DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 1

A90-A99 Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)

Block A90-A99 groups 9 categories with 34 billable codes in FY2027.

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A90-A99 Arthropod-borne viral fevers and viral hemorrhagic fevers (A90-A99)

Neighbouring blocks

Categories
9
Billable codes
34
CC codes
27
MCC codes
4
HCC V28 codes
0
New FY2027
0

Categories in A90-A99

  • A90

    Dengue fever [classical dengue]

    Dengue (classical) (fever) → A90

    • Billable, no subdivisions
    • 1 CC
  • A91

    Dengue hemorrhagic fever

    Bangkok hemorrhagic fever → A91

    • Billable, no subdivisions
    • 1 CC
  • A92

    Other mosquito-borne viral fevers

    Zika NOS → A92.5

    • 11 billable codes
    • 7 CC
    • 4 MCC
  • A93

    Other arthropod-borne viral fevers, not elsewhere classified

    Chitral fever → A93.1

    • 4 billable codes
    • 4 CC
  • A94

    Unspecified arthropod-borne viral fever

    Disease, diseasedarthropod-borne NOS (viral) → A94

    • Billable, no subdivisions
    • 1 CC
  • A95

    Yellow fever

    Urban yellow fever → A95.1

    • 3 billable codes
    • 3 CC
  • A96

    Arenaviral hemorrhagic fever

    Lassa fever → A96.2

    • 5 billable codes
    • 4 CC
  • A98

    Other viral hemorrhagic fevers, not elsewhere classified

    Ebola virus disease → A98.4

    • 7 billable codes
    • 5 CC
  • A99

    Unspecified viral hemorrhagic fever

    Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hemorrhagic (arthropod-borne) NOSviral → A99

    • Billable, no subdivisions
    • 1 CC

Index main terms

  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) → A90, A91, A92, A93, A94, A95, A96, A98, A99 (109 entries)
  • Disease, diseased → A92, A93, A94, A98 (16 entries)
  • Virus, viral → A92 (8 entries)
  • Infection, infected, infective (opportunistic) → A92, A93, A94 (4 entries)
  • Dengue (classical) (fever) → A90, A91, A93 (3 entries)
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute) → A92 (2 entries)
  • Encephalomyelitis → A92 (2 entries)
  • American → A93 (1 entry)
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) → A92 (1 entry)
  • Bangkok hemorrhagic fever → A91 (1 entry)
  • Bwamba fever → A92 (1 entry)
  • Changuinola fever → A93 (1 entry)
  • Chitral fever → A93 (1 entry)
  • Crimean hemorrhagic fever → A98 (1 entry)
  • Ebola virus disease → A98 (1 entry)

+26 more main terms; the search box finds them by word.

Block instructions

Notes that also apply

Chapter 1 instructions (Includes 1, Excludes2 5, Use additional code 1): printed on the chapter 1 page.