D31

D31 is an alphanumeric designation used in a variety of classification systems, routing schemes, and product naming conventions. It does not carry a universal meaning on its own; its interpretation depends on the domain and the specific system in which it appears.

In medical coding, D31 appears within ICD-10-CM as part of the code range used for benign neoplasms. The single code D31 does not specify a tissue or organ by itself; the exact site is identified by additional digits in the full code used for patient records, billing, and epidemiological statistics. This structure allows clinicians and coders to convey both the general class of tumor and its location.

In transportation and public transit, D31 can designate a line, route segment, district identifier, or service code within a particular network. Such designations aid in scheduling, wayfinding, and operations but are specific to the transit system in which they are used, so the same label could have different meanings in different cities or countries.

In manufacturing and consumer electronics, D31 may appear as a model number, part number, or catalog identifier. As with other product codes, it serves to distinguish a particular variation or component rather than to provide descriptive information about its function.

Because D31 has multiple, context-dependent meanings, its precise significance is determined by the field and the accompanying documentation or identifiers in that context.