Purpose The purpose of this study is to test the Nursing–Kids Intensity of Care, a measure of the intensity of nursing care needs, defined as the quantity and type of direct and indirect care activities performed by caregivers in a national sample. Design and Methods A 40-item tool previously tested in a small sample was psychometrically tested on a sample of 116 children with complex medical conditions by 33 nurse raters across 11 pediatric sites. Results The Nursing–Kids Intensity of Care tool demonstrated components of usability, feasibility, inter-rater, test-retest and internal consistency reliability and construct validity in the national study sample. Conclusions Additional testing to further establish psychometric sufficiency and expanded use to quantify the intensity of nursing care needs of children with complex medical conditions in pediatric long-term care settings is recommended. Practice Implications This novel measure could assist the nursing administrators, educators and staff of pediatric long-term care facilities assess the intensity of care needs of their residents.