Underdosing of oth hormones and synthetic substitutes, subs

This code signifies that a patient is experiencing adverse effects or complications due to receiving an insufficient amount of a prescribed hormone or synthetic substitute, excluding adrenal cortical steroids, insulin, and estrogen. The underdosing is not the initial event but rather a follow-up encounter for ongoing management or assessment of the issue.

Apply this code when a patient presents for treatment or monitoring related to the underdosing of various hormones (e.g., thyroid hormones, growth hormones) or synthetic substitutes, after the initial underdosing event has occurred. This includes situations where the patient's condition is worsening or not improving due to inadequate medication levels.

• Always use a secondary code to identify the specific hormone or synthetic substitute that was underdosed.
• Ensure the documentation clearly indicates that this is a subsequent encounter, not the initial presentation of the underdosing.
• Distinguish this from noncompliance (Z91.1xx) if the patient intentionally did not take the medication as prescribed.