C03.1 Malignant neoplasm of lower gum

Billable ICD-10-CM code, FY2026.

Applies from C03 Malignant neoplasm of gum

Includes

• malignant neoplasm of alveolar (ridge) mucosa
• malignant neoplasm of gingiva

Excludes2 (not included here)

• malignant odontogenic neoplasms (C41.0-C41.1)

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)

• 143.1 Malignant neoplasm of lower gum

Code annotations containing back-references to C03.1

Back-references to C03.1

• Type 2 Excludes: C41.1 Malignant neoplasm of mandible ("lower (C03.1)")

Nearby codes

• C03 Malignant neoplasm of gum
• C03.0 Malignant neoplasm of upper gum
• C03.1 Malignant neoplasm of lower gum (this code)
• C03.9 Malignant neoplasm of gum, unspecified