An outpatient hospital clinic visit is scheduled and documented for management of newly diagnosed hypothyroidism. During the visit the patient also mentions seasonal allergies that are not evaluated or treated. What is the correct first-listed diagnosis approach?
Select an answer to reveal the explanation.
Short Explanation
Outpatient first-listed is “why did you book this appointment?”—not every side comment in the room. New hypothyroidism management is the reason for the visit; casual allergy chatter that nobody treated stays off the starting slot.
Full Explanation
For outpatient encounters, the first-listed diagnosis is the primary reason for the encounter as documented. Conditions mentioned but not evaluated or treated generally do not displace that reason. Coders should not substitute unrelated or incidental complaints for the documented focus of the visit when selecting first-listed diagnosis.