['Multimorbidity poses a significant clinical challenge and has been linked to greater health services use, including hospitalization; however, we have little knowledge about the influence of contextual factors on outcomes in this population.', 'To describe the extent to which the association between multimorbidity and hospitalization is modified by age, gender, primary care practice model, or continuity of care (COC) among adults with at least one chronic condition.', 'A retrospective cohort study with linked population-based administrative data.', 'Ontario, Canada.', 'All individuals 18 and older with at least one of 16 priority chronic conditions as of April 1, 2009 (baseline).', 'Any hospitalization, 3 or more hospitalizations, non-medical discharge delay, and 30-day readmission within the 1\xa0year following baseline.', 'Of 5,958,514 individuals, 484,872 (8.1\xa0%) experienced 646,347 hospitalizations. There was a monotonic increase in the likelihood of hospitalization and related outcomes with increasing multimorbidity which was modified by age, gender, and COC but not primary care practice model. The effect of increasing multimorbidity was greater in younger adults than older adults and in those with lower COC than with higher COC. The effect of increasing multimorbidity on hospitalization was greater in men than women but reversed for the other outcomes.'] Is the association between multimorbidity and hospitalization modified by individual demographics and physician continuity of care : a retrospective cohort study?