Multimorbidity and healthcare utilisation among high-cost patients in the US Veterans Affairs Health Care System.

Zulman DM, Pal Chee C, Wagner TH, Yoon J, Cohen DM, Holmes TH, Ritchie C, Asch SM. Multimorbidity and healthcare utilisation among high-cost patients in the US Veterans Affairs Health Care System. BMJ open. 2015 Apr 16; 5(4):e007771.

Related HSR&D Project(s)

• PPO 13-117 – Evaluating Innovative Care Models for High-Utilizing Patients
• CDA 12-173 – Optimizing eHealth Applications for Multimorbid Patients

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Abstract:

OBJECTIVES: To investigate the relationship between multimorbidity and healthcare utilisation patterns among the highest cost patients in a large, integrated healthcare system. DESIGN: In this retrospective cross-sectional study of all patients in the U.S. Veterans Affairs (VA) Health Care System, we aggregated costs of individuals'' outpatient and inpatient care, pharmacy services and VA-sponsored contract care received in 2010. We assessed chronic condition prevalence, multimorbidity as measured by comorbidity count, and multisystem multimorbidity (number of body systems affected by chronic conditions) among the 5% highest cost patients. Using multivariate regression, we examined the association between multimorbidity and healthcare utilisation and costs, adjusting for age, sex, race/ethnicity, marital status, homelessness and health insurance status. SETTING: USA VA Health Care System. PARTICIPANTS: 5.2 million VA patients. MEASURES: Annual total costs; absolute and share of costs generated through outpatient, inpatient, pharmacy and VA-sponsored contract care; number of visits to primary, specialty and mental healthcare; number of emergency department visits and hospitalisations. RESULTS: The 5% highest cost patients (n = 261,699) accounted for 47% of total VA costs. Approximately two-thirds of these patients had chronic conditions affecting = 3 body systems. Patients with cancer and schizophrenia were less likely to have documented comorbid conditions than other high-cost patients. Multimorbidity was generally associated with greater outpatient and inpatient utilisation. However, increased multisystem multimorbidity was associated with a higher outpatient share of total costs (1.6 percentage points per affected body system, p < 0.01) but a lower inpatient share of total costs (-0.6 percentage points per affected body system, p < 0.01). CONCLUSIONS: Multisystem multimorbidity is common among high-cost VA patients. While some patients might benefit from disease-specific programmes, for most patients with multimorbidity there is a need for interventions that coordinate and maximise efficiency of outpatient services across multiple conditions.