To identify the impact of inpatient rehabilitation services on the functional levels of cancer patients. Methods: This was a retrospective study of data from the Rehabilitation Hospital, King Fahad Medical City, Riyadh, Saudi Arabia, from 2012 to 2018. The functional independence measure (FIM) tool was used to assess functional changes from admission to discharge to determine the impact of inpatient rehabilitation. Results: A total of 81 eligible records were reviewed. The median hospital length of stay (LOS) was 50 days, mean±SD of the FIM gain was 25 (15.3), and 91.4% were discharged home, while only 4.9% were readmitted. Although statistically significant gains were observed in both motor and cognitive scores, motor scores Original Article improved more than the cognitive. The LOS was less (30 days) in patients requiring minimal assistance, at the time of admission, compared to the LOS in patients with moderate and low levels of independence. The level of significance was set at p≤0.05 Conclusions: In patient cancer rehabilitation service demonstrated statistically significant functional gains during rehabilitation at King Fahad Medical City. This study may help the policymakers to provide similar rehabilitation services to all cancer patients as well as in other health care hospitals to improve the functional status of cancer survivors.