Certain infectious and parasitic diseases

Covers infectious and parasitic diseases considered communicable or transmissible. A recurring theme in this chapter is combination coding: many categories already identify both the infectious organism and the site or manifestation in a single code, so an additional organism code is only needed when the category doesn't already specify it.

Key coding points

• •Use combination codes where available instead of separately coding the organism and the condition.
• •Sepsis and severe sepsis follow specific sequencing rules — sequence the underlying infection first, followed by any associated organ dysfunction codes.
• •HIV is only coded as a confirmed diagnosis when documented by the provider — 'suspected' or 'possible' HIV is not coded as confirmed.

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