ICD-10 Code A36.8 – Other diphtheria (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A36.8 – Other diphtheria
What it is
A36.8 identifies diphtheria infections that do not fit a more specific site or form. Use it when documentation says diphtheria, but does not specify pharyngeal, laryngeal, cutaneous, or another defined type.
Clinical signs
Clinical features vary; refer to documentation. Diphtheria may present with sore throat, fever, and a gray adherent membrane, but the exact site and severity depend on the recorded diagnosis.
When to use this code
Use A36.8 when the provider documents “other diphtheria” or describes diphtheria without naming a standard subtype. It is also appropriate when the record confirms diphtheria but the available note does not support a more specific code. If the chart gives a precise anatomic form, choose that code instead.
Do not use for
Do not use this code for a clearly documented diphtheria subtype such as pharyngeal or cutaneous disease. Do not assign it when the record only suggests exposure, screening, or suspected infection; check documentation.
Coding tip
Code the most specific diphtheria type documented, and fall back to A36.8 only when the record truly lacks a more precise description.