Toxic effect of unsp substance, undetermined, subs encntr

This code signifies a toxic effect from an unknown substance where the intent (accidental, intentional self-harm, assault) cannot be determined. It is used for encounters following the initial treatment of the toxic effect.

Apply this code when a patient presents for follow-up care related to a toxic exposure, and the specific substance involved remains unidentified, as does the manner in which the exposure occurred. This is appropriate for subsequent visits for monitoring, further testing, or management of lingering symptoms.

• Requires an additional code to specify the manifestation of the toxic effect.
• Only use for follow-up encounters after the initial treatment of the toxic effect.
• Ensure documentation clearly states the substance is unspecified and the intent is undetermined.