Poisoning by thyroid hormones and sub, undet, sequela

This code signifies a long-term or residual effect resulting from a past poisoning event involving thyroid hormones or their synthetic replacements, where the intent of the poisoning could not be determined. This indicates that the acute phase of the poisoning has resolved, but the patient continues to experience health problems directly attributable to that past event.

Use this code when documenting a patient presenting with a chronic condition or complication that is a direct consequence of a previous, undeterminable poisoning by thyroid hormones. This applies when the original poisoning event is no longer active, but its lasting impact is being treated or monitored.

• Always assign this code as a secondary diagnosis, following the code for the specific sequela being treated.
• Ensure documentation clearly links the current condition to the past poisoning event and specifies the undetermined intent.
• Do not use this code for acute poisoning events; instead, refer to the appropriate acute poisoning codes.