Atrophy of thyroid (acquired)

This code represents the acquired shrinkage or wasting away of the thyroid gland, which is not present at birth. This atrophy leads to a reduction in the gland's size and function, typically resulting in hypothyroidism. It signifies a non-congenital cause for the diminished thyroid tissue.

Use this code when documentation specifies acquired atrophy of the thyroid gland, often identified through imaging studies or biopsy. This diagnosis is appropriate for patients presenting with symptoms of hypothyroidism where the underlying cause is determined to be a non-congenital reduction in thyroid tissue. Supporting documentation should clearly indicate the acquired nature of the atrophy.

• Always differentiate between acquired and congenital atrophy; congenital atrophy is excluded.
• Code any associated hypothyroidism separately, as this code describes the anatomical change, not the functional deficiency.
• Ensure documentation explicitly states "acquired atrophy" or provides clinical context ruling out a congenital origin.