Is H70.891 a billable ICD-10-CM code?

Yes. H70.891 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does H70.891 sit in the tabular list?

Diseases of the ear and mastoid process (H60-H95), in the block Diseases of middle ear and mastoid (H65-H75).

What cannot be coded together with H70.891?

H70.891 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above H70.891 (H70.8) and apply to it just the same.

H70.891

H70.891 — Other mastoiditis and related conditions, right ear

Billable / specific codeICD-10-CMright

H70.891 is a billable, specific ICD-10-CM code for other mastoiditis and related conditions, right ear. It is valid for submission on a claim.

Excludes1 inherited from the categories above H70.891

These are not written on H70.891, but they bind it: a note on a category applies to every code beneath it. Billing H70.891 with anything listed here is a denial.

Written on H70.8 — Other mastoiditis and related conditions

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

Risk adjustment

H70.891 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

H70.891 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A57204Billing and Coding: MRI and CT Scans of the Head and Neck

Code history

H70.891 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share H70.89. If H70.891 is not quite right, the correct code is usually one of these.

Questions about H70.891

Is H70.891 a billable ICD-10-CM code?: Yes. H70.891 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does H70.891 sit in the tabular list?: Diseases of the ear and mastoid process (H60-H95), in the block Diseases of middle ear and mastoid (H65-H75).
What cannot be coded together with H70.891?: H70.891 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above H70.891 (H70.8) and apply to it just the same.