Malignant neoplasms of ill-defined, other secondary and unspecified sites (C76-C80)

ICD-10 codes C76 through C80 cover malignant neoplasms arising from ill-defined, secondary, or unspecified sites in the body. These codes are specifically used when the primary tumor location is ambiguous, when cancer has spread to secondary sites like lymph nodes or organs, or when the overall site is unspecified.

This range includes detailed codes for malignant neoplasms of ill-defined sites such as the head, neck, thorax, abdomen, pelvis, and limbs (C76). It also covers secondary malignant neoplasms, or metastases, of lymph nodes (C77), respiratory and digestive organs (C78), other and unspecified sites including organs like skin, brain, bone, ovary, adrenal gland, and breast (C79). The codes clarify distinctions between specific regions whenever the malignancy has metastasized, such as right versus left lung or kidney. Finally, C80 codes classify malignant neoplasms without specification of site or with widespread dissemination, including those associated with transplanted organs. Synonyms like "adenocarcinoma of neck" or "metastatic carcinoma to lymph nodes of head and neck" directly link common cancer terms to precise codes for accurate medical coding and documentation.