This is not possible with SMRFs because they only contain data about services used after an individual enrolls. This is also not possible with SMRFs because they only contain data about services used while an individual is enrolled. SMRFs contain final action claims, which are claims for which all adjustments and errors have been resolved, whereas most states do not provide files with final action claims. SMRFs also require far less data cleaning than Medicaid files obtained from individual states because SMRFs have been edited extensively. Another difference is that SMRF file formats are identical for each state, which facilitates interstate analysis.
Files provided by individual states often have varying file formats.
Longitudinal analysis is possible for states with more than 1 year of SMRFs available, but keep in mind that eligibility rules and program benefits change frequently. Not at this time. HCFA is working on an initiative that will eventually allow researchers to link Medicare and Medicaid claims. No, SMRFs only contain data for claims that were paid for by Medicaid. None for some claims, very little for others.