ICD-10-CM 2027
ICD-10 code for acute sialoadenitis
From the official ICD-10-CM alphabetic index entry “Sialoadenitis (any gland) (periodic) (suppurative) › acute”. Page updated September 29, 2026.
About coding acute sialoadenitis
The ICD-10-CM code for acute sialoadenitis is K11.21 (Acute sialoadenitis). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on K11.21.
Within K11.2 (sialoadenitis), K11.21 is specifically for acute sialoadenitis. Related codes cover unspecified (K11.20), acute recurrent sialoadenitis (K11.22) and chronic sialoadenitis (K11.23).
Don't report K11.21 together with the conditions in its Excludes1 note: acute recurrent sialoadenitis (K11.22).
Use an additional code to identify: alcohol abuse and dependence (F10.-), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.
More specific acute sialoadenitis codes (official index)
- recurrent K11.22 — Acute recurrent sialoadenitis
Don't confuse with (Excludes1 for K11.21)
- acute recurrent sialoadenitis (K11.22)
Common questions about acute sialoadenitis ICD-10 codes
What is the ICD-10 code for acute sialoadenitis?
- K11.21 — Acute sialoadenitis. More specific codes apply when the documentation supports them: K11.22.
What is the ICD-10 code for recurrent acute sialoadenitis?
- K11.22 — Acute recurrent sialoadenitis.
Is K11.21 billable?
- Yes. K11.21 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can K11.21 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict K11.21 as a principal diagnosis.
Is K11.21 a CC or MCC?
- No. K11.21 is neither a CC nor an MCC under MS-DRG v44.0.