Underdosing of primarily systemic and hematolog agents, subs

This code indicates that a patient is experiencing the effects of receiving an insufficient amount of a medication classified as another primarily systemic and hematological agent. This underdosing is occurring during a follow-up visit or during the healing phase of the condition for which the medication was prescribed. It signifies that the therapeutic effect of the drug is not being achieved due to inadequate dosage.

Use this code when documentation clearly states that a patient's symptoms or condition are worsening or not improving because they are receiving too little of a systemic or hematological agent, such as certain immunosuppressants, anticoagulants, or antineoplastic drugs. This applies to situations where the underdosing is identified during a subsequent encounter for the same issue.

• Always sequence this code after the code(s) for the specific medical condition being treated or affected by the underdosing.
• Ensure the documentation specifies "underdosing" and identifies the drug class as a systemic or hematological agent.
• Verify that the encounter is indeed "subsequent" and not an initial encounter for the underdosing event.