Is K11.21 a billable ICD-10-CM code?

Yes. K11.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does K11.21 sit in the tabular list?

Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).

What cannot be coded together with K11.21?

K11.21 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 K11.21 (K11.2) and apply to it just the same.

K11.21

K11.21 — Acute sialoadenitis

Billable / specific codeICD-10-CM

K11.21 is a billable, specific ICD-10-CM code for acute sialoadenitis. It is valid for submission on a claim.

Excludes1 — never code together

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

acute recurrent sialoadenitis (K11.22)

Excludes1 inherited from the categories above K11.21

These are not written on K11.21, but they bind it: a note on a category applies to every code beneath it. Billing K11.21 with anything listed here is a denial.

Written on K11.2 — Sialoadenitis

epidemic parotitis (B26.-)
mumps (B26.-)
uveoparotid fever [Heerfordt] (D86.89)

Risk adjustment

K11.21 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

K11.21 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

How K11.21 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to K11.21.

Sialoadenitis›acute

Code history

K11.21 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 K11.2. If K11.21 is not quite right, the correct code is usually one of these.

Questions about K11.21

Is K11.21 a billable ICD-10-CM code?: Yes. K11.21 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does K11.21 sit in the tabular list?: Diseases of the digestive system (K00-K95), in the block Diseases of oral cavity and salivary glands (K00-K14).
What cannot be coded together with K11.21?: K11.21 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 K11.21 (K11.2) and apply to it just the same.