Which coding is necessary if an organism is specified but not indexed?

When an organism is specified in the medical documentation but is not indexed in the ICD-10-CM coding system, referring to the main term is essential for proper coding. The ICD-10-CM manual provides a structure that includes main terms and subterms that help coders locate the appropriate code for various conditions, including infections caused by specific organisms.

When a coder refers to the main term associated with the condition or infection, they can correctly apply the code that relates to the specified organism, ensuring accuracy in reflecting both the diagnosis and the causative agent. This process typically involves consulting the Alphabetic Index first to find the appropriate main term related to the organism mentioned, which leads to the correct code.

Option A, which suggests coding only the organism, may neglect the full context of the clinical scenario, such as the patient's condition or any associated infections. The organism alone does not provide a complete diagnostic picture.

Option C, which implies using both infection and organism codes, may not be necessary or appropriate if the organism is not indexable and referring to the main term provides the needed coding structure.

Option D assumes the nature of the infection without enough clinical evidence, which can lead to inaccurate coding. It is crucial to adhere to the coding guidelines and the specificity