Final answer:
The BMI, coma scale, and NIHSS codes should be reported as secondary diagnoses.
Step-by-step explanation:
The BMI (Body Mass Index), coma scale, and NIHSS (National Institutes of Health Stroke Scale) codes are tools used in medical assessments. They are not diagnoses themselves but are used to measure and evaluate a patient's specific condition or state. Therefore, they should be reported as secondary diagnoses when documenting a patient's medical condition.