D82.9

HCC Category Mapping

What This Code Means

An immunodeficiency condition associated with a major genetic or developmental defect, but the specific defect has not been identified or documented.

Coding Tips

• •This is a default code; use only when the major defect cannot be specified
• •Attempt to obtain additional diagnostic information to assign a more specific D82 code

Clinical Significance

Immunodeficiency associated with major defect, unspecified, indicates that a patient has an immunodeficiency linked to a significant genetic or developmental abnormality, but the specific major defect has not been identified or documented. This code serves as a placeholder during diagnostic evaluation of syndromic immunodeficiencies where the underlying genetic cause remains unknown.

Documentation Requirements

• ✓Documentation should describe the immunological deficits found on testing, the suspected associated major defect or developmental abnormality, the reason why further specificity cannot be achieved, and the plan for ongoing diagnostic evaluation.
• ✓Include immunological laboratory results and any phenotypic features suggesting a syndromic diagnosis.

Commonly Confused Codes