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Background: Blood or marrow transplantation (BMT) survivors carry a high burden of morbidity, yet health care utilization by this vulnerable population remains understudied. Patterns and predictors of various domains of health care utilization in long‐term BMT survivors were evaluated. Methods: Study participants were drawn from the Bone Marrow Transplant Survivor Study (BMTSS). Patients transplanted between 1974 and 2014 at one of three transplant centers who had survived ≥2 years after BMT and were aged ≥18 years at the time of the study were included. A BMTSS survey served as the source of data for health care utilization, sociodemographics, and chronic health conditions. Domains of health care utilization in the 2 years preceding study participation included routine checkups, BMT‐related visits, transplant/cancer center visits, emergency room (ER) visits, hospitalizations, and high health care utilization (≥7 physician visits during the 2 years before the study). Clinical characteristics and therapeutic exposures were abstracted from medical records. Results: In this cohort of 3342 BMT survivors (52% allogeneic), the prevalence of health care utilization declined over time since BMT for both allogeneic and autologous BMT survivors, such that among those who had survived ≥20 years, only 49%–53% had undergone routine checkups, 37%–38% reported BMT‐related visits, and 28%–29% reported transplant/cancer center visits. The presence of severe/life‐threatening conditions and chronic graft‐vs‐host disease increased the odds of health care utilization across all domains. Lower education, lack of insurance, and Hispanic ethnicity were associated with a lower prevalence of routine checkups and/or transplant/cancer center visits. Lower income increased the odds of ER visits but reduced the odds of hospitalizations or high health care utilization. Conclusions: This study identified vulnerable populations of long‐term BMT survivors who would benefit from specialized risk‐based anticipatory care to reduce high health care utilization, ER visits, and hospitalizations. Health care utilization (including routine medical checkups) declines with increasing time since blood or marrow transplantation, except among survivors with severe/life‐threatening chronic health conditions as well as those with chronic graft‐vs‐host disease. Lower education and lack of insurance are associated with lower health care utilization. [ABSTRACT FROM AUTHOR]