J17Pneumonia in diseases classified elsewhere

J17 is the ICD-10-CM diagnosis code for pneumonia in diseases classified elsewhere. It belongs to block J09-J18 (influenza and pneumonia) and chapter 10 (diseases of the respiratory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report J17 together with the conditions in its Excludes1 note: candidial pneumonia (B37.1), chlamydial pneumonia (J16.0), gonorrheal pneumonia (A54.84), histoplasmosis pneumonia (B39.0-B39.2) and 19 more.

Code first underlying disease, such as: Q fever (A78), rheumatic fever (I00) and schistosomiasis (B65.0-B65.9).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 177 (Respiratory Infections and Inflammations with MCC, relative weight 1.6092), DRG 178 (Respiratory Infections and Inflammations with CC, relative weight 0.9744) and DRG 179 (Respiratory Infections and Inflammations without CC/MCC, relative weight 0.7345), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 484.7 (pneumonia in other systemic mycoses), 484.8 (pneumonia in other infectious diseases classified elsewhere) and 517.1 (rheumatic pneumonia).