Underdosing of unspecified narcotics, subsequent encounter

This code signifies that a patient is experiencing adverse effects or complications due to taking less than the prescribed or recommended dose of an unspecified narcotic medication. This underdosing is occurring during a follow-up visit for the initial underdosing event. The specific type of narcotic is not documented.

Apply this code when a patient presents for ongoing management of symptoms or conditions directly resulting from insufficient narcotic intake, and the specific narcotic is unknown or not specified in the medical record. This is appropriate for subsequent encounters after the initial underdosing has been identified.

• Ensure documentation clearly indicates "underdosing" and that the encounter is not the initial presentation.
• Only use this code when the specific narcotic cannot be identified; otherwise, use a more specific code from the T40.6 series.
• This code requires an additional code to describe the specific manifestation or adverse effect of the underdosing.