Toxic effect of carbon dioxide, undetermined, init encntr

This code signifies a patient presenting with adverse health effects resulting from exposure to carbon dioxide, where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined from the medical record. The patient is experiencing the acute, initial phase of these toxic effects.

This code is appropriate for emergency department visits or initial inpatient admissions where a patient exhibits symptoms of carbon dioxide poisoning, such as headache, dizziness, nausea, shortness of breath, or loss of consciousness, and the circumstances surrounding the exposure are unclear or undocumented. It should be used when the medical record does not specify whether the exposure was accidental, intentional, or due to assault.

• Always assign an additional code for the specific manifestations of the carbon dioxide toxicity (e.g., respiratory failure, cerebral edema).
• Only use the "A" seventh character for the initial encounter for treatment of the toxic effect. Subsequent care would use "D" or "S".
• Avoid this code if the intent of the carbon dioxide exposure is clearly documented as accidental (T59.7X1-), intentional self-harm (T59.7X2-), or assault (T59.7X3-).