Poisoning by anticoagulants, undetermined, initial encounter

This code signifies an adverse event resulting from exposure to an anticoagulant medication, where the intent (accidental, intentional self-harm, assault) cannot be determined by the provider. The patient is presenting for the initial treatment of this poisoning.

Apply this code when a patient presents with signs and symptoms of anticoagulant toxicity (e.g., excessive bleeding, elevated INR) and the circumstances surrounding the exposure are unclear or undocumented. This is appropriate for the first encounter for this specific poisoning event.

• Always assign an additional code for the specific anticoagulant drug if known.
• Do not use this code if the intent is clearly documented as accidental, intentional self-harm, or assault; use the appropriate intent-specific code instead.
• Ensure the "A" for initial encounter is appropriate; subsequent encounters for the same poisoning would use "D" or "S."