G90 — Disorders of autonomic nervous system
Is G90 billable?
No — G90 is a non-billable header code. G90 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 21 billable codes beneath G90.
Billable codes under this header
- G90.1Familial dysautonomia [Riley-Day]
- G90.2Horner's syndrome
- G90.3Multi-system degeneration of the autonomic nervous system
- G90.4Autonomic dysreflexia
- G90.9Disorder of the autonomic nervous system, unspecified
- G90.APostural orthostatic tachycardia syndrome [POTS]
- G90.BLMNB1-related autosomal dominant leukodystrophy
- G90.01Carotid sinus syncope
- G90.09Other idiopathic peripheral autonomic neuropathy
- G90.50Complex regional pain syndrome I, unspecified
- G90.59Complex regional pain syndrome I of other specified site
- G90.81Serotonin syndrome
- G90.89Other disorders of autonomic nervous system
- 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
- G90.521Complex 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 at a glance
| Code | G90 |
|---|---|
| Description | Disorders of autonomic nervous system |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together
The conditions below can never be reported together with G90 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- dysfunction of the autonomic nervous system due to alcohol (G31.2)
Excludes2 — not included here — inherited from Chapter 6
The conditions below are not part of G90, but a patient may have both at the same time. When documentation supports it, G90 and the excluded code may both be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
What codes fall under G90? (10)
- G90.0Idiopathic peripheral autonomic neuropathynot billable
- 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)not billable
- G90.8Other disorders of autonomic nervous systemnot billable
- G90.9Disorder of the autonomic nervous system, unspecified
- G90.APostural orthostatic tachycardia syndrome [POTS]
- G90.BLMNB1-related autosomal dominant leukodystrophy
How long has G90 existed?
G90 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
Which codes are confused with G90?
ICD-10-CM declares these codes mutually exclusive with G90 — exactly one of each pair can be correct for a given encounter.