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ICD Hub / Diseases of the ear or mastoid process (H60–H95) / AA40.0 - Exostosis of external auditory canal
ICD-11

ICD-11 Codes
for AA40.0 - Exostosis of external auditory canal
Teodor Jurukovski January 1, 1970
Fact checked by: Teodor Jurukovski
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Factors Contributing to Ear Canal Exostosis

Exostosis of the external auditory canal is primarily attributed to repeated exposure to cold water, leading to a bony response, often referred to as "surfer's ear." Prolonged exposure to cold wind and water can irritate the ear canal's skin, stimulating bone growth.

Other Names for Exostosis of the External Auditory Canal

Exostosis of the external auditory canal is also commonly known by several other terms, including:
  • Surfer's ear
  • External auditory exostosis (EAE)
  • Bony growths in the ear canal

Understanding Exostosis of the External Auditory Canal

Exostosis of the external auditory canal, identified by the ICD-11 code AA40.0, refers to the development of benign bony growths that project outward from the bone surface within the ear canal. These growths can occur in one or both ear canals and may lead to partial or complete blockage. This condition is a type of acquired deformity of the external auditory canal.

How Exostosis of the External Auditory Canal is Diagnosed

Diagnosis of exostosis of the external auditory canal typically involves a physical examination of the ear using an otoscope. Medical professionals look for the characteristic bony growths within the ear canal. Audiometric testing may be performed to assess the degree of hearing loss, if any. The ICD-11 code for this condition is AA40.0.

Recognising the Signs of Exostosis

Many individuals with exostosis of the external auditory canal may not experience any symptoms, especially if the growths are small. However, as the bony protrusions enlarge, they can cause symptoms such as:
  • A feeling of fullness or blockage in the ear.
  • Reduced hearing or conductive hearing loss.
  • Increased susceptibility to ear infections due to trapped water and debris.
  • Tinnitus (ringing in the ears).
  • Pain, particularly after swimming or exposure to cold water.

Coding and Billing for Exostosis of the External Auditory Canal

For accurate medical billing and documentation, the specific ICD-11 code AA40.0 should be used for Exostosis of external auditory canal. This code helps classify the condition for reporting purposes. When documenting, healthcare providers may note the presence of bony growths, the extent of obstruction, and any associated symptoms like hearing loss or recurrent infections. This information is crucial for appropriate coding and reimbursement.

Managing Exostosis of the External Auditory Canal

Management strategies for exostosis of the external auditory canal depend on the severity of symptoms and the degree of canal obstruction. For asymptomatic or mild cases, conservative measures such as avoiding triggers (e.g., cold water) and maintaining ear hygiene are often sufficient. When symptoms are significant or hearing is impaired, surgical removal of the bony growths may be recommended to restore the ear canal's patency and prevent complications. This procedure aims to improve hearing and reduce the risk of infections.

Frequently asked questions

What is ICD-11 code AA40.0 and what does it describe?
AA40.0 is the ICD-11 code for Exostosis of external auditory canal, describing a benign bony growth projecting outward from a bone surface within the external auditory canal.
How is Exostosis of the external auditory canal classified within ICD-11?
Exostosis of the external auditory canal (AA40.0) is classified as a type of Acquired deformity of external auditory canal (AA40).
Can laterality be specified when coding AA40.0 in ICD-11?
Yes, laterality for AA40.0 can be specified through postcoordination using extension codes such as 'Right', 'Left', or 'Bilateral'.
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