The Outcome and Assessment Information Set (OASIS) is mandated for use in home healthcare. The purpose of this descriptive study was to compare occupational therapy (OT) OASIS rating of functional status items compared with registered nurse (RN) and physical therapy (PT) ratings. Functional status data were collected on 80 patients: 40 patients comparing RN with OT and 40 patients comparing PT with OT. RN and PT visits were made first and the OT visit followed. There were no items with perfect agreement. The highest agreement was for feeding (76.3%) and the lowest items were for toileting hygiene and ambulation (37.5%). The largest discrepancy scores were for grooming and dressing lower body. Discipline-specific discrepancy scores were mixed. Krippendorff's α scores were almost all above the required minimum of 0.80. There are substantial differences in the functional status items that may reflect differences in the disciplinary training and approaches to patient care. These findings also raise some concerns about OASIS reliability and consistency of measurement.