ICD-10 Code C57.3 – Malignant neoplasm of parametrium (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C57.3 – Malignant neoplasm of parametrium
What it is
This code identifies a malignant tumor arising in the parametrium, the connective tissue beside the uterus. Use it when the provider documents cancer in this specific pelvic site.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a pelvic mass, abnormal bleeding, pain, or evidence of local invasion on exam or imaging.
When to use this code
Use C57.3 when the record clearly states primary malignancy of the parametrium. It is appropriate for confirmed cancer diagnoses, including cases described by pathology, imaging, or specialist assessment. If the site is uncertain or another gynecologic origin is documented, check documentation before assigning this code.
Do not use for
Do not use this code for benign parametrium conditions, inflammatory disease, or metastatic disease to the parametrium from another primary site. Check documentation if the cancer origin is not specifically identified.
Coding tip
Assign the code only when the parametrium is named as the malignant site in the provider’s documentation.