Poisoning by anticoagulants, undetermined, sequela

This code signifies a long-term complication or residual effect stemming from an anticoagulant poisoning where the intent (accidental, intentional self-harm, assault, or therapeutic error) could not be determined. It indicates that the acute phase of the poisoning has passed, but the patient continues to experience health problems directly attributable to the past exposure.

Apply this code when documenting a patient presenting with chronic health issues, such as persistent bleeding disorders, organ damage, or neurological deficits, that are definitively linked to a prior, unclassified anticoagulant poisoning. This is appropriate for follow-up encounters after the initial poisoning event has been resolved and the patient is being treated for the lasting effects.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., chronic anemia, kidney failure).
• Ensure documentation clearly links the current condition to the past undetermined anticoagulant poisoning.
• Do not use this code for acute poisoning events; instead, refer to the appropriate acute poisoning codes (T45.511-T45.514 with A, D, or S for initial, subsequent, or sequela encounters).