Undrdose of immune checkpoint inhibtr/immunostim drugs, init

This code signifies that a patient has received less than the prescribed or intended dose of an immune checkpoint inhibitor or other immunostimulant medication. This underdosing could be due to various reasons, potentially impacting the drug's efficacy in treating conditions like cancer or autoimmune disorders.

Use this code when documenting the initial encounter where underdosing of these specific drug classes is identified or addressed. This includes situations where a patient self-administers an insufficient dose, a medication error leads to underdosing, or a physician intentionally reduces the dose for clinical reasons that are not otherwise specified as a complication.

• Always assign an additional code from categories T36-T50 to identify the specific drug that was underdosed.
• This code is for the initial encounter; subsequent encounters for the same underdosing event would use the appropriate subsequent encounter or sequela character.
• Distinguish underdosing from non-compliance (Z91.1-); underdosing implies a quantity issue, not necessarily a refusal to take the medication.