A56 vs P23.1
A56 (Other sexually transmitted chlamydial diseases) compared with P23.1 (Congenital pneumonia due to Chlamydia), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. A56 carries an Excludes1 note covering P23.1: “neonatal chlamydial pneumonia (P23.1)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| A56Other sexually transmitted chlamydial diseases | P23.1Congenital pneumonia due to Chlamydia | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | A00-B99 — Certain Infectious and Parasitic Diseases (A00-B99) | P00-P96 — Certain Conditions Originating in the Perinatal Period (P00-P96) |
| Definition | Other sexually transmitted chlamydial diseases is a non-billable ICD-10-CM category code (A56). | Congenital pneumonia due to Chlamydia is a billable ICD-10-CM diagnosis code (P23.1). |
| Includes | sexually transmitted diseases due to Chlamydia trachomatis | infective pneumonia acquired in utero or during birth |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources