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ICD-10-CM Code G90.2
Horner's syndrome

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

G90.2 is a billable ICD code used to specify a diagnosis of horner's syndrome. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code G902 is used to code Horner's syndrome

Horner's syndrome (also known as Bernard-Horner syndrome and oculosympathetic palsy) is a combination of symptoms that arises when a group of nerves known as the sympathetic trunk is damaged. The signs and symptoms occur on the same side as the lesion of the sympathetic trunk. It is characterized by miosis (a constricted pupil), ptosis (a weak, droopy eyelid), apparent anhidrosis (decreased sweating), with or without enophthalmus (inset eyeball).

Specialty: Neurology
MeSH Code: D006732
ICD 9 Code: 337.9

Left-sided Horner's syndrome

Source: Wikipedia

Coding Notes for G90.2 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Bernard(-Horner) syndrome
Cervical sympathetic dystrophy or paralysis

MS-DRG Mapping

  • DRG Group #073-074 - Cranial and peripheral nerve disorders with MCC.
  • DRG Group #073-074 - Cranial and peripheral nerve disorders without MCC.

Related Concepts SNOMET-CT

  • Cervical sympathetic paralysis (disorder)
  • Horner's syndrome pupil (disorder)

ICD-10-CM Alphabetical Index References for 'G90.2 - Horner's syndrome'

The ICD-10-CM Alphabetical Index links the below-listed medical terms to the ICD code G90.2. Click on any term below to browse the alphabetical index.

Horner(-Claude Bernard) syndrome (G90.2)
Claude Bernard-Horner syndrome (G90.2)
Bernard-Horner syndrome (G90.2)


Unspecified disorder of autonomic nervous system (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code G90.2 and a single ICD9 code, 337.9 is an approximate match for comparison and conversion purposes.

Parent Code: G90 - Disorders of autonomic nervous system

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/G902