DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A85 Other viral encephalitis, not elsewhere classified

  • Header · not billable

A85 is not billable. The category heads 4 billable codes in FY2027: the 4 codes directly below it.

Index → code

  • Cruchet's disease → A85.8
  • Economo's disease → A85.8
  • Von Economo-Cruchet disease → A85.8

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A80-A89 Viral and prion infections of the central nervous system (A80-A89)
  3. A85 Other viral encephalitis, not elsewhere classified
Billable codes
4
Subdivisions
4
CC / MCC codes
3 / 1
HCC V28 codes
0
New FY2027
0
Index entries
14

Codes in A85

  1. A85.0
    Enteroviral encephalitis
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Enteroviral encephalomyelitis
  2. A85.1
    Adenoviral encephalitis
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Adenoviral meningoencephalitis
  3. A85.2
    Arthropod-borne viral encephalitis, unspecified
    BillableMCC
    Excludes1 1

    Excludes1

    • West nile virus with encephalitis (A92.31) A92.31
  4. A85.8
    Other specified viral encephalitis
    BillableCC
    Inclusion terms 2

    Inclusion terms

    • Encephalitis lethargica
    • Von Economo-Cruchet disease

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

At A85

Includes

  • specified viral encephalomyelitis NEC
  • specified viral meningoencephalitis NEC

Excludes1

  • encephalitis due to cytomegalovirus (B25.8) B25.8
  • encephalitis due to herpesvirus NEC (B10.0-) B10.0
  • encephalitis due to herpesvirus [herpes simplex] (B00.4) B00.4
  • encephalitis due to measles virus (B05.0) B05.0
  • encephalitis due to mumps virus (B26.2) B26.2
  • encephalitis due to poliomyelitis virus (A80.-) A80
  • encephalitis due to zoster (B02.0) B02.0
  • lymphocytic choriomeningitis (A87.2) A87.2
  • myalgic encephalomyelitis (G93.32) G93.32

Notes that also apply

Block A80-A89 instructions (Excludes1 3): printed on the block page.

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

Index entries

  • Cruchet's disease → A85.8
  • Economo's disease → A85.8
  • Von Economo-Cruchet disease → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)arboviral, arbovirus NEC → A85.2
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)arthropod-borne NEC (viral) → A85.2
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)lethargica (acute) (infectious) → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Mengo → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Rio Bravo → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)Vienna → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)in (due to)enterovirus → A85.0
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)in (due to)adenovirus → A85.1
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)viral, virusarthropod-borne NEC → A85.2
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)acuteinclusion body → A85.8
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)viral, virusspecified type NEC → A85.8

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

Hierarchy