Performance of the Functional Comorbidity Index (FCI) in Prognostic Models for Risk Adjustment in Patients With Back Pain.
Sean D RundellLinda J ResnikPatrick J HeagertyAmit KumarJeffrey G JarvikPublished in: PM & R : the journal of injury, function, and rehabilitation (2020)
An ICD-9-CM version of the FCI is associated with long-term function, health-related quality of life, and total health care use among older adults with back pain; however, it explains only a small proportion of the variance.