K11.21 is the authoritative medical code for Acute sialoadenitis. This classification is used in medical billing and clinical recording to specify the clinical criteria for acute sialoadenitis (ICD-10-CM K11.21), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Acute sialoadenitis is a billable ICD-10-CM diagnosis code K11.21. Excludes1 (not coded here): acute recurrent sialoadenitis K11.22; epidemic parotitis B26.-; mumps B26.-; uveoparotid fever Heerfordt. Use additional code: 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; tobacco dependence F17.-; tobacco use Z72.0.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for K11.21 in the official ICD-10-CM tabular list.
Excludes1 — Not Coded Here
Conditions that can never be reported with this code; the two are mutually exclusive.
- acute recurrent sialoadenitis K11.22
- epidemic parotitis B26.-
- mumps B26.-
- uveoparotid fever Heerfordt
Use Additional Code
Supplementary codes the tabular list directs you to add.
- 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
- tobacco dependence F17.-
- tobacco use Z72.0
Frequently Asked Questions (FAQ) & Clinical Guidance
What can't be coded together with K11.21?
Per Excludes1 instructions, K11.21 must not be reported with: acute recurrent sialoadenitis (K11.22); epidemic parotitis (B26.-); mumps (B26.-); uveoparotid fever [Heerfordt] (D86.89).
Is an additional code needed with K11.21?
Use additional code(s) to specify: 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).
Codes in This Family (14)
Official ICD-10-CM classifications in the same code family as K11.21, with their registry titles.
- K11 — Diseases of salivary glands
- K11.0 — Atrophy of salivary gland
- K11.1 — Hypertrophy of salivary gland
- K11.2 — Sialoadenitis
- K11.20 — Sialoadenitis, unspecified
- K11.22 — Acute recurrent sialoadenitis
- K11.23 — Chronic sialoadenitis
- K11.3 — Abscess of salivary gland
- K11.4 — Fistula of salivary gland
- K11.5 — Sialolithiasis
- K11.6 — Mucocele of salivary gland
- K11.7 — Disturbances of salivary secretion
- K11.8 — Other diseases of salivary glands
- K11.9 — Disease of salivary gland, unspecified
Indexed Clinical Terms (1)
Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.
- Sialoadenitis (any gland) (periodic) (suppurative), acute
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures: