inpt chemo treatment

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I'm newer to coding oncology, I was trained briefly before the last person covering the division left. If a patient is admitted to the hospital for chemo treatment and they did the treatment and the doctor noted that they completed their course of chemo treatment on a certain date...the primary diagnosis for those days of chemo treatment are Z51.11...NOW the patient stays in the hospital for monitoring and count recovery for several days after do I still code the Z51.11 as primary diagnosis for all those days even though she is no longer having chemo treatment but it's related to that OR do I now just code for the cancer as primary and any additional diagnosis?