Emergency Medicine ICD-10-CM codes

Emergency coding legitimately relies on symptom codes because many visits end without a confirmed diagnosis: chest pain (R07.9, or R07.89 for other chest pain), abdominal pain by location (R10.31 right lower quadrant, R10.13 epigastric, R10.84 generalized), syncope (R55), dizziness (R42), and altered mental status (R41.82). Code the symptom when the workup is negative; code the confirmed condition when it is established before disposition. Do not code rule-out or suspected conditions in the outpatient ED setting.

Injury codes need the full specificity chain: site, laterality, and the 7th character A for the initial encounter, as in S93.401A (right ankle sprain), S52.501A (distal radius fracture), S06.0X0A (concussion without loss of consciousness), and S01.01XA (scalp laceration). External cause codes describing how and where the injury happened should be added when documented. T78.40XA covers unspecified allergic reaction.

The acute illness mix repeats daily: UTI (N39.0), pneumonia (J18.9), COPD exacerbation (J44.1), asthma exacerbation (J45.901), gastroenteritis (A09) with dehydration (E86.0) when treated with fluids, renal colic (N20.0), and cellulitis with laterality (L03.115, L03.116). Chronic conditions that affected ED management, such as I10, I48.91, or E11.65, belong on the claim as secondary diagnoses because they support the medical decision-making level.