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Evaluation of International Classification of Diseases, Ninth Revision, Clinical Modification Codes for Reporting Methicillin-Resistant Staphylococcus aureus Infections at a Hospital in Illinois

Published online by Cambridge University Press:  02 January 2015

Melissa K. Schaefer ,
Katherine Ellingson ,
Craig Conover ,
Alicia E. Genisca ,
Donna Currie ,
Tina Esposito ,
Laura Panttila ,
Peter Ruestow ,
Karen Martin  and
Diane Cronin
...Show all authors
Melissa K. Schaefer*
Affiliation:
Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia
Katherine Ellingson
Affiliation:
Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia
Craig Conover
Affiliation:
Illinois Department of Public Health, Springfield, Illinois
Alicia E. Genisca
Affiliation:
Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
Donna Currie
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Tina Esposito
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Laura Panttila
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Peter Ruestow
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Karen Martin
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Diane Cronin
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Michael Costello
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Stephen Sokalski
Affiliation:
Advocate Health Care, Oakbrook, Illinois
Scott Fridkin
Affiliation:
Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
Arjun Srinivasan
Affiliation:
Division of Healthcare Quality Promotion, Centers for Disease Control and Prevention, Atlanta, Georgia
*
1600 Clifton Road NE, Mailstop A-31, Atlanta, GA 30333, (mschaefer@cdc.gov)
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Abstract

Background.

States, including Illinois, have passed legislation mandating the use of International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) codes for reporting healthcare-associated infections, such as methicillin-resistant Staphylococcus aureus (MRSA).

Objective.

To evaluate the sensitivity of ICD-9-CM code combinations for detection of MRSA infection and to understand implications for reporting.

Methods.

We reviewed discharge and microbiology databases from July through August of 2005, 2006, and 2007 for ICD-9-CM codes or microbiology results suggesting MRSA infection at a tertiary care hospital near Chicago, Illinois. Medical records were reviewed to confirm MRSA infection. Time from admission to first positive MRSA culture result was evaluated to identify hospital-onset MRSA (HO-MRSA) infections. The sensitivity of MRSA code combinations for detecting confirmed MRSA infections was calculated using all codes present in the discharge record (up to 15); the effect of reviewing only 9 diagnosis codes, the number reported to the Centers for Medicare and Medicaid Services, was also evaluated. The sensitivity of the combination of diagnosis codes for detection of HO-MRSA infections was compared with that for community-onset MRSA (CO-MRSA) infections.

Results.

We identified 571 potential MRSA infections with the use of screening criteria; 403 (71%) were confirmed MRSA infections, of which 61 (15%) were classified as HO-MRSA. The sensitivity of MRSA code combinations was 59% for all confirmed MRSA infections when 15 diagnoses were reviewed compared with 31% if only 9 diagnoses were reviewed (P < .001). The sensitivity of code combinations was 33% for HO-MRSA infections compared with 62% for CO-MRSA infections (P < .001).

Conclusions.

Limiting analysis to 9 diagnosis codes resulted in low sensitivity. Furthermore, code combinations were better at revealing CO-MRSA infections than HO-MRSA infections. These limitations could compromise the validity of ICD-9-CM codes for interfacility comparisons and for reporting of healthcare-associated MRSA infections.

Type
Original Articles
Information
Infection Control & Hospital Epidemiology , Volume 31 , Issue 5 , May 2010 , pp. 463 - 468
Copyright
Copyright © The Society for Healthcare Epidemiology of America 2010

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