You have two years left to prepare for the diagnosis coding shift.
Come 2013 when ICD-9 transitions to ICD-10 you'll list four digits for these patients: J18.9 (Pneumonia, unspecified organism).
ICD difference: Category J18 (Pneumonia, unspecified organism) provides codes for reporting several different types of pneumonia when you don't know the organism responsible for the condition. These include:
J18.0 (Bronchopneumonia, unspecified organism);
J18.1 (Lobar pneumonia, unspecified organism);
J18.2 (Hypostatic pneumonia, unspecified organism);
J19.8 (Other pneumonia, unspecified organism); and
J18.9.
In ICD-9, the unspecified organism codes for these different types of pneumonia were broken out across several code categories.