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 CodesH70.1

H70.1

Billable

Chronic mastoiditis

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

Code Description

ICD-10 H70.1 is a billable code used to indicate a diagnosis of chronic mastoiditis.

Key Diagnostic Point:

Chronic mastoiditis is a persistent inflammatory condition of the mastoid air cells, typically resulting from unresolved or recurrent otitis media. It is characterized by the presence of fluid, infection, and inflammation in the mastoid process, which can lead to complications such as hearing loss, facial nerve paralysis, and intracranial infections if left untreated. Patients often present with symptoms such as ear pain, discharge from the ear, and hearing impairment. Chronic mastoiditis may develop following acute mastoiditis or as a result of chronic otitis media, where the infection spreads from the middle ear to the mastoid air cells. Diagnosis is typically confirmed through clinical evaluation, imaging studies such as CT scans, and audiometric testing to assess hearing loss. Management may involve medical treatment with antibiotics and, in some cases, surgical intervention such as mastoidectomy to remove infected tissue and restore normal ear function.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiating between acute and chronic mastoiditis
  • Understanding the relationship with otitis media
  • Identifying complications that may arise
  • Documentation of symptoms and treatment plans

Audit Risk Factors

  • Inadequate documentation of chronicity
  • Failure to document associated symptoms
  • Misclassification of acute vs. chronic conditions
  • Lack of imaging studies to support diagnosis

Specialty Focus

Medical Specialties

Otolaryngology

Documentation Requirements

Detailed history of ear infections, audiometric evaluations, and imaging results.

Common Clinical Scenarios

Patients presenting with recurrent ear infections, persistent ear discharge, or hearing loss.

Billing Considerations

Ensure clear documentation of the duration of symptoms and any prior treatments.

Primary Care

Documentation Requirements

Comprehensive patient history, including previous episodes of otitis media and treatment responses.

Common Clinical Scenarios

Patients with a history of ear infections presenting with new or worsening symptoms.

Billing Considerations

Document referral to specialists when necessary and any follow-up care provided.

Coding Guidelines

Inclusion Criteria

Use H70.1 When
  • Follow official ICD
  • 10 guidelines for coding chronic conditions
  • Ensure that documentation supports the chronic nature of the condition and any associated complications
  • Include relevant history of otitis media and treatment responses

Exclusion Criteria

Do NOT use H70.1 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

69436CPT Code

Mastoidectomy

Clinical Scenario

Performed for chronic mastoiditis with complications.

Documentation Requirements

Operative report detailing the procedure and indications.

Specialty Considerations

Otolaryngology specialists should ensure comprehensive documentation of pre-operative evaluations.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of chronic mastoiditis, improving the accuracy of data collection and reimbursement processes. It emphasizes the need for detailed documentation of chronic conditions and their management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of chronic mastoiditis, improving the accuracy of data collection and reimbursement processes. It emphasizes the need for detailed documentation of chronic conditions and their management.

Reimbursement & Billing Impact

reimbursement processes. It emphasizes the need for detailed documentation of chronic conditions and their management.

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 chronic mastoiditis?

Common symptoms include persistent ear pain, discharge from the ear, hearing loss, and sometimes fever or facial weakness.

How is chronic mastoiditis diagnosed?

Diagnosis is typically made through clinical evaluation, patient history, imaging studies such as CT scans, and audiometric testing.

What treatments are available for chronic mastoiditis?

Treatment options include antibiotics, surgical intervention such as mastoidectomy, and management of associated conditions like otitis media.