ICD-10-CM > L00-L99 > L00-L08 > L03 > L03.3 > L03.31 L03.31 Cellulitis of trunk Non-Billable/Non-Specific Type 2 Excludes cellulitis of anal and rectal regions (K61.-)cellulitis of breast NOS (N61.0)cellulitis of female external genital organs (N76.4)cellulitis of male external genital organs (N48.2, N49.-)omphalitis of newborn (P38.-)puerperal cellulitis of breast (O91.2) Codes L03.311Cellulitis of abdominal wallL03.312Cellulitis of back [any part except buttock]L03.313Cellulitis of chest wallL03.314Cellulitis of groinL03.315Cellulitis of perineumL03.316Cellulitis of umbilicusL03.317Cellulitis of buttockL03.319Cellulitis of trunk, unspecifiedL03.31ACellulitis of flank