DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A39 Meningococcal infection

  • Header · not billable

A39 is not billable. The category heads 15 billable codes in FY2027, grouped under 8 subdivisions.

Index → code

  • Meningococcemia → A39.4
  • Meningococcus, meningococcal → A39.9
  • Friderichsen-Waterhouse syndrome or disease → A39.1

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A30-A49 Other bacterial diseases (A30-A49)
  3. A39 Meningococcal infection
Billable codes
15
Subdivisions
8
CC / MCC codes
5 / 10
HCC V28 codes
5
New FY2027
0
Index entries
67

Codes in A39

  1. A39.0
    Meningococcal meningitis
    BillableMCC
  2. A39.1
    Waterhouse-Friderichsen syndrome
    BillableMCC
    Inclusion terms 2

    Inclusion terms

    • Meningococcal hemorrhagic adrenalitis
    • Meningococcic adrenal syndrome
  3. A39.2
    Acute meningococcemia
    BillableMCC2
  4. A39.3
    Chronic meningococcemia
    BillableMCC2
  5. A39.4
    Meningococcemia, unspecified
    BillableMCC2
  6. A39.5
    Meningococcal heart disease
    Header
  7. A39.50
    Meningococcal carditis, unspecified
    BillableMCC
  8. A39.51
    Meningococcal endocarditis
    BillableMCC
  9. A39.52
    Meningococcal myocarditis
    BillableMCC
  10. A39.53
    Meningococcal pericarditis
    BillableMCC
  11. A39.8
    Other meningococcal infections
    Header
  12. A39.81
    Meningococcal encephalitis
    BillableMCC
  13. A39.82
    Meningococcal retrobulbar neuritis
    BillableCC
  14. A39.83
    Meningococcal arthritis
    BillableCC92
  15. A39.84
    Postmeningococcal arthritis
    BillableCC92
  16. A39.89
    Other meningococcal infections
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Meningococcal conjunctivitis
  17. A39.9
    Meningococcal infection, unspecified
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Meningococcal disease 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

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

Index entries

  • Friderichsen-Waterhouse syndrome or disease → A39.1
  • Waterhouse (-Friderichsen) syndrome or disease (meningococcal) → A39.1
  • Meningococcemia → A39.4
  • Meningococcus, meningococcal → A39.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)cerebrospinal meningococcal → A39.0
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)petechial → A39.0
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)cerebrospinal → A39.0
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)diplococcal (gram positive) → A39.0
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)epidemic NEC → A39.0
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)meningococcal → A39.0
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)Neisseria → A39.0
  • Meningococcus, meningococcalmeningitis (cerebrospinal) → A39.0
  • Adrenalitis, adrenitismeningococcal, hemorrhagic → A39.1
  • Apoplexia, apoplexy, apoplecticadrenal → A39.1
  • Disease, diseasedWaterhouse-Friderichsen → A39.1
  • Meningococcus, meningococcaladrenalitis, hemorrhagic → A39.1
  • Sepsis (generalized) (unspecified organism)adrenal hemorrhage syndrome (meningococcal) → A39.1
  • SyndromeFriderichsen-Waterhouse → A39.1
  • Syndromesepticemic adrenal hemorrhage → A39.1
  • SyndromeWaterhouse (-Friderichsen) → A39.1
  • Meningococcemiaacute → A39.2
  • Meningococcemiachronic → A39.3
  • Sepsis (generalized) (unspecified organism)meningococcal → A39.4
  • Carditis (acute) (bacterial) (chronic) (subacute)meningococcal → A39.50
  • Endocarditis (chronic) (marantic) (nonbacterial) (thrombotic) (valvular)meningococcal → A39.51
  • Myocarditis (with arteriosclerosis)(chronic)(fibroid) (interstitial) (old) (progressive) (senile)meningococcal → A39.52
  • Pericarditis (with decompensation) (with effusion)meningococcal → A39.53
  • Encephalitis (chronic) (hemorrhagic) (idiopathic) (nonepidemic) (spurious) (subacute)meningococcal → A39.81
  • Meningoencephalitisepidemic → A39.81
  • Meningomyelitismeningococcal → A39.81
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)meningococcal → A39.83
  • Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute)postmeningococcal → A39.84
  • Conjunctivitis (staphylococcal) (streptococcal) NOSmeningococcal → A39.89
  • Infection, infected, infective (opportunistic)meningococcal → A39.9
  • Infection, infected, infective (opportunistic)parameningococcus NOS → A39.9
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)spottedcerebrospinal meningitis → A39.0
  • Infection, infected, infective (opportunistic)meningococcalcerebrospinal → A39.0
  • Infection, infected, infective (opportunistic)meningococcalmeninges → A39.0
  • Inflammation, inflamed, inflammatory (with exudation)cerebrospinalmeningococcal → A39.0
  • Infection, infected, infective (opportunistic)meningococcaladrenals → A39.1

27 more, longer entries are not listed; the search box finds them by word.

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

Hierarchy