Peritonsillar abscess

This code represents a collection of pus located behind the tonsil, typically a complication of acute tonsillitis. It manifests as severe sore throat, difficulty swallowing, fever, and often a "hot potato" voice due to swelling.

Apply this code when documentation clearly indicates a diagnosis of peritonsillar abscess. This diagnosis is usually supported by physical examination findings such as unilateral tonsillar swelling, uvular deviation, and fluctuance, often confirmed by aspiration or imaging.

• Differentiate from simple tonsillitis (ICD-9-CM 463) or pharyngitis (ICD-9-CM 462) where an abscess is not present.
• Consider an additional code for the underlying acute tonsillitis if still active and documented.
• Ensure documentation specifies "abscess" and not just severe inflammation or cellulitis.