Objectives: The objective of this study was to estimate the efficiency of rehabilitative interventions among patients treated at Department of Physical Medicine and Rehabilitation with Rheumatology at University Hospital of Split, based on treatment outcome measures. Materials and Methods: A retrospective research study was conducted by reviewing the medical documentation of all 1024 patients treated at Department of Physical Medicine and Rehabilitation with Rheumatology between January 1st, 2021, and December 31st, 2022. Factors such as age, gender and individual diagnoses were considered from the patients' medical history. Treatment outcome measures provided upon hospitalization and hospital discharge were recorded. The presence of a descriptive assessment of the patient's condition upon discharge was also investigated. The collected data was analyzed using the McNemar test to compare measures taken at admission and discharge within the same group. Results: The results indicate a lack of pursuit of treatment outcome measures at Department of Physical Medicine and Rehabilitation with Rheumatology. Among the 1024 cases, the most common treatment outcome measure, the Barthel Index of Functional Independence, was determined upon admission and discharge in 614 cases (60%) while, it was not determined in 243 cases (24%) of patients. Statistical analysis revealed a significant difference in the determination of the Barthel Index and range of motion between admission and discharge (P<0.01). Conclusions: The study concludes that treatment outcome measures are insufficiently used and inadequately implemented at the Department of Physical Medicine and Rehabilitation with Rheumatology at University Hospital of Split. The implementation of these measures is limited to a few basic tests and measurements, and even these are not consistently implemented or are implemented incorrectly in a significant number of patients. Improvements are needed to ensure the proper utilization of treatment outcome measures, adherence to protocols, and accurate implementation in order to effectively evaluate patient progress and treatment effectiveness.