Nonspecific abnormal results of function study of thyroid

This code signifies an abnormal finding from a thyroid function test (e.g., TSH, T3, T4 levels) that is not specific enough to diagnose a particular thyroid disorder such as hypothyroidism or hyperthyroidism. It indicates that the thyroid gland is not functioning within normal parameters, but the precise nature or cause of the dysfunction is undetermined at the time of reporting.

Use this code when laboratory results for thyroid function are outside the normal range, but the physician has not yet established a definitive diagnosis of a specific thyroid condition. This often occurs during initial screening or follow-up when further investigation is needed to pinpoint the underlying pathology. Documentation should clearly state "abnormal thyroid function study" without a more specific diagnosis.

• Do not use this code if a definitive diagnosis of hypothyroidism (e.g., 244.9) or hyperthyroidism (e.g., 242.90) has been made.
• This code is typically a temporary diagnosis while awaiting further diagnostic workup or specialist consultation.
• Always sequence this code as a secondary diagnosis if a more specific, related condition is known and being treated.