When reporting immunizations administered at the time of a well-child visit, is it necessary to report code Z23 or is the diagnosis for well-child visit (Z00.129) sufficient?

Both codes are reported. International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) includes a “code first” instruction at code Z23 (encounter for immunization) advising that the code for the well-child visit (eg, Z00.129, encounter for routine child health examination without abnormal findings) is the first-listed code. Code Z23 is additionally reported. Code Z23 may also be reported for immunization at encounters other than a well-child visit.

I saw 2 children in the office the day after they had a fire in their house that filled the house with smoke before anyone woke up. The fire department came and cleared the smoke. Later that day, one of the children developed cough, fever, vomiting, and runny nose. I diagnosed that child...

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