Underdosing of chloramphenicol group, subsequent encounter

This code indicates that a patient is experiencing adverse effects or complications due to receiving an insufficient amount of chloramphenicol, an antibiotic, during a follow-up visit. It signifies that the underdosing event itself occurred previously, and the current encounter is for ongoing management or assessment related to that past underdosing.

Use this code when a patient presents for a follow-up appointment to address issues stemming from a previously identified underdosing of chloramphenicol. This could include monitoring for persistent infection, assessing for therapeutic failure, or managing new symptoms that have arisen due to the inadequate dosage. It is appropriate for any encounter after the initial identification of the underdosing.

• Always assign an additional code for the specific manifestation or adverse effect resulting from the underdosing.
• Ensure the "D" seventh character is used for subsequent encounters, indicating ongoing care for the underdosing.
• Distinguish from initial encounters (A) or sequela (S) when selecting the appropriate seventh character.