ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesH70.0

H70.0

Billable

Acute mastoiditis

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/12/2025

Code Description

ICD-10 H70.0 is a billable code used to indicate a diagnosis of acute mastoiditis.

Key Diagnostic Point:

Acute mastoiditis is an inflammatory condition of the mastoid process, typically resulting from an untreated or inadequately treated acute otitis media. It is characterized by the presence of infection in the mastoid air cells, leading to symptoms such as ear pain, fever, and swelling behind the ear. Patients may present with tenderness over the mastoid area, erythema, and sometimes drainage from the ear. The condition can lead to serious complications, including hearing loss, meningitis, or abscess formation if not promptly treated. Diagnosis is primarily clinical, supported by imaging studies such as CT scans to assess the extent of the disease. Management often involves antibiotic therapy, and in severe cases, surgical intervention such as mastoidectomy may be necessary to drain infected material and prevent complications. Early recognition and treatment are crucial to prevent progression to chronic mastoiditis or other serious sequelae.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acute and chronic mastoiditis
  • Need for imaging studies to confirm diagnosis
  • Potential for surgical intervention complicating coding
  • Variability in clinical presentation among patients

Audit Risk Factors

  • Inadequate documentation of clinical findings
  • Failure to document imaging results
  • Misclassification of acute versus chronic conditions
  • Lack of detail in treatment plans

Specialty Focus

Medical Specialties

Otolaryngology

Documentation Requirements

Detailed clinical notes on symptoms, examination findings, and treatment plans.

Common Clinical Scenarios

Patients presenting with ear pain, fever, and swelling behind the ear.

Billing Considerations

Ensure documentation reflects the severity of the condition and any surgical interventions performed.

Pediatrics

Documentation Requirements

Thorough history of ear infections, family history, and growth parameters.

Common Clinical Scenarios

Children with recurrent otitis media leading to acute mastoiditis.

Billing Considerations

Consider age-related factors in treatment and documentation of developmental milestones.

Coding Guidelines

Inclusion Criteria

Use H70.0 When
  • Follow official coding guidelines for acute mastoiditis, ensuring accurate documentation of symptoms, imaging, and treatment
  • Include any associated conditions such as otitis media in coding

Exclusion Criteria

Do NOT use H70.0 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

69436CPT Code

Mastoidectomy

Clinical Scenario

Performed when medical management fails and surgical intervention is necessary.

Documentation Requirements

Document the indication for surgery, findings during the procedure, and post-operative care.

Specialty Considerations

Otolaryngologists must ensure all surgical notes are detailed and correlate with the diagnosis.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of acute mastoiditis, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of acute mastoiditis, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of acute mastoiditis, improving the accuracy of diagnosis and treatment tracking. This specificity aids in better patient management and resource allocation.

Resources

Clinical References

  • •
    American Academy of Otolaryngology - Head and Neck Surgery

Coding & Billing References

  • •
    American Academy of Otolaryngology - Head and Neck Surgery

Frequently Asked Questions

What are the common symptoms of acute mastoiditis?

Common symptoms include ear pain, fever, swelling behind the ear, and drainage from the ear. Patients may also experience hearing loss.

How is acute mastoiditis diagnosed?

Diagnosis is primarily clinical, supported by imaging studies such as CT scans to assess the extent of the infection in the mastoid air cells.

What is the typical treatment for acute mastoiditis?

Treatment typically involves antibiotics, and in severe cases, surgical intervention such as mastoidectomy may be necessary.

Can acute mastoiditis lead to complications?

Yes, if not treated promptly, acute mastoiditis can lead to serious complications such as hearing loss, meningitis, or abscess formation.