Underdosing of cephalospor/oth beta-lactm antibiotics, subs

This code indicates that a patient is experiencing adverse effects or complications due to receiving an insufficient amount of cephalosporin or other beta-lactam antibiotic. This underdosing could be intentional (e.g., patient non-compliance) or unintentional (e.g., prescribing error, malabsorption), and the patient is being seen for follow-up care related to this issue.

Use this code when documenting a subsequent encounter for a patient whose condition is being managed after an underdosing event involving cephalosporins or other beta-lactam antibiotics. This includes situations where the patient is still experiencing symptoms, undergoing further treatment, or being monitored for resolution of the underdosing effects.

• Always sequence this code after the code(s) for the specific condition being treated or the adverse effect(s) of the underdosing.
• Ensure documentation clearly states that the encounter is subsequent to the initial underdosing event.
• Consider additional codes for patient non-compliance (Z91.120, Z91.128) if applicable and documented.