ICD-11 Codes
for AA04 - Perichondritis of external ear

Teodor Jurukovski January 1, 1970

Fact checked by: Teodor Jurukovski

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Understanding Perichondritis of the External Ear

Perichondritis of the external ear, identified by the ICD-11 code AA04, is an infection affecting the perichondrium, the tissue layer that surrounds the cartilage of the outer ear. This condition, also known as auricular perichondritis or pinna perichondritis, primarily impacts the auricle or pinna, distinguishing it from infections of the earlobe. Prompt medical attention is crucial to prevent potential complications.

Recognizing the Signs of Perichondritis

Individuals experiencing perichondritis of the external ear often present with a painful, red, and swollen outer ear. The inflammation typically encircles an area of injury, such as a cut, scrape, or piercing site. Key symptoms may include:

• Tenderness to touch
• A feeling of warmth over the affected ear
• Fever

In more severe cases, an abscess may form, potentially leading to fluid drainage.

Factors Contributing to Perichondritis

The primary cause of perichondritis is bacterial infection, with Pseudomonas aeruginosa being a common culprit, though Staphylococcus aureus and Escherichia coli can also be involved. Bacteria typically enter the perichondrium through an injury to the ear. Common risk factors include:

• High ear cartilage piercings, which can damage the cartilage and introduce bacteria.
• Trauma to the side of the head.
• Contact sports injuries.
• Burns or insect bites.
• Acupuncture procedures on the ear.

Less frequent causes involve ear surgery, spread of untreated ear infections to the cartilage, or minor trauma like scratching. Individuals with weakened immune systems, inflammatory conditions, or diabetes may also be more susceptible.

Diagnosing Perichondritis of the External Ear

The diagnosis of perichondritis of the external ear (ICD-11 code AA04) is typically established through a thorough medical history and a physical examination. Healthcare providers will assess the ear for signs of pain, redness, swelling, and warmth, and inquire about recent ear trauma, such as piercings, burns, or other injuries.

Managing Perichondritis of the External Ear

Treatment for perichondritis generally involves antibiotics to combat the bacterial infection. The specific antibiotic and method of administration (oral or topical) depend on the infection's severity and the identified bacteria. Fluoroquinolones are frequently prescribed. If an abscess has formed and is compromising blood supply to the cartilage, surgical intervention may be necessary to drain the pus and remove any dead tissue. Supportive measures like warm compresses and over-the-counter pain relievers may also be recommended.

Alternative Names for Perichondritis of the External Ear

Perichondritis of the external ear is also referred to by several other terms, including:

• Perichondritis of auricle
• Perichondritis of pinna
• Auricular perichondritis
• Pinna perichondritis