<title>Abstract</title> Background Nurse managers should plan using scientific methods to ensure that nurse human resources work efficiently and effectively. One of these methods is the patient classification system and patient acuity tools, which reflect the bio-psycho-social and spiritual care needs of patients and are used to determine the number of nursing staff required. This Delphi study was conducted to examine the scope and validity of the Perroca Patient Classification Instrument Turkish Form-Expanded in a multi-hospital sample. Methods Qualitative research design was used. This content validation study was conducted in two phases. In the first stage of preliminary preparation for the Delphi study, focus group interviews were conducted (nine focus group interviews, n: 32), and in the second stage, Delphi I (n: 43) and Delphi II (n: 37) rounds were conducted. Guidance on Conducting and Reporting Delphi Studies was used to report the research process. Results The instrument consisted of 9 domains of care and 36 items. More than 95% consensus was achieved among the experts for all items. Conclusion The instrument is a validated tool used for classifying patients in inpatient wards of hospitals. It is recommended that psychometric analyses also be performed for this tool to be used in clinical practice and research.