ICD-10 Code A36.0 – Pharyngeal diphtheria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A36.0 – Pharyngeal diphtheria
What it is
Pharyngeal diphtheria is a bacterial infection of the throat caused by toxin-producing Corynebacterium diphtheriae. It primarily affects the pharynx and can form a thick membrane.
Clinical signs
Typical findings include sore throat, fever, and difficulty swallowing, with a gray or white adherent pseudomembrane in the throat. Clinical features vary; refer to documentation.
When to use this code
Use A36.0 when the provider documents diphtheria involving the pharynx or throat, including pharyngeal membrane formation. Use it for confirmed or clinically diagnosed pharyngeal diphtheria when the site is clearly stated. Check documentation if multiple sites are mentioned.
Do not use for
Do not use this code for nonspecific pharyngitis, tonsillitis, or diphtheria at another anatomic site. If the record does not specify pharyngeal involvement, check documentation.
Coding tip
Code the documented anatomic site exactly; diphtheria site specificity matters for correct ICD-10-CM assignment.