C04.0 Malignant neoplasm of anterior floor of mouth

Billable ICD-10-CM code, FY2026.

Applicable to

• Malignant neoplasm of anterior to the premolar-canine junction

Applies from C04 Malignant neoplasm of floor of mouth

Use additional code

• code to identify:
• alcohol abuse and dependence (F10.-)
• history of tobacco dependence (Z87.891)
• tobacco dependence (F17.-)
• tobacco use (Z72.0)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 21 — Lymphoma and Other Cancers
• CMS-HCC V22: HCC 11 — Colorectal, Bladder, and Other Cancers
• RxHCC V08: HCC 22 — Prostate, Breast, Bladder, and Other Cancers and Tumors
• ESRD V24: HCC 11

MS-DRG index

Defines the logic of DRG(s) 011-013 in MDC PRE.

Approximate ICD-9-CM (GEMs)

• 144.0 Malignant neoplasm of anterior portion of floor of mouth

Nearby codes

• C04 Malignant neoplasm of floor of mouth
• C04.0 Malignant neoplasm of anterior floor of mouth (this code)
• C04.1 Malignant neoplasm of lateral floor of mouth
• C04.8 Malignant neoplasm of overlapping sites of floor of mouth
• C04.9 Malignant neoplasm of floor of mouth, unspecified