ICD-10-CM G99: Other disorders of nervous system in diseases classified elsewhere

ICD-10-CM Diagnosis Code (2025)

Official Description for G99

Other disorders of nervous system in diseases classified elsewhere

Coding Notes & Guidelines for G99

Excludes1: Not Coded Here

diabetic autonomic neuropathy (E08-E13 with .43)

Excludes1: Not Coded Here
  • myelopathy in:
  • intervertebral disease (M50.0-, M51.0-)
  • spondylosis (M47.0-, M47.1-)
Excludes1: Not Coded Here
  • nervous system involvement in:
  • cysticercosis (B69.0)
  • rubella (B06.0-)
  • syphilis (A52.1-)
Code First
  • underlying disease, such as:
  • amyloidosis (E85.-)
  • gout (M1A.-, M10.-)
  • hyperthyroidism (E05.-)
Code First
  • underlying disease, such as:
  • neoplasm (C00-D49)
Code First
  • underlying disorder, such as:
  • amyloidosis (E85.-)
  • avitaminosis (E56.-)

Child Codes (More Specific Codes for G99):

G99.0 - Autonomic neuropathy in diseases classified elsewhere G99.2 - Myelopathy in diseases classified elsewhere G99.8 - Other specified disorders of nervous system in diseases classified elsewhere

About ICD-10-CM Code G99 (Other disorders of nervous system in diseases classified elsewhere)

ICD-10-CM code G99 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM G99 became effective on October 1, 2024.

This page provides detailed information about G99 - Other disorders of nervous system in diseases classified elsewhere. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Other disorders of nervous system in diseases classified elsewhere.