H70.1 Chronic mastoiditis

Name of the Condition

• Chronic mastoiditis

Summary

Chronic mastoiditis is a persistent inflammation or infection of the mastoid bone, a structure located behind the ear. It typically develops as a complication of long-standing middle ear infections (otitis media) and is characterized by a prolonged course of symptoms. The condition involves the mastoid air cells and may lead to structural changes or persistent discharge if not addressed.

Causes

Chronic mastoiditis is most commonly caused by bacterial infections that spread from the middle ear, often resulting from recurrent or untreated otitis media. The infection can extend into the mastoid bone over time, leading to chronic inflammation. Other potential causes include persistent blockages in the Eustachian tube, structural abnormalities, or inadequate treatment of acute mastoiditis.

Risk Factors

• Recurrent or chronic middle ear infections
• Untreated or poorly managed otitis media
• Eustachian tube dysfunction
• Immunocompromised states
• Prior ear surgery or trauma
• Age (more common in children due to smaller Eustachian tubes)

Symptoms

• Persistent pain, swelling, or tenderness behind the ear
• Chronic ear discharge or drainage
• Hearing loss or muffled hearing
• Redness or warmth over the mastoid area
• Possible facial nerve involvement (rare)
• Headache or dizziness

Diagnosis

Diagnosis is typically made through a physical examination of the ear and mastoid area, along with a review of the patient’s medical history. Imaging studies, such as a CT scan, may be used to assess the extent of inflammation or structural changes in the mastoid bone. Cultures of ear discharge may help identify the causative bacteria.

Treatment Options

Treatment often involves long-term antibiotic therapy to address the underlying infection. In some cases, surgical intervention, such as a mastoidectomy, may be necessary to remove infected tissue or improve drainage. Pain management and supportive care, including ear cleaning or hearing aids, may also be part of the treatment plan.

Prognosis and Follow-Up

With appropriate treatment, the prognosis for chronic mastoiditis is generally good, though recovery may be prolonged. Regular follow-up appointments are important to monitor for recurrence or complications. Patients may require ongoing management of underlying conditions, such as Eustachian tube dysfunction, to prevent future episodes.

Complications

• Hearing loss (permanent or temporary)
• Spread of infection to nearby structures (e.g., brain, inner ear)
• Facial nerve paralysis
• Chronic ear discharge
• Structural damage to the mastoid bone

Lifestyle & Prevention

• Manage middle ear infections promptly to prevent progression.
• Avoid smoking or exposure to secondhand smoke, which can worsen Eustachian tube function.
• Practice good ear hygiene, avoiding insertion of objects into the ear.
• Stay up-to-date with vaccinations, including those for pneumococcal and influenza, to reduce infection risk.

When to Seek Professional Help

Seek medical attention if you experience persistent ear pain, discharge, or hearing changes, especially if accompanied by fever, headache, or swelling behind the ear. Early intervention can help prevent complications.

Tips for Medical Coders

When coding for chronic mastoiditis (H70.1), ensure documentation supports the chronic nature of the condition, including duration, recurrent episodes, or prior treatment failures. Note any associated complications or underlying causes, such as chronic otitis media, to support accurate code assignment.