ICD-10 Code K20.9 – Esophagitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K20.9 – Esophagitis, unspecified
What it is
K20.9 identifies inflammation of the esophagus when the provider documents esophagitis but does not specify the cause or type. Use it for nonspecific esophageal inflammation only.
Clinical signs
Common findings include painful swallowing, difficulty swallowing, chest discomfort, or reflux-related irritation. Clinical features vary; refer to documentation.
When to use this code
Use K20.9 when the record states esophagitis and does not name reflux, eosinophilic, infectious, or other specific etiologies. It also fits when the note confirms inflammation of the esophagus but gives no further detail. Check documentation if the cause is described elsewhere.
Do not use for
Do not use this code when the provider documents a more specific type of esophagitis. Avoid it if the chart supports another diagnosis or if esophageal symptoms are present without confirmed esophagitis.
Coding tip
Code the most specific esophagitis diagnosis documented; if specificity is missing, K20.9 is the default.