Incidence of skin and soft tissue infections in ambulatory and inpatient settings, 2005–2010

BMC Infectious Diseases

Table 1 Skin and soft tissue infections (SSTI) by clinical condition, severity, and ICD-9 code

Description	ICD-9 codes
Uncomplicated SSTI
Carbuncle and furuncle	680.x
Cellulitis and abscess^a	681.x-682.x
Erysipelas^a	035.x
Impetigo	684.x
Mastitis	611.0x, 771.5x
Folliculitis^a	704.8x
Complicated SSTI
“Other” skin and subcutaneous tissue infections	686.x
Decubitis Ulcer^b	707.x
Infection due to device or graft	996.6x
Surgical site infection	998.5x, 999.3x
Non-healing surgical wound^b	998.83
Any SSTI diagnosis in a patient with any of the following comorbidities:
Diabetes	250.xx
Chronic kidney disease	585.xx, 403.xx
Chronic liver disease	571.xx, 572.xx
Peripheral artery disease	440.xx, 443.9
Neuropathy	356.xx, 357.xx, 250.6x
Obesity	278.0x, 278.00, 278.01, 278.02, V85.21, V85.22, V85.23, V85.24, V85.25, V85.4, V85.3x
Alcohol or drug abuse	303.xx, 304.xx, 305.xx
Compromised immune function	279.0x, 279.1x, 279.2x, 279.3x, 334.8x

^aCellulitis, erysipelas, and folliculitis were considered complicated if the index diagnosis of the primary diagnosis was on an inpatient claim
^bDecubitis ulcer and non-healing surgical wound were considered an active infection if: either a) clinical diagnosis was associated with concomitant prescription of any of the following of antibiotics: dicloxacillin, vancomycin, cefalexin, cefazolin, linezolid, daptomycin, clindamycin, trimethoprim-sulfamethoxazole, doxycycline, minocycline, quniupristin-dalfopristin within ± 10 days of the index diagnosis; or b) if no other concomitant clinical diagnosed infection occurred
Uncomplicated and complicated categories adapted from: Stevens DL et al. [15]

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