C43

C43 is an alphanumeric designation used in several unrelated domains. Its meaning depends on the context in which it appears.

In medical coding, C43 designates malignant melanoma of the skin in the ICD-10-CM system. This code covers melanomas arising on the skin and is further subdivided by specific sites (for example, regions of the face or other skin areas) to reflect the primary location of the tumor. Clinically, malignant melanoma is a serious skin cancer that requires staging and can be treated with surgical excision, with adjuvant therapies considered based on stage, molecular features, and other risk factors. The code is used for record-keeping, billing, and epidemiological reporting.

In U.S. military aviation, C-43 has been used as a designation for transport aircraft, indicating a non-combat, personnel- or cargo-carrying role. The designation is applied to aircraft that are often derived from civil airliners and operated by the Air Force or Navy for various support tasks, including VIP transport and routine missions. The exact aircraft associated with the C-43 designation has changed over time as platforms are updated or reassigned.

Beyond medicine and aviation, C43 can appear as a model, product, or catalog code in other organizations, or as part of regional or infrastructural designations. Because C43 lacks a single universal meaning, identifying the intended reference requires additional contextual information.