Purpose. To investigate the alignment of START with NANDA-I in forensic psychiatric care. Design. A quantitative design was chosen to compare the START instrument with the NANDA-I taxonomy and analyze their alignment. Each item of the START was attempted to be matched with potentially relevant NANDA-I diagnoses, and the matched diagnoses were extracted and presented. Findings. The study demonstrated a strong alignment between START coding and NANDA-I diagnoses, with 99% of the START diagnoses finding a match within NANDA-I. These results support the use of NANDA-I in forensic psychiatric care, which facilitate providing comprehensive care and avoiding sole focus on psychiatric problems. Practice Implications. It is recommended to use a structured nursing taxonomy, such as NANDA-I, in forensic psychiatric care.