DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

A37 Whooping cough

  • Header · not billable

A37 is not billable. The category heads 8 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

Where it sits

  1. Chapter 1 Certain infectious and parasitic diseases (A00-B99)
  2. A30-A49 Other bacterial diseases (A30-A49)
  3. A37 Whooping cough
Billable codes
8
Subdivisions
4
CC / MCC codes
4 / 4
HCC V28 codes
0
New FY2027
0
Index entries
24

Codes in A37

  1. A37.0
    Whooping cough due to Bordetella pertussis
    Header
  2. A37.00
    Whooping cough due to Bordetella pertussis without pneumonia
    BillableCC
    Inclusion terms 1

    Inclusion terms

    • Paroxysmal cough due to Bordetella pertussis without pneumonia
  3. A37.01
    Whooping cough due to Bordetella pertussis with pneumonia
    BillableMCC
    Inclusion terms 1

    Inclusion terms

    • Paroxysmal cough due to Bordetella pertussis with pneumonia
  4. A37.1
    Whooping cough due to Bordetella parapertussis
    Header
  5. A37.10
    Whooping cough due to Bordetella parapertussis without pneumonia
    BillableCC
  6. A37.11
    Whooping cough due to Bordetella parapertussis with pneumonia
    BillableMCC
  7. A37.8
    Whooping cough due to other Bordetella species
    Header
  8. A37.80
    Whooping cough due to other Bordetella species without pneumonia
    BillableCC
  9. A37.81
    Whooping cough due to other Bordetella species with pneumonia
    BillableMCC
  10. A37.9
    Whooping cough, unspecified species
    Header
  11. A37.90
    Whooping cough, unspecified species without pneumonia
    BillableCC
  12. A37.91
    Whooping cough, unspecified species with pneumonia
    BillableMCC

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

  • Pertussis → A37.90
  • Whooping cough → A37.90
  • Cough (affected) (epidemic) (nervous)paroxysmal, due to Bordetella pertussis (without pneumonia) → A37.00
  • Whooping coughwith pneumonia → A37.91
  • Cough (affected) (epidemic) (nervous)paroxysmal, due to Bordetella pertussis (without pneumonia)with pneumonia → A37.01
  • Tracheobronchitis (15 years of age and above)due toBordetella bronchiseptica → A37.80
  • Whooping coughwith pneumoniaspecified organism NEC → A37.81
  • Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)in (due to)whooping cough → A37.90
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)in (due to)whooping cough → A37.91
  • Whooping coughdue toBordetellapertussis → A37.00
  • Whooping coughwith pneumoniadue to Bordetellapertussis → A37.01
  • Whooping coughdue toBordetellaparapertussis → A37.10
  • Whooping coughwith pneumoniadue to Bordetellaparapertussis → A37.11
  • Whooping coughdue toBordetellabronchiseptica → A37.80
  • Whooping coughdue toBordetellaspecified NEC → A37.80
  • Tracheobronchitis (15 years of age and above)due toBordetella bronchisepticawith pneumonia → A37.81
  • Whooping coughwith pneumoniadue to Bordetellabronchiseptica → A37.81
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)in (due to)whooping coughdue toBordetella pertussis → A37.01
  • Whooping coughdue toBordetellapertussiswith pneumonia → A37.01
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)in (due to)whooping coughdue toBordetella parapertussis → A37.11
  • Whooping coughdue toBordetellaparapertussiswith pneumonia → A37.11
  • Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved)in (due to)whooping coughdue tospecified NEC → A37.81
  • Whooping coughdue toBordetellabronchisepticawith pneumonia → A37.81
  • Whooping coughdue toBordetellaspecified NECwith pneumonia → A37.81

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

Hierarchy