H70.013 Subperiosteal abscess of mastoid, bilateral

Name of the Condition

• Subperiosteal abscess of mastoid, bilateral

Summary

Subperiosteal abscess of mastoid, bilateral, is a localized collection of pus between the periosteum (the outer membrane) of both mastoid bones and the bone itself. It typically arises as a complication of acute mastoiditis, an infection of the mastoid air cells. The condition involves the spread of infection from the middle ear or mastoid air cells into the subperiosteal space, leading to pain, swelling, and potential systemic symptoms if not addressed promptly.

Causes

Subperiosteal abscess of mastoid, bilateral, is most commonly caused by bacterial infections that spread from the middle ear or mastoid air cells, often due to untreated or severe acute otitis media. Bacteria such as Streptococcus pneumoniae, Haemophilus influenzae, or Staphylococcus aureus may extend into the subperiosteal space, forming an abscess. The infection can result from blockages in the Eustachian tube, trauma to the ear, or immunocompromised states that impair the body’s ability to contain the infection.

Risk Factors

• Untreated or severe acute otitis media
• Recurrent middle ear infections
• Eustachian tube dysfunction
• Age (more common in children due to smaller Eustachian tubes)
• Immunocompromised states
• Recent ear surgery or trauma

Symptoms

• Pain, swelling, or tenderness behind both ears
• Ear discharge or drainage
• Fever or chills
• Headache
• Hearing loss or muffled hearing
• Redness or warmth behind the ears
• Irritability (especially in children)

Diagnosis

Diagnosis involves a thorough clinical evaluation, including a physical examination of the ears and surrounding areas. Imaging studies such as a CT scan of the temporal bones may be used to confirm the presence and extent of the abscess. Laboratory tests, including blood cultures or ear discharge cultures, can help identify the causative bacteria. A thorough history of recent ear infections or trauma is also considered.

Treatment Options

Treatment typically includes antibiotic therapy to target the underlying infection, often administered intravenously initially. Surgical drainage of the abscess may be necessary to relieve pressure and promote healing. Pain management and supportive care, such as fever reduction, are also important. In some cases, tympanostomy tubes may be placed to improve middle ear ventilation.

Prognosis and Follow-Up

With prompt and appropriate treatment, the prognosis is generally good. Most patients recover fully without long-term complications. Follow-up care includes monitoring for resolution of symptoms and ensuring the infection has cleared. Regular hearing assessments may be recommended, especially in cases involving hearing loss.

Complications

If left untreated, complications can include hearing loss, spread of infection to nearby structures (such as the brain or meninges), or chronic mastoiditis. Rarely, it may lead to more severe systemic infections or neurological issues.

Lifestyle & Prevention

Preventive measures include prompt treatment of acute otitis media, avoiding exposure to known ear infection triggers, and maintaining good ear hygiene. For individuals with recurrent infections, addressing underlying issues like Eustachian tube dysfunction may reduce risk. Immunocompromised patients should take extra precautions to avoid infections.

When to Seek Professional Help

Seek immediate medical attention if you experience severe ear pain, swelling behind the ears, fever, or signs of systemic infection. Early intervention is critical to prevent complications and ensure proper treatment.

Tips for Medical Coders

When coding for subperiosteal abscess of mastoid, bilateral (H70.013), ensure documentation clearly specifies bilateral involvement. Verify that the condition is distinguished from unilateral or unspecified cases. Accurate clinical documentation of symptoms, diagnostic findings, and treatment is essential for correct code assignment.