2027 ICD-10-CM Diagnosis Code G90.89Other disorders of autonomic nervous system
ICD-10-CM Codes›G00–G99›G89-G99›G90
- Billable — Valid for Submission
- Chronic Condition
G90.89 is a billable ICD-10-CM diagnosis code for other disorders of autonomic nervous system. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 73 through 74. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other nervous system disorders (neither hereditary nor degenerative).
G90.89 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
G90.89 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute pandysautonomia
- Autoimmune disorder of autonomic nerve
- Autoimmune disorder of autonomic nervous system
- Autoimmune ganglionopathy
- Autoimmune sensory ganglionopathy
- Autonomic disorder due to diphtheria
- Autonomic disorder due to encephalitis
- Autonomic ganglionopathy
- Autonomic nervous system disorder co-occurrent and due to neurodegenerative disorder
- Autonomic nervous system hyperactivity
- Autonomic neuropathy due to disorder of immune function
- Autonomic neuropathy due to sodium channelopathy
- Baroreflex failure syndrome
- Cold-induced sweating syndrome
- Disorder of autonomic nervous system caused by drug
- Disorder of autonomic nervous system due to infectious disease
- Episodic mydriasis due to parasympathetic insufficiency
- Episodic mydriasis due to sympathetic hyperactivity
- Excessive muscarinic activity
- Hereditary autonomic neuropathy
- Hypothermia-sweating syndrome
- Limited autoimmune autonomic neuropathy
- Segmental autonomic dysfunction
- Sympathetically maintained pain
- Syncope due to autonomic failure
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to G90.89: its own notes plus those printed at G90 and Chapter 6. A note printed at a category, block or chapter applies to every code under it.
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may 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)
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
nerve See Also: Disorder, nerve; G58.9
sympathetic G90.89
sympathetic nerve NEC G90.89
Disorder (of) See Also: Disease;
autonomic G90.89
sympathetic G90.89
Steinbrocker's syndrome G90.89
Sympatheticotonia G90.89
Syndrome See Also: Disease;
hand-shoulder G90.89
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Neurologic Diseases
The brain, spinal cord, and nerves make up the nervous system. Together they control all the workings of the body. When something goes wrong with a part of your nervous system, you can have trouble moving, speaking, swallowing, breathing, or learning. You can also have problems with your memory, senses, or mood.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code History & ChangesHistory
Replacement G90.89 replaces the following previously assigned code(s):
- G90.8 - Other disorders of autonomic nervous system
Questions About G90.89Overview
What is the ICD-10 code for other disorders of autonomic nervous system?
The ICD-10-CM code for other disorders of autonomic nervous system is G90.89 (sometimes written as G9089). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is G90.89 (Other disorders of autonomic nervous system) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other disorders of autonomic nervous system on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does G90.89 group to?
When other disorders of autonomic nervous system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 74, 73, with relative weights from 1.0172 to 1.5773 depending on complications. Higher weights mean higher Medicare reimbursement.
Can G90.89 be reported with G31.2?
Not as a rule. The Excludes1 note at G90, which applies to G90.89, lists "dysfunction of the autonomic nervous system due to alcohol (G31.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
Does G90.89 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: G90.89 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the ESRD (V21) category 75 (Polyneuropathy).
