DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

D84 Other immunodeficiencies

  • Header · not billable

D84 is not billable. The category heads 7 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

  • Immunodeficiency → D84.9
  • Immunodeficient NOS → D84.9
  • Immunosuppressed NOS → D84.9

Where it sits

  1. Chapter 3 Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)
  2. D80-D89 Certain disorders involving the immune mechanism (D80-D89)
  3. D84 Other immunodeficiencies
Billable codes
7
Subdivisions
4
CC / MCC codes
5 / 0
HCC V28 codes
1
New FY2027
0
Index entries
28

Codes in D84

  1. D84.0
    Lymphocyte function antigen-1 [LFA-1] defect
    Billable
  2. D84.1
    Defects in the complement system
    Billable115
    Inclusion terms 1

    Inclusion terms

    • C1 esterase inhibitor [C1-INH] deficiency
  3. D84.8
    Other specified immunodeficiencies
    Header
  4. D84.81
    Immunodeficiency due to conditions classified elsewhere
    BillableCC
    Excludes1 2, Code first 4

    Excludes1

    • certain disorders involving the immune mechanism (D80-D83, D84.0, D84.1, D84.9) D80 D83 D84.0 D84.1 D84.9
    • human immunodeficiency virus [HIV] disease (B20) B20

    Code first

    • underlying condition, such as:
    • chromosomal abnormalities (Q90-Q99) Q90 Q99
    • diabetes mellitus (E08-E13) E08 E13
    • malignant neoplasms (C00-C96) C00 C96
  5. D84.82
    Immunodeficiency due to drugs and external causes
    Header
  6. D84.821
    Immunodeficiency due to drugs
    BillableCC
    Inclusion terms 1, Use additional code 4

    Inclusion terms

    • Immunodeficiency due to (current or past) medication

    Use additional code

    • code for adverse effect if applicable, to identify adverse effect of drug (T36-T50 with fifth or six character 5) T36 T50
    • code, if applicable, for associated long term (current) drug therapy drug or medication such as:
    • long term (current) drug therapy systemic steroids (Z79.52) Z79.52
    • other long term (current) drug therapy (Z79.899) Z79.899
  7. D84.822
    Immunodeficiency due to external causes
    BillableCC
    Use additional code 2, Code also 1

    Use additional code

    • code for external cause such as:
    • exposure to ionizing radiation (W88) W88

    Code also

    • , if applicable, radiological procedure and radiotherapy (Y84.2) Y84.2
  8. D84.89
    Other immunodeficiencies
    BillableCC
  9. D84.9
    Immunodeficiency, unspecified
    BillableCC
    Inclusion terms 3

    Inclusion terms

    • Immunocompromised NOS
    • Immunodeficient NOS
    • Immunosuppressed NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

Notes that also apply

Block D80-D89 instructions (Includes 3, Excludes1 2, Excludes2 1): printed on the block page.

Chapter 3 instructions (Excludes2 9): printed on the chapter 3 page.

Index entries

  • Immunocompromised NOS → D84.9
  • Immunodeficiency → D84.9
  • Immunodeficient NOS → D84.9
  • Immunosuppressed NOS → D84.9
  • Defect, defectivelymphocyte function antigen-1 (LFA-1) → D84.0
  • Angioedema (allergic) (any site) (with urticaria)hereditary → D84.1
  • Angioneurotic edema (allergic) (any site) (with urticaria)hereditary → D84.1
  • Bannister's diseasehereditary → D84.1
  • Defect, defectivecomplement system → D84.1
  • Deficiency, deficientC1 esterase inhibitor (C1-INH) → D84.1
  • Quincke's disease or edemahereditary → D84.1
  • Immunodeficiencyspecified type NEC → D84.89
  • Deficiency, deficientimmunity → D84.9
  • Edema, edematous (infectious) (pitting) (toxic)angioneurotic (allergic) (any site) (with urticaria)hereditary → D84.1
  • Edema, edematous (infectious) (pitting) (toxic)circumscribed, acutehereditary → D84.1
  • Edema, edematous (infectious) (pitting) (toxic)essential, acutehereditary → D84.1
  • Edema, edematous (infectious) (pitting) (toxic)periodichereditary → D84.1
  • Edema, edematous (infectious) (pitting) (toxic)Quincke'shereditary → D84.1
  • Gianturticariahereditary → D84.1
  • Urticariawith angioneurotic edemahereditary → D84.1
  • Urticariagianthereditary → D84.1
  • Urticarialarynxhereditary → D84.1
  • Immunodeficiencydue toconditions classified elsewhere → D84.81
  • Immunodeficiencydue todrugs → D84.821
  • Immunodeficiencydue tomedication (current or past) → D84.821
  • Immunodeficiencydue toexternal causes → D84.822
  • Deficiency, deficientimmunitycell-mediated → D84.89
  • Edema, edematous (infectious) (pitting) (toxic)glottis, glottic, glottidis (obstructive) (passive)allergichereditary → D84.1

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy