A56 vs P39.1
A56 (Other sexually transmitted chlamydial diseases) compared with P39.1 (Neonatal conjunctivitis and dacryocystitis), 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 P39.1: “neonatal chlamydial conjunctivitis (P39.1)”
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 | P39.1Neonatal conjunctivitis and dacryocystitis | |
|---|---|---|
| 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). | Neonatal conjunctivitis and dacryocystitis is a billable ICD-10-CM diagnosis code (P39.1). |
| Includes | sexually transmitted diseases due to Chlamydia trachomatis | Neonatal chlamydial conjunctivitis Ophthalmia neonatorum NOS |
| Use additional code | — | code to identify organism or specific infection |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources