Which statement is not true of diagnosis coding?

a. Diagnoses are classified to a valid ICD-10-CA code.
b. Diagnosis type is applied to all ICD-10-CA codes recorded on a DAD abstract.
c. Prefix Q is applied to a diagnosis that the physician documents as questionable.
d. Problem type is applied to all ICD-10-CA codes recorded on a NACRS abstract.
e. Z codes cannot be assigned on a NACRS abstract.