T45.1X6Underdosing of antineoplastic and immunosuppressive drugs

T45.1X6 is the ICD-10-CM diagnosis code for underdosing of antineoplastic and immunosuppressive drugs. It belongs to category T45 (poisoning by, adverse effect of and underdosing of primarily systemic and hematological agents, not elsewhere classified), block T36-T50 (poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T45.1X (poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs), T45.1X6 is specifically for underdosing of antineoplastic and immunosuppressive drugs. Related codes cover poisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional) (T45.1X1), poisoning by antineoplastic and immunosuppressive drugs, intentional self-harm (T45.1X2), poisoning by antineoplastic and immunosuppressive drugs, assault (T45.1X3), poisoning by antineoplastic and immunosuppressive drugs, undetermined (T45.1X4) and adverse effect of antineoplastic and immunosuppressive drugs (T45.1X5).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.