ICD-10 Code A63 – Other predominantly sexually transmitted diseases, not elsewhere classified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A63 – Other predominantly sexually transmitted diseases, not elsewhere classified
What it is
This code covers sexually transmitted infections or conditions that are mainly spread through sexual contact but do not fit a more specific ICD-10 category. Use it when the record identifies an STI-like condition, but the exact disease is not named.
Clinical signs
Clinical features vary; refer to documentation. Findings may include genital lesions, discharge, irritation, or other STI-related symptoms, but the specific diagnosis should be documented before coding.
When to use this code
Use A63 when the clinician documents a sexually transmitted disease that is not classified elsewhere and does not provide a more specific code. It may also apply when the note states an unspecified or atypical STI-related condition. If the organism or disease is identified, code the more specific diagnosis instead.
Do not use for
Do not use this code for infections with a clearly documented specific ICD-10 code, such as syphilis, gonorrhea, or chlamydial infection. Also avoid it when the condition is not sexually transmitted or when documentation is too vague; check documentation.
Coding tip
Code A63 only after confirming the provider has documented a sexually transmitted condition that lacks a more specific diagnosis.