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A18.81

Billable

Tuberculosis of thyroid gland

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

This is a tuberculosis infection that has spread to the thyroid gland, the butterfly-shaped gland in the neck that controls metabolism. It is a rare form of extrapulmonary tuberculosis where the TB bacteria infect thyroid tissue.

Coding Tips

  • •This code is part of the tuberculosis chapter (A15-A19) and should only be used when TB of the thyroid is confirmed, not suspected; verify documentation confirms tuberculosis involvement of the thyroid specifically
  • •This is a manifestation code that may require an additional code to identify the type of TB (such as drug-resistant TB) if applicable; always check for any associated pulmonary TB or other organ involvement that should be coded separately

Code Hierarchy

└A18Tuberculosis of other organs└A18.8Tuberculosis of other specified organs└A18.81Tuberculosis of thyroid gland
└A18.81Tuberculosis of thyroid gland

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