Severe combined immunodef w low or normal B-cell numbers

This code represents a severe, life-threatening primary immunodeficiency characterized by profound defects in both T-cell and B-cell immunity, leading to extreme susceptibility to infections. Specifically, it identifies cases where the B-cell count is low or within the normal range, distinguishing it from other SCID types. Without treatment, infants with SCID typically succumb to opportunistic infections within the first year of life.

Use this code for patients diagnosed with severe combined immunodeficiency where laboratory testing confirms low or normal B-lymphocyte numbers. This diagnosis is typically made in infancy based on clinical presentation (e.g., recurrent severe infections, failure to thrive) and confirmed by immunological studies, including flow cytometry showing absent or severely reduced T-cells and low or normal B-cells.

• Ensure documentation clearly specifies "low or normal B-cell numbers" to differentiate from other SCID types.
• Do not confuse with SCID with absent B-cells (D81.0) or adenosine deaminase deficiency (D81.30).
• Consider sequencing this code as the primary diagnosis when it is the reason for the encounter, especially for diagnostic workups or treatment initiation.