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H70.8

H70.8: Other mastoiditis and related conditions

Non-billable headerICD-10-CM

H70.8 is a non-billable header ICD-10-CM code for other mastoiditis and related conditions. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

  • preauricular sinus and cyst (Q18.1)
  • sinus, fistula, and cyst of branchial cleft (Q18.0)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead H70.8

2 child codes. Green means billable.

Other codes under H70

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.