Underdosing of barbiturates, sequela

This code signifies the long-term, residual effects resulting from a patient's insufficient intake or cessation of prescribed barbiturate medication. These sequelae are the chronic or permanent health problems that persist after the acute phase of underdosing has passed.

Apply this code when documenting conditions that are a direct consequence of a past underdosing of barbiturates, such as persistent neurological deficits, chronic withdrawal symptoms, or organ damage attributed to the prolonged lack of the medication. This code is appropriate for follow-up encounters addressing these lasting effects, not the acute underdosing event itself.

• Always use this code as a secondary diagnosis, following the code for the specific sequela (e.g., a code for a neurological disorder).
• Ensure documentation clearly links the current condition to a past underdosing of barbiturates.
• The "S" in the 7th character indicates sequela, meaning the residual effect of a previous injury or illness.