Carcinoma in situ of thyroid and other endocrine glands

This code signifies the presence of abnormal, non-invasive cell growth confined to the epithelial layer of the thyroid gland or other endocrine glands, excluding the pancreas, ovaries, and testes. These cells have the potential to become cancerous but have not yet invaded surrounding tissues. It represents a pre-malignant condition.

Use this code when pathology reports confirm carcinoma in situ of the thyroid gland, adrenal gland, parathyroid gland, pituitary gland, or pineal gland. Documentation must explicitly state "carcinoma in situ" and specify the affected endocrine gland. This code is appropriate when surgical excision or biopsy reveals these specific findings.

• Ensure the pathology report explicitly states "carcinoma in situ" and not a more advanced stage of malignancy.
• Verify the specific endocrine gland involved to avoid miscoding with other in situ conditions.
• Remember the Excludes1 notes; do not code this with carcinoma in situ of the endocrine pancreas, ovary, or testis.