J18.8 is a billable ICD-10 code used to specify a medical diagnosis of other pneumonia, unspecified organism. The code is valid during the fiscal year 2023 from October 01, 2022 through September 30, 2023 for the submission of HIPAA-covered transactions.

Multifocal atrial tachycardia is an unusual variant of ectopic atrial tachycardia. As seen in Figure 4, it is characterized by an irregular rhythm with clearly visible P-waves (on the contrary to atrial fibrillation ) but the P-wave morphology varies from one beat to another.