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v1.0.0
ICD-10 Guide
DiagnosesMastoid Effusion

Mastoid Effusion

ICD-10 Coding for Mastoid Effusion(H74.8X1, H74.8X2, H74.8X9)

PRIMARY SPECIALTYOtolaryngology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Mastoid Effusion?
Essential facts and insights about Mastoid Effusion

Key Clinical Considerations:

  • Ear pain or discomfort
  • Hearing loss
  • Fluid behind the eardrum observed via otoscopy

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including symptoms and duration
  • Results of otoscopic examination
  • Any imaging studies performed (e.g., CT scan)

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding ear disorders
  • Common errors include misclassifying the type of effusion

Code Exclusions

Important Exclusions

  • Chronic otitis media
  • Acute otitis media
  • Other ear disorders

Related ICD-10 Codes

Primary Codes
H65.1
Mastoid effusion
Ancillary Codes
H90.3
Differential Codes
H70.90
H74.8X1
for non-infectious effusion.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Otolaryngology

Specialty Applications

  • Pediatric and adult populations
  • Outpatient and inpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document the patient's symptoms, examination findings, and any treatments provided.

Billing considerations?

Ensure accurate coding to reflect the diagnosis and any associated procedures.