D84.9 Immunodeficiency, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Immunocompromised NOS
• Immunodeficient NOS
• Immunosuppressed NOS

Risk adjustment (HCC)

• CMS-HCC V22: HCC 47 — Disorders of Immunity
• RxHCC V08: HCC 99 — Immune Disorders
• ESRD V24: HCC 47

MS-DRG index

Defines the logic of DRG(s) 814-816 in MDC 16.

Approximate ICD-9-CM (GEMs)

• 279.3 Unspecified immunity deficiency (approximate)

Code annotations containing back-references to D84.9

Back-references to D84.9

• Type 1 Excludes: D84.81 Immunodeficiency due to conditions classified elsewhere ("certain disorders involving the immune mechanism (D80-D83, D84.0, D84.1, D84.9)")

Back-references to D84

• Type 1 Excludes: D72 Other disorders of white blood cells ("immunity disorders (D80-D89)")

Diagnosis Index entries for D84.9

• Deficiency, deficient › immunity
• Immunocompromised NOS
• Immunodeficiency
• Immunodeficient NOS
• Immunosuppressed NOS

Nearby codes

• D84.81 Immunodeficiency due to conditions classified elsewhere
• D84.82 Immunodeficiency due to drugs and external causes
• D84.821 Immunodeficiency due to drugs
• D84.822 Immunodeficiency due to external causes
• D84.89 Other immunodeficiencies
• D84.9 Immunodeficiency, unspecified (this code)