DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

J45 Asthma

  • Header · not billable

J45 is not billable. The category heads 18 billable codes in FY2027, grouped under 5 subdivisions.

Index → code

  • IgE asthma → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic) → J45.909
  • Bronchospasm (acute)exercise induced → J45.990

Where it sits

  1. Chapter 10 Diseases of the respiratory system (J00-J99)
  2. J40-J4B Chronic lower respiratory diseases (J40-J4B)
  3. J45 Asthma
Billable codes
18
Subdivisions
5
CC / MCC codes
10 / 0
HCC V28 codes
3
New FY2027
0
Index entries
67

Codes in J45

  1. J45.2
    Mild intermittent asthma
    Header
  2. J45.20
    Mild intermittent asthma, uncomplicated
    Billable
    Inclusion terms 1

    Inclusion terms

    • Mild intermittent asthma NOS
  3. J45.21
    Mild intermittent asthma with (acute) exacerbation
    BillableCC
  4. J45.22
    Mild intermittent asthma with status asthmaticus
    BillableCC
  5. J45.3
    Mild persistent asthma
    Header
  6. J45.30
    Mild persistent asthma, uncomplicated
    Billable
    Inclusion terms 1

    Inclusion terms

    • Mild persistent asthma NOS
  7. J45.31
    Mild persistent asthma with (acute) exacerbation
    BillableCC
  8. J45.32
    Mild persistent asthma with status asthmaticus
    BillableCC
  9. J45.4
    Moderate persistent asthma
    Header
  10. J45.40
    Moderate persistent asthma, uncomplicated
    Billable
    Inclusion terms 1

    Inclusion terms

    • Moderate persistent asthma NOS
  11. J45.41
    Moderate persistent asthma with (acute) exacerbation
    BillableCC
  12. J45.42
    Moderate persistent asthma with status asthmaticus
    BillableCC
  13. J45.5
    Severe persistent asthma
    Header
  14. J45.50
    Severe persistent asthma, uncomplicated
    Billable279
    Inclusion terms 1

    Inclusion terms

    • Severe persistent asthma NOS
  15. J45.51
    Severe persistent asthma with (acute) exacerbation
    BillableCC279
  16. J45.52
    Severe persistent asthma with status asthmaticus
    BillableCC279
  17. J45.9
    Other and unspecified asthma
    Header
  18. J45.90
    Unspecified asthma
    Header
    Inclusion terms 3

    Inclusion terms

    • Asthmatic bronchitis NOS
    • Childhood asthma NOS
    • Late onset asthma
  19. J45.901
    Unspecified asthma with (acute) exacerbation
    BillableCC
  20. J45.902
    Unspecified asthma with status asthmaticus
    BillableCC
  21. J45.909
    Unspecified asthma, uncomplicated
    Billable
    Inclusion terms 1, Excludes2 1

    Inclusion terms

    • Asthma NOS

    Excludes2

    • lung diseases due to external agents (J60-J70) J60 J70
  22. J45.99
    Other asthma
    Header
  23. J45.990
    Exercise induced bronchospasm
    Billable
  24. J45.991
    Cough variant asthma
    Billable
  25. J45.998
    Other asthma
    Billable

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 J45

Includes

  • allergic (predominantly) asthma
  • allergic bronchitis NOS
  • allergic rhinitis with asthma
  • atopic asthma
  • extrinsic allergic asthma
  • hay fever with asthma
  • idiosyncratic asthma
  • intrinsic nonallergic asthma
  • nonallergic asthma

Excludes1

  • detergent asthma (J69.8) J69.8
  • miner's asthma (J60) J60
  • wheezing NOS (R06.2) R06.2
  • wood asthma (J67.8) J67.8

Excludes2

  • asthma with chronic obstructive pulmonary disease (J44.89) J44.89
  • chronic asthmatic (obstructive) bronchitis (J44.89) J44.89
  • chronic obstructive asthma (J44.89) J44.89
  • other specified chronic obstructive pulmonary disease (J44.89) J44.89

Use additional code

  • code to identify:
  • eosinophilic asthma (J82.83) J82.83
  • exposure to environmental tobacco smoke (Z77.22) Z77.22
  • exposure to tobacco smoke in the perinatal period (P96.81) P96.81
  • history of tobacco dependence (Z87.891) Z87.891
  • occupational exposure to environmental tobacco smoke (Z57.31) Z57.31
  • tobacco dependence (F17.-) F17
  • tobacco use (Z72.0) Z72.0

Notes that also apply

Block J40-J4B instructions (Excludes1 1, Excludes2 1): printed on the block page.

Chapter 10 instructions (Notes 1, Excludes2 9, Use additional code 7): printed on the chapter 10 page.

Index entries

  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic) → J45.909
  • IgE asthma → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)intermittent (mild) → J45.20
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild intermittent → J45.20
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild persistent → J45.30
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)moderate persistent → J45.40
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)severe persistent → J45.50
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)asthmatic → J45.9
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)allergic extrinsic → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)childhood → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)late-onset → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mixed → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)nonallergic (intrinsic) → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)predominantly allergic → J45.909
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)allergic (acute) → J45.909
  • Dyspnea (nocturnal) (paroxysmal)asthmatic (bronchial) → J45.909
  • Bronchospasm (acute)exercise induced → J45.990
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)cough variant → J45.991
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)platinum → J45.998
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)specified NEC → J45.998
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)persistentmild → J45.30
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)persistentmoderate → J45.40
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)persistentsevere → J45.50
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)withexacerbation (acute) → J45.901
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)withstatus asthmaticus → J45.902
  • Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor)hay (allergic)with asthma (bronchial) → J45.909
  • Rhinitis (atrophic) (catarrhal) (chronic) (croupous) (fibrinous) (granulomatous) (hyperplastic) (hypertrophic) (membranous) (obstructive) (purulent) (suppurative) (ulcerative)allergicwith asthma → J45.909
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)intermittent (mild)withexacerbation (acute) → J45.21
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild intermittentwithexacerbation (acute) → J45.21
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)intermittent (mild)withstatus asthmaticus → J45.22
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild intermittentwithstatus asthmaticus → J45.22
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild persistentwithexacerbation (acute) → J45.31
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)mild persistentwithstatus asthmaticus → J45.32
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)moderate persistentwithexacerbation (acute) → J45.41
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)moderate persistentwithstatus asthmaticus → J45.42
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)severe persistentwithexacerbation (acute) → J45.51
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)severe persistentwithstatus asthmaticus → J45.52
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)allergic extrinsicwithexacerbation (acute) → J45.901
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)childhoodwithexacerbation (acute) → J45.901
  • Asthma, asthmatic (bronchial) (catarrh) (spasmodic)late-onsetwithexacerbation (acute) → J45.901

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

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