In which block would you enter diagnosis codes on the CMS-1500 form?

Diagnosis codes are entered in Block 21 of the CMS-1500 form. This block is specifically designated for reporting individual diagnosis codes related to the services provided to the patient. Each diagnosis code should align with the treatment rendered and is linked to the medical necessity of the care.

This block allows providers to detail the specific conditions for which medical services were necessary. Properly entering these codes is crucial, as they are used by insurance companies to process claims and determine eligibility for payment. Accurate representation of diagnosis through these codes also helps in future treatment planning and patient care continuity.