Underdosing of thyroid hormones and substitutes, sequela

This code signifies a long-term or residual condition resulting from the patient's insufficient intake or absorption of thyroid hormones or their substitutes. It indicates that the underdosing event itself is no longer active, but its lasting effects are still present and being addressed. This could manifest as persistent symptoms of hypothyroidism despite current, appropriate thyroid hormone therapy.

Use this code when documenting a chronic health problem directly attributable to a past episode of underdosing of thyroid medications. This is appropriate when the patient is currently stable on a new regimen, but the sequelae (e.g., cognitive impairment, persistent fatigue, cardiac issues) from the previous underdosing are still being managed. Do not use this code for acute or active underdosing.

• Always sequence this code after the code(s) for the specific sequela(e) being treated.
• Ensure documentation clearly links the current condition to a past underdosing event of thyroid hormones.
• Do not use this code if the underdosing is ongoing or if the patient is experiencing acute symptoms of underdosing; instead, use the appropriate active underdosing code.