Proteus (mirabilis) (morganii) infection in conditions classified elsewhere and of unspecified site

This code indicates an infection caused by Proteus species, specifically Proteus mirabilis or Proteus morganii, when the infection site is not specified and it occurs in the context of another primary condition. It signifies a secondary or co-occurring Proteus infection rather than a standalone, primary infection of a defined site.

Use this code when documentation confirms a Proteus infection (either mirabilis or morganii) but the specific anatomical site of the infection is not clearly identified. This is often seen when Proteus is isolated from cultures (e.g., blood, urine) in a patient with a complex medical history or multiple comorbidities, and the infection is considered secondary to another underlying condition.

• Always attempt to identify the specific site of the Proteus infection (e.g., urinary tract, wound) before resorting to this unspecified code.
• This code requires an additional code to identify the underlying condition or primary diagnosis for which the Proteus infection is classified elsewhere.
• Avoid using this code if a more specific ICD-9-CM code for a Proteus infection of a defined site is available and supported by documentation.