Toxic effect of phenol and phenol homologues, undet, subs

This code signifies a toxic reaction to phenol or related chemical compounds where the intent of the exposure (e.g., accidental, intentional self-harm, assault) cannot be determined. The patient is presenting for follow-up care or treatment of residual effects after the initial acute phase of the poisoning.

Use this code when documenting ongoing management of a patient who previously experienced phenol poisoning of unknown intent. This applies to encounters for complications, long-term effects, or continued treatment related to the initial toxic exposure. It would be appropriate for clinic visits, rehabilitation, or further diagnostic work-ups after the initial hospitalization.

• Requires an additional code to specify the specific manifestation of the toxic effect.
• Only use for subsequent encounters; an initial encounter would use the 'A' seventh character.
• Ensure documentation clearly supports the undetermined intent and the subsequent nature of the encounter.