ICD-10 Code C55 – Malignant neoplasm of uterus, part unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C55 – Malignant neoplasm of uterus, part unspecified
What it is
C55 identifies a malignant tumor arising in the uterus when the specific uterine part is not documented. Use it when the record confirms uterine cancer but does not specify cervix, corpus, or another site.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include abnormal uterine bleeding, pelvic pain, or an enlarging uterine mass, but the diagnosis should be supported by pathology or clear clinician documentation.
When to use this code
Use C55 when the provider documents “malignant neoplasm of uterus” without naming the exact uterine location. It also fits when the site is described as uterine, unspecified, or otherwise not further characterized in the chart. If the record later identifies the exact site, code that more specific diagnosis instead.
Do not use for
Do not use C55 for cervical cancer, endometrial cancer, or other specifically documented uterine sites. Check documentation if the lesion is benign, metastatic to the uterus, or if the primary site is unclear.
Coding tip
Query the provider when the note says “uterine cancer” but does not specify the involved part.