Home Care Clinical Specialist – OASIS (HCS-O) Certification Practice Test

In OASIS documentation, influenza vaccine status is captured with a dedicated M-code in the immunization area, and the code that signifies the patient actually received the influenza vaccine is M1041. This code directly reflects influenza immunization status within the data set, enabling consistent recording and reporting. The other codes shown correspond to different items within the same coding system and do not indicate that an influenza vaccine was received. When in doubt, always verify against the current OASIS manual, since code assignments can vary by version.