1: Familial dysautonomia [Riley-Day]Billable code
- G90.2: Horner's syndromeBillable code
- G90.3: Multi-system degeneration of the autonomic nervous systemBillable code
- G90.4: Autonomic dysreflexiaBillable code
- G90.5: Complex regional pain syndrome I (CRPS I)Nonbillable heading
- G90.8: Other disorders of autonomic nervous systemNonbillable heading
- G90.9: Disorder of the autonomic nervous system, unspecifiedBillable code
- G90.A: Postural orthostatic tachycardia syndrome [POTS]Billable code
- G90.B: LMNB1-related autosomal dominant leukodystrophyBillable code
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Excludes2
certain conditions originating in the perinatal period (P04-P96)
Source: G00-G99 (chapter, inherited).
Excludes2
certain infectious and parasitic diseases (A00-B99)
Source: G00-G99 (chapter, inherited).
Excludes2
complications of pregnancy, childbirth and the puerperium (O00-O9A)
Source: G00-G99 (chapter, inherited).
Excludes2
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
Source: G00-G99 (chapter, inherited).
Excludes2
endocrine, nutritional and metabolic diseases (E00-E88)
Source: G00-G99 (chapter, inherited).
Excludes2
injury, poisoning and certain other consequences of external causes (S00-T88)
Source: G00-G99 (chapter, inherited).
Excludes2
neoplasms (C00-D49)
Source: G00-G99 (chapter, inherited).
Excludes2
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Source: G00-G99 (chapter, inherited).
Excludes1
dysfunction of the autonomic nervous system due to alcohol (G31.2)
Source: G90 (category, direct).
Compare the FY2027 additions, removals and billable-status changes
What does G90 mean in FY2027?
The official ICD-10-CM descriptor is Disorders of autonomic nervous system. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is G90 billable in FY2027?
The FY2027 order file marks G90 as a nonbillable heading. Select a complete billable child code.
Does G90 map to an HCC?
Risk-model mapping is not applicable to this nonbillable heading. Check a complete billable child code.
Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.
Review the FY2026 April edition