An ED visit involvingNSTEMIwith abnormal troponin, EKG confirmation, and escalation to cardiology for admission representshigh acuityand high risk of morbidity/mortality, supporting the highest-level ED E/M in typical CPC exam scenarios:99285. The definitive ED diagnosis isNSTEMI, which is coded asI21.4. When a definitive diagnosis is established (NSTEMI), you generally do not separately code the presenting symptomchest pain (R07.9)as an additional diagnosis unless the symptom is unrelated or specifically required; here it is the presenting symptom attributable to the MI and not separately necessary. Options A and C use inpatient consult codes (99254/99255) rather than an ED E/M code and are inappropriate for the ED provider’s service. Option D understates the acuity and incorrectly includes symptom coding as if no definitive diagnosis were made. Therefore, the correct answer is99285 with I21.4.