C43.121Billable
Malignant melanoma of left upper eyelid, including canthus
- Chapter
- 2. Neoplasms
- Category
- C43
- Effective date
- October 1, 2026
Related codes in category C43
C43Malignant melanoma of skinC43.0Malignant melanoma of lipYesC43.1Malignant melanoma of eyelid, including canthusC43.10Malignant melanoma of unspecified eyelid, including canthusYesC43.11Malignant melanoma of right eyelid, including canthusC43.111Malignant melanoma of right upper eyelid, including canthusYesC43.112Malignant melanoma of right lower eyelid, including canthusYesC43.12Malignant melanoma of left eyelid, including canthusC43.122Malignant melanoma of left lower eyelid, including canthusYesC43.2Malignant melanoma of ear and external auricular canalC43.20Malignant melanoma of unsp ear and external auricular canalYesC43.21Malignant melanoma of right ear and external auricular canalYes
Frequently asked questions
What is ICD-10 code C43.121?
C43.121 is an ICD-10-CM diagnosis code for Malignant melanoma of left upper eyelid, including canthus.
Is C43.121 a billable code?
Yes. C43.121 is billable and specific enough to be used on a claim.
What ICD-10-CM chapter is C43.121 in?
C43.121 falls under Chapter 2: Neoplasms.
When did C43.121 become effective?
C43.121 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to C43.121?
C43.121 belongs to category C43, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.