C58 Malignant neoplasm of placenta

Billable ICD-10-CM code, FY2026.

Includes

• choriocarcinoma NOS
• chorionepithelioma NOS

Excludes1 (never code together)

• chorioadenoma (destruens) (D39.2)
• hydatidiform mole NOS (O01.9)
• invasive hydatidiform mole (D39.2)
• male choriocarcinoma NOS (C62.9-)
• malignant hydatidiform mole (D39.2)

Applies from C58 Malignant neoplasm of placenta

Includes

• choriocarcinoma NOS
• chorionepithelioma NOS

Excludes1 (never code together)

• chorioadenoma (destruens) (D39.2)
• hydatidiform mole NOS (O01.9)
• invasive hydatidiform mole (D39.2)
• male choriocarcinoma NOS (C62.9-)
• malignant hydatidiform mole (D39.2)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 22 — Bladder, Colorectal, and Other Cancers
• CMS-HCC V22: HCC 10 — Lymphoma and Other Cancers
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 10

MS-DRG index

Defines the logic of DRG(s) 736-741 in MDC 13.

Approximate ICD-9-CM (GEMs)

• 181 Malignant neoplasm of placenta

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Diagnosis Index entries for C58

• Carcinoma (malignant) › chorionic › unspecified site › female
• Choriocarcinoma › unspecified site › female

Nearby codes

• C58 Malignant neoplasm of placenta (this code)