Blister of other, multiple, and unspecified sites, infected

This code signifies an infected blister located on a body site other than those specifically categorized, or when multiple sites are affected, or if the site is not documented. It indicates a localized collection of fluid under the skin that has become secondarily infected, presenting with signs such as erythema, warmth, pain, or purulent drainage.

Utilize this code when documentation clearly states an "infected blister" without specifying a precise anatomical location, or when multiple blisters across different body areas are infected. This code is also appropriate if the physician's notes describe an infected blister on a site not covered by more specific ICD-9-CM codes (e.g., foot, hand, face).

• Ensure the documentation explicitly states "infected" to differentiate from non-infected blisters.
• Prioritize more specific ICD-9-CM codes for infected blisters if the anatomical site is clearly identified (e.g., 913.3 for infected blister of upper limb).
• This code is a "catch-all" for infected blisters when specificity is lacking or multiple sites are involved.