Mortality, healthcare resource utilization, and cost among Medicare beneficiaries with infection with and without sepsis.

OBJECTIVE

To describe mortality, healthcare resource utilization (HRU), and costs among Medicare beneficiaries with primary infection (pCDI) or recurrent CDI (rCDI), with and without sepsis.

METHODS

We conducted a retrospective observational study of 100% Medicare Fee-for-Service claims from adults aged ⩾ 65 years with ⩾1 CDI episode between 1 January 2009 and 31 December 2017. Patients were continuously enrolled in Medicare Parts A/B/D 12 months before and up to 12 months after pCDI. ICD-9/10 codes defined CDI using ⩾1 inpatient claim, or ⩾1 outpatient claim plus ⩾1 claim for CDI treatment. The pCDI episode ended after 14 days without a CDI claim. rCDI episodes started within 8 weeks from the end of a previous CDI episode. ICD-9/10 codes identified all-cause sepsis over 12 month follow-up.

RESULTS

Of 497,489 CDI patients, 41.0% ( = 203,888) had sepsis; 57.7% with sepsis died 32.4% without sepsis. Among patients with pCDI only ( = 345,893) or ⩾1 rCDI ( = 151,596), 39.2% and 45.1% suffered sepsis, respectively. All-cause hospitalizations were frequent for all cohorts (range: 81-99%). Among patients who died, those with sepsis without had more-frequent intensive care unit (ICU) use (pCDI: 29% 15%; rCDI: 65% 34%), longer hospital stays (pCDI: 12 10 days; rCDI: 12 9 days), and higher per-patient-per-month costs (pCDI: $34,841 $22,753; rCDI: $42,269 $25,047). In both cohorts, sepsis patients who survived had higher total costs and all-cause HRU than those without sepsis. All  < 0.001 above.

CONCLUSIONS

Sepsis was common among Medicare beneficiaries with CDI. CDI patients with sepsis, especially after an rCDI, experienced higher mortality, HRU, and costs compared with those without sepsis.