A18.81 Tuberculosis of thyroid gland

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

MS-DRG index

Defines the logic of DRG(s) 643-645 in MDC 10.

Approximate ICD-9-CM (GEMs)

• 017.50 Tuberculosis of thyroid gland, unspecified (approximate)

Code annotations containing back-references to A18.81

Back-references to A18.81

• Type 1 Excludes: E35 Disorders of endocrine glands in diseases classified elsewhere ("tuberculosis of thyroid gland (A18.81)")

Back-references to A18

• Type 2 Excludes: A31 Infection due to other mycobacteria ("tuberculosis (A15-A19)")

Diagnosis Index entries for A18.81

• Thyroiditis › tuberculous
• Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) › thyroid gland

Nearby codes

• A18.54 Tuberculous iridocyclitis
• A18.59 Other tuberculosis of eye
• A18.6 Tuberculosis of (inner) (middle) ear
• A18.7 Tuberculosis of adrenal glands
• A18.8 Tuberculosis of other specified organs
• A18.81 Tuberculosis of thyroid gland (this code)
• A18.82 Tuberculosis of other endocrine glands
• A18.83 Tuberculosis of digestive tract organs, not elsewhere classified
• A18.84 Tuberculosis of heart
• A18.85 Tuberculosis of spleen
• A18.89 Tuberculosis of other sites