Blister (nonthermal) of throat, initial encounter

This code signifies a non-burn-related blister formation within the pharyngeal region, encompassing the tonsils, soft palate, and posterior pharyngeal wall. It indicates the first time a patient is receiving active treatment for this specific injury.

Apply this code when documentation clearly states a blister in the throat that is not caused by heat, chemicals, or radiation. Supporting documentation would include physician notes detailing the presence, location, and non-thermal etiology of the blister, along with an indication that this is the initial presentation or treatment for this injury.

• Ensure the documentation explicitly rules out thermal, chemical, or radiation causes for the blister.
• Verify that the encounter is indeed the "initial encounter" for this specific injury; subsequent care would require a different seventh character.
• Differentiate from codes for stomatitis or pharyngitis, which describe inflammation rather than a distinct blister.