What diagnosis code does Medicare need to cover this lab test? I need this information at my fingertips." Ever wonder exactly what diagnosis codes are covered for a particular lab test? STAT NCD lists the specific ICD-9 codes listed in the new Medicare National Coverage Determinations (NCD's). Use this new software to find covered diagnoses for 23 common lab tests in an easy-to-use format similar to STAT ICD-9 Coder. Recovering even a single non-covered test will completely pay for this tool. Stop paying for your patient's lab tests!