Blister of hip, thigh, leg, and ankle, infected

This code signifies an infected blister located on the hip, thigh, leg, or ankle. It indicates a localized collection of fluid under the skin, complicated by a bacterial or other microbial infection. The infection may present with erythema, warmth, pain, or purulent discharge.

Use this code when documentation clearly specifies an infected blister on the lower extremity, excluding the foot. This typically applies to cases where a blister has become secondarily infected, often due to scratching or poor hygiene. Supporting documentation should detail the presence of a blister and signs/symptoms of infection.

• Differentiate from non-infected blisters; if no infection is present, a different code from the 916 series (e.g., 916.0-916.2) would be appropriate.
• Be sure to specify the exact anatomical location if more precise codes are available within the ICD-9-CM framework for other blister types.
• Consider an additional code for the underlying cause of the blister (e.g., friction, burn) if known and documented.