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ICD10BillableValid for clinical use

ICD-10 Code G31.86: Alexander disease

G31.86 is a billable ICD-10 diagnosis code used to classify Alexander disease in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Diseases of the nervous system (G00-G99).

When is it used?

  • May be used when a clinician documents alexander disease in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
6Diseases of the nervous system (G00-G99)
block
G30-G32Other degenerative diseases of the nervous system
category
G31Other degenerative diseases of nervous system, not elsewhere classified
category
G31.8Other specified degenerative diseases of nervous system
currentG31.8

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

NeurologistGeneral Physician

Coverage-related procedures and services

CPT 97551high
CAREGIVER TRAINING IN STRATEGIES AND TECHNIQUES TO FACILITATE THE PATIENT'S FUNCTIONAL PERFORMANCE IN THE HOME OR COMMUNITY (EG, ACTIVITIES OF DAILY LIVING [ADLS], INSTRUMENTAL ADLS [IADLS], TRANSFERS, MOBILITY, COMMUNICATION, SWALLOWING, FEEDING, PROBLEM SOLVING, SAFETY PRACTICES) (WITHOUT THE PATIENT PRESENT), FACE TO FACE; EACH ADDITIONAL 15 MINUTES (LIST SEPARATELY IN ADDITION TO CODE FOR PRIMARY SERVICE)
Source: CMS coverage guidance
CPT 97550high
CAREGIVER TRAINING IN STRATEGIES AND TECHNIQUES TO FACILITATE THE PATIENT'S FUNCTIONAL PERFORMANCE IN THE HOME OR COMMUNITY (EG, ACTIVITIES OF DAILY LIVING [ADLS], INSTRUMENTAL ADLS [IADLS], TRANSFERS, MOBILITY, COMMUNICATION, SWALLOWING, FEEDING, PROBLEM SOLVING, SAFETY PRACTICES) (WITHOUT THE PATIENT PRESENT), FACE TO FACE; INITIAL 30 MINUTES
Source: CMS coverage guidance
CPT 97535high
SELF-CARE/HOME MANAGEMENT TRAINING (EG, ACTIVITIES OF DAILY LIVING (ADL) AND COMPENSATORY TRAINING, MEAL PREPARATION, SAFETY PROCEDURES, AND INSTRUCTIONS IN USE OF ASSISTIVE TECHNOLOGY DEVICES/ADAPTIVE EQUIPMENT) DIRECT ONE-ON-ONE CONTACT, EACH 15 MINUTES
Source: CMS coverage guidance
CPT 97533high
SENSORY INTEGRATIVE TECHNIQUES TO ENHANCE SENSORY PROCESSING AND PROMOTE ADAPTIVE RESPONSES TO ENVIRONMENTAL DEMANDS, DIRECT (ONE-ON-ONE) PATIENT CONTACT, EACH 15 MINUTES
Source: CMS coverage guidance
CPT 97530high
THERAPEUTIC ACTIVITIES, DIRECT (ONE-ON-ONE) PATIENT CONTACT (USE OF DYNAMIC ACTIVITIES TO IMPROVE FUNCTIONAL PERFORMANCE), EACH 15 MINUTES
Source: CMS coverage guidance
CPT 97110high
THERAPEUTIC PROCEDURE, 1 OR MORE AREAS, EACH 15 MINUTES; THERAPEUTIC EXERCISES TO DEVELOP STRENGTH AND ENDURANCE, RANGE OF MOTION AND FLEXIBILITY
Source: CMS coverage guidance

Coding guidelines

Common synonyms

Alexander disease

Frequently asked questions

Code details

CodeG31.86
SystemICD10
Display nameAlexander disease
ChapterDiseases of the nervous system (G00-G99)
BlockOther degenerative diseases of the nervous system

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Disease, diseased

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.