Quarterly MDS

I'm an RHIT CCS-P in Medical Records in a LTC facility. I have been asked to review the ICD 9 codes in section I3. For a quarterly MDS in section I3 lets say the resident has Alzh Dementia along with other conditions. Wouldn't it be better to enter the ICD 9 code in section I3 for the Alzh Dementia on the quarterly instead of other conditions like PVD? I'm not a nurse but I would assume that the residents Alzh Dementia would require more care planning and ADL assistance than the PVD.