How do you know which code is primary and secondary when you have more then one code?

To determine which code is primary and which is secondary when multiple codes are present, you typically follow specific coding guidelines or conventions relevant to the context, such as medical coding or programming. The primary code usually represents the main diagnosis or procedure that necessitates the treatment, while secondary codes provide additional details or context. Factors such as the hierarchy of the codes, their relevance to the main issue, and specific coding rules set by relevant authorities (like the ICD for medical coding) can help clarify their roles. Always refer to the official coding guidelines for precise direction.