These pages drive the services so their importance cannot be overstated. You provided the service and described under Objective Met what constituted success. So quantify that success as best you can. Under Objective Met you simply state something like, client received all necessary assessments, and under Individual Outcome you will state how those assessments contributed to the plan of care development or service delivery. This is also a single unit service, which can only be billed once in a plan year.
Duration is plan period and Frequency is how many times an assessment was performed.
Do not write up to because you are asking for a specified number of days that you will provide the service. It is understood that you probably will not provide service on all of those days due to the client being ill, absent or uncooperative. You plan for the year the best you can. But you cannot bill for more days than are approved on the plan. This can become difficult to manage when a client changes providers for any of these services during the plan year.