On the exam Doctor write notes skin abnormal (Ex:nevus.hyperpigmentation, heart : Abnormal heart murmur,etc.,)

Medical decision making he refers the patient to see specialty doctor(derm/Cardi) or write notes follow-up next visit for any improvement

can I code (ICD9 Dx) and bill to the insurance company for those diagnosis.It is not going to change the CPT level (work-up is Ltd/low) 99213

My co-worker told me that Physician didn't treat the patient I can't code
for that diagnosis