Acute apical periodontitis of pulpal origin

This code signifies an acute inflammatory process affecting the periapical tissues, specifically originating from an infection or necrosis within the dental pulp. It represents a painful condition characterized by inflammation around the root apex of a tooth, typically due to bacterial invasion from a carious lesion or trauma.

Use this code for patients presenting with acute pain, tenderness to percussion, and possibly swelling localized to the apex of a tooth, where clinical and radiographic findings confirm pulpal involvement as the etiology. Documentation should clearly indicate an acute inflammatory state of the periapical tissues directly linked to a non-vital or infected pulp.

• Differentiate from chronic apical periodontitis (K04.5) based on the acute nature of symptoms and clinical presentation.
• Ensure documentation specifies "pulpal origin" to distinguish from other forms of periodontitis.
• Remember the Excludes1 note: never code with K05.2- (acute periodontitis), as K04.4 specifically denotes a pulpal etiology.