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Inserts a new code entry or updates an existing code entry within a domain field's code list. This endpoint allows you to programmatically manage the valid values available in coded/lookup fields (e.g., adding a new status code, updating a description on an existing code entry).
This endpoint handles one code record at a time. To upsert multiple code values, you must make separate API calls for each code entry.
The operation uses a match-based upsert pattern: you provide one or more matchFields that the system uses to search for an existing code record. If a match is found, the record is updated with the provided values. If no match is found, a new code record is inserted.
This endpoint operates on the underlying code table associated with the specified field, not on the parent domain entity itself. For example, upserting on Claim's Custom2Code field will insert/update a record in the code table that backs Custom2Code, not a Claim record.