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Home/Diagnosis/ICD-10 Coding for Mastoid Conditions

ICD-10 Coding for Mastoid Conditions

H70.90
H71.21

Complete ICD-10-CM coding and documentation guide for icd-10 coding for mastoid conditions includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Mastoiditis
Cholesteatoma
Mastoid Abscess
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Key Information: ICD-10 Coding for Mastoid Conditions

Essential facts and insights about ICD-10 Coding for Mastoid Conditions

Use ICD-10 code H70.90 for acute mastoiditis, unspecified ear, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Acute mastoiditis, unspecified ear

Billable Code
H70.90
Billable

Diagnostic Criteria

clinical:
  • • Presence of mastoid tenderness and swelling
documentation:
  • • Lack of laterality documentation

Applicable To

  • • Acute mastoiditis without specification of laterality

Important Notes

  • • Ensure laterality is documented to avoid unspecified coding.

Cholesteatoma of mastoid, right ear

Billable Code
H71.21
Billable

Diagnostic Criteria

clinical:
  • • Imaging showing keratinizing squamous epithelium in mastoid
  • • Presence of a pearly white mass

Applicable To

  • • Cholesteatoma involving the mastoid in the right ear

Important Notes

  • • Ensure the specific location and laterality are documented.
Ancillary Codes

Additional codes that may be used with this diagnosis

B95.0

Streptococcus, group A, as the cause of diseases classified elsewhere

Use to specify the bacterial cause of mastoiditis.

H95.2-

Postprocedural mastoid complications

Use for complications following mastoid surgery.

Frequently Asked Questions

What is the ICD-10 code for mastoiditis?

The ICD-10 code for unspecified acute mastoiditis is H70.90. For specified laterality, use H70.91 for the right ear and H70.92 for the left ear.

How is cholesteatoma coded in ICD-10?

Cholesteatoma of the mastoid is coded as H71.21 for the right ear and H71.22 for the left ear, depending on the affected side.

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