ECR files have a standard naming convention of eight characters and a three character extension.
Two letters that represent the type of facility (ex. HH = HHA, SN = SNF, HS = Hospice, …)
The six digits of the provider number
Two digit extension for the calendar year of the cost report period end
The letter ‘A’ if this is the first Cost Report or the letter ‘B’ if it’s the second during this calendar year