D81.2
Severe combined immunodeficiency [SCID] with low or normal B-cell numbers
Clinical Classification Guidelines
Medical Intelligence & Overview
Severe combined immunodeficiency (SCID) is a rare but serious genetic disorder characterized by the profoundly weakened immune system. When SCID is classified under ICD-10 code D81.2, it specifically refers to cases where patients have a severe deficiency in immune function, yet maintain low or normal levels of B-cells, which are a critical component of the immune response. This condition leaves affected individuals highly vulnerable to infections and requires careful medical management. Early diagnosis and treatment are essential for improving outcomes.
Causes & Symptoms
Clinical Causes: Genetic mutations affecting lymphocyte development, such as mutations in the IL2RG gene, which impair T-cell and natural killer (NK) cell development but often leave B-cell numbers normal. Inherited disorders passed down through families that disrupt immune cell formation and function. Certain mutations associated with X-linked SCID, which predominantly affect males, given the pattern of inheritance. Autosomal recessive mutations impacting genes necessary for lymphocyte development, possibly resulting in similar immune deficiencies.
Key Symptoms: Frequent and severe infections, including bacterial, viral, and fungal infections. Persistent diarrhea and failure to thrive in infants. Skin infections such as abscesses or dermatitis. Enlargement of lymph nodes, liver, or spleen in some cases. Possible signs of respiratory distress due to recurrent lung infections. Recurrent eye and ear infections. In some cases, developmental delays related to ongoing infections or complications.
Diagnostic & Treatment
Diagnosis Path: Diagnosing SCID involves a combination of clinical evaluation and laboratory tests. Newborn screening programs often test for T-cell receptor excision circles (TRECs), which can indicate a deficiency in T-cell production. Additional diagnostic methods include:
Treatment Protocols: Managing SCID with normal or low B-cell counts requires prompt and often aggressive intervention. Treatment options include:
Clinical Advice & FAQs
Billing Guidance
Is D81.2 a billable ICD-10 code?
Yes, D81.2 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report D81.2?
Clinical documentation must specify the nature of Severe combined immunodeficiency [SCID] with low or normal B-cell numbers and any associated comorbidities for accurate reporting.
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