Epidemiology and outcomes of community-acquired Clostridium difficile infections in Medicare beneficiaries

UMMS Affiliation

Center for Outcomes Research Surgical Research Scholars Program; Department of Surgery

Publication Date


Document Type



Aged; Aged, 80 and over; Clostridium Infections; *Clostridium difficile; Community-Acquired Infections; Female; Humans; Male; *Medicare; Treatment Outcome; United States


Bacterial Infections and Mycoses | Clinical Epidemiology | Community Health and Preventive Medicine | Geriatrics | Therapeutics | Translational Medical Research


BACKGROUND: The incidence of community-acquired Clostridium difficile (CACD) is increasing in the United States. Many CACD infections occur in the elderly, who are predisposed to poor outcomes. We aimed to describe the epidemiology and outcomes of CACD in a nationally representative sample of Medicare beneficiaries.

STUDY DESIGN: We queried a 5% random sample of Medicare beneficiaries (2009-2011 Part A inpatient and Part D prescription drug claims; n = 864,604) for any hospital admission with a primary ICD-9 diagnosis code for C difficile (008.45). We examined patient sociodemographic and clinical characteristics, preadmission exposure to oral antibiotics, earlier treatment with oral vancomycin or metronidazole, inpatient outcomes (eg, colectomy, ICU stay, length of stay, mortality), and subsequent admissions for C difficile.

RESULTS: A total of 1,566 (0.18%) patients were admitted with CACD. Of these, 889 (56.8%) received oral antibiotics within 90 days of admission. Few were being treated with oral metronidazole (n = 123 [7.8%]) or vancomycin (n = 13 [0.8%]) at the time of admission. Although 223 (14%) patients required ICU admission, few (n = 15 [1%]) underwent colectomy. Hospital mortality was 9%. Median length of stay among survivors was 5 days (interquartile range 3 to 8 days). One fifth of survivors were readmitted with C difficile, with a median follow-up time of 393 days (interquartile range 129 to 769 days).

CONCLUSIONS: Nearly half of the Medicare beneficiaries admitted with CACD have no recent antibiotic exposure. High mortality and readmission rates suggest that the burden of C difficile on patients and the health care system will increase as the US population ages. Additional efforts at primary prevention and eradication might be warranted.


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DOI of Published Version



J Am Coll Surg. 2014 Jun;218(6):1141-1147.e1. doi: 10.1016/j.jamcollsurg.2014.01.053. Epub 2014 Feb 28. Link to article on publisher's site.

Journal/Book/Conference Title

Journal of the American College of Surgeons

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