Underdosing of cardi-stim glycos/drug simlar act, subs

This code indicates that a patient is experiencing adverse effects or complications due to taking less than the prescribed or recommended dose of a cardiac-stimulant glycoside or a drug with similar action. This underdosing is causing a health problem and is being addressed during a follow-up visit.

Use this code when a patient presents for ongoing management of a condition exacerbated or caused by insufficient intake of medications like digoxin, and the encounter is not the initial treatment for the underdosing event. This applies to situations where the patient is not taking enough of the medication, either intentionally or unintentionally, and it is impacting their cardiac health.

• Always assign an additional code for the specific adverse effect or condition resulting from the underdosing.
• Ensure the encounter is a "subsequent encounter" (D) and not an initial encounter (A) or sequela (S).
• Distinguish underdosing from poisoning (overdosing or wrong substance), which uses different code categories.