As the weather turns cold, influenza season heats up. Influenza often peaks in winter and, for coding purposes, is reported based on a physician or other qualified health care professional’s diagnostic statement regardless of whether laboratory testing has confirmed the condition (eg, may be based on known circulating strains). International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) guidelines and conventions for reporting influenza and related conditions include

Codes for influenza by type are included in Table 1. See the notes in italics to identify additional coding conventions.

A child presents to the physician’s office with respiratory symptoms that began approximately 24 hours earlier. Rapid testing result for influenza A/B is positive for influenza A (negative for influenza B). The physician prescribes an antiviral medication. Diagnosis is influenza type A.

The physician did not diagnose a particular strain of influenza virus (eg, H1N1) in this example (as...

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