Severe Maternal Morbidity and Postpartum Care: An Investigation Among a Privately Insured Population in the United States, 2008-2019.

Objective: This study examines postpartum health care utilization among women with severe maternal morbidity (SMM) subtypes (e.g., blood transfusion, renal), focusing on both early (within 7 days) and late (8-42 days) postpartum periods. By including outpatient visits alongside inpatient and emergency department (ED) visits, the study offers a comprehensive view of postpartum health care needs among women with SMM. Methods: This retrospective cohort study used data from Optum's de-identified Clinformatics® Data Mart Database from 2008 to 2019. The primary outcomes were early and late postpartum inpatient readmissions, early and late ED visits, and outpatient care within 42 days after delivery. Multilevel logistic regression models were used to estimate the association between SMM subtypes and postpartum readmission, ED, and outpatient care. Results: Except for hemorrhage, most SMM subtypes increased the postpartum odds of health care utilization. Women with other medical SMM (e.g., puerperal cerebrovascular disorders or sickle cell disease with crisis) had 2.9 times the odds (odds ratio [OR]: 2.87, 95% confidence interval [CI]: 1.30-6.34) of experiencing early readmissions compared with those without other medical SMM. Women with sepsis had 4.5-fold elevated odds (OR: 4.53, 95% CI: 2.48-8.28) of late readmission, a 1.9-fold increased odds (OR: 1.85, 95% CI: 1.12-3.04) of early ED visits, and over a 2-fold increased odds (OR: 2.27, 95% CI: 1.67-3.08) of postpartum outpatient visits compared with those without sepsis. Conclusion: This study reveals that certain SMM subtypes significantly increase postpartum health care utilization, emphasizing the need for further research and interventions to improve outcomes for affected women.