Adverse effect of cephalospor/oth beta-lactm antibiot, init

This code signifies an undesirable or harmful reaction experienced by a patient due to the therapeutic use of a cephalosporin or other beta-lactam antibiotic. These reactions are not due to poisoning or overdose, but rather an expected or unexpected side effect when the medication is administered correctly. This specific code is for the initial phase of treatment for such an adverse event.

Apply this code when a patient presents with symptoms such as rash, anaphylaxis, nausea, or diarrhea directly attributable to a prescribed cephalosporin (e.g., cefazolin, ceftriaxone) or other beta-lactam antibiotic (e.g., penicillin, amoxicillin). This is appropriate for the first encounter where the adverse effect is diagnosed and treatment is initiated. It should be used in conjunction with a code for the specific manifestation of the adverse effect.

• Always code the specific manifestation of the adverse effect first (e.g., R21 for rash, T78.0X for anaphylactic shock).
• Ensure documentation clearly states the antibiotic involved and that the reaction is an adverse effect, not poisoning or underdosing.
• For subsequent encounters related to the same adverse effect, use the appropriate subsequent or sequela encounter character.