Blister (nonthermal) of oral cavity, initial encounter

This code signifies the presence of a non-thermal blister within the oral cavity, such as a mucocoele, traumatic blister, or bulla not caused by heat or cold. It indicates the initial presentation or active treatment phase of this specific lesion.

Apply this code when documentation clearly identifies a blister in the oral cavity that is not due to burns or frostbite. This is appropriate for the initial evaluation and management of such a lesion, including diagnosis and the start of treatment.

• Ensure documentation specifies "nonthermal" to differentiate from burn blisters (T20-T32 series).
• Verify the encounter is the "initial encounter" for this specific injury; subsequent care would use a different seventh character.
• Consider additional codes for the underlying cause if known and clinically relevant (e.g., specific autoimmune conditions).