AAPC - Advancing the Business of Healthcare

What is diagnosis code ?

The first of these codes is the ICD-9-CM diagnosis code describing the principal diagnosis (i.e. The condition established after study to be chiefly responsible for causing this hospitalization). The remaining codes are the ICD-9-CM diagnosis codes corresponding to additional conditions that coexisted at the time of admission, or developed subsequently, and which had an effect on the treatment received or the length of stay.

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