My physician orders a recurring Labs of CBC, CMP, TSH on his active chemo patients to monitor their blood levels. The pt usually goes for blood work 2 days before the chemo and the physician decides the next chemo session based on the lab results. Can I use Z51.81 +Z79.899 or just Z79.899 along with malignancy code on the lab orders? We are getting a lot of 84443, TSH denials? Not all the pts are diagnosed with Hypo or hyper thyroid. Thank you!