Underdosing of methadone, sequela

This code signifies the long-term or residual effects resulting from a patient receiving an insufficient amount of methadone. These sequelae are the chronic or delayed consequences of inadequate methadone administration, rather than the acute event itself.

Apply this code when documenting conditions that are a direct result of historical underdosing of methadone, such as persistent withdrawal symptoms, relapse into opioid use disorder, or complications arising from uncontrolled pain due to insufficient methadone. This code is appropriate for chronic or resolved underdosing events where the current condition is a lasting consequence.

• Always use this code as a secondary diagnosis, following the code for the specific sequela being treated.
• Ensure documentation clearly links the current condition to a past underdosing of methadone.
• Do not use for acute underdosing events; this code is specifically for sequelae.