ICD-10 Diagnosis Code H49.1

Fourth [trochlear] nerve palsy

Diagnosis Code H49.1

ICD-10: H49.1
Short Description: Fourth [trochlear] nerve palsy
Long Description: Fourth [trochlear] nerve palsy
This is the 2017 version of the ICD-10-CM diagnosis code H49.1

Code Classification
  • Diseases of the eye and adnexa
    • Disorders of ocular muscles, binocular movement, accommodation and refraction (H49-H52)
      • Paralytic strabismus (H49)

Information for Patients

Eye Movement Disorders

When you look at an object, you're using several muscles to move both eyes to focus on it. If you have a problem with the muscles, the eyes don't work properly.

There are many kinds of eye movement disorders. Two common ones are

  • Strabismus - a disorder in which the two eyes don't line up in the same direction. This results in "crossed eyes" or "walleye."
  • Nystagmus - fast, uncontrollable movements of the eyes, sometimes called "dancing eyes"

Some eye movement disorders are present at birth. Others develop over time and may be associated with other problems, such as injuries. Treatments include glasses, patches, eye muscle exercises, and surgery. There is no cure for some kinds of eye movement disorders, such as most kinds of nystagmus.

  • Cranial mononeuropathy III
  • Cranial mononeuropathy VI
  • Eye muscle repair
  • Nystagmus
  • Strabismus
  • Supranuclear ophthalmoplegia

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