J13 vs J18.1
J13 (Pneumonia due to Streptococcus pneumoniae) compared with J18.1 (Lobar pneumonia, unspecified organism), 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. J13 carries an Excludes1 note covering J18.1: “lobar pneumonia, unspecified organism (J18.1)”
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
| J13Pneumonia due to Streptococcus pneumoniae | J18.1Lobar pneumonia, unspecified organism | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | J00-J99 — Diseases of the Respiratory System (J00-J99) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Pneumonia due to Streptococcus pneumoniae is a billable ICD-10-CM diagnosis code (J13). | Lobar pneumonia, unspecified organism is a billable ICD-10-CM diagnosis code (J18.1). |
| Includes | Bronchopneumonia due to S. pneumoniae | — |
| Use additional code | code, if applicable, to identify resistance to antimicrobial drugs (Z16.-) | code, if applicable, to identify resistance to antimicrobial drugs (Z16.-) |
| Code first | , if applicable, associated influenza (J09.X1, J10.0-, J11.0-) | , if applicable, associated influenza (J09.X1, J10.0-, J11.0-) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources