ICD Code D89.9

ICD code D89.9 is a diagnosis for a disorder involving the immune mechanism that is not specified or classified elsewhere.

1. Presence of clinical signs or symptoms suggestive of an immune system disorder

2. Laboratory or diagnostic evidence indicating abnormal immune function

3. Absence of a more specific diagnosis after thorough evaluation

4. Exclusion of infectious, neoplastic, or other systemic causes for the immune dysfunction

5. Documentation of immune-related manifestations such as recurrent infections, unexplained inflammation, or immune-mediated tissue damage

6. Inconclusive or non-specific findings that do not meet criteria for a defined immunodeficiency or autoimmune disorder

Relevant CPT codes that may be used to treat ICD code D89.9 include:

- 86001 (Allergen specific IgG quantitative or semiquantitative)

- 86003 (Allergen specific IgE; quantitative or semiquantitative, each allergen)

- 86355 (B cell, total count)

- 86357 (Natural killer (NK) cells, total count)

- 86359 (T cells, total count)

- 86360 (T cells, helper/suppressor ratio)

- 86361 (CD4/CD8 ratio)

- 36415 (Collection of venous blood by venipuncture)

- 96365 (Intravenous infusion, for therapy, prophylaxis, or diagnosis; initial, up to 1 hour)

- 96372 (Therapeutic, prophylactic, or diagnostic injection; subcutaneous or intramuscular)

- 99202–99215 (Evaluation and management services, new and established patients)

The selection of CPT codes should be based on the specific services rendered and the patient’s clinical presentation.

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