Alphabetic Index FY2027

J45

Asthma

FY2027Chapter 10: Diseases of the respiratory system/J40–J4B Chronic lower respiratory diseases

Non-billable headerNot valid on its own. Use one of the more specific codes under it.

J45 is a non-billable ICD-10-CM code category for asthma. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are J45.2 Mild intermittent asthma, J45.3 Mild persistent asthma, J45.4 Moderate persistent asthma, J45.5 Severe persistent asthma and 1 more. Its coding notes include a Use additional code instruction, 5 Excludes1 entries and 14 Excludes2 entries.

Guidelines tip

From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.

An exacerbation is a worsening of the chronic condition. An infection alone does not make it one.

Guidelines I.C.10.a.1COPD and asthma: acute exacerbationRead the official text

Use additional code

Add the listed code as a secondary code, if known.

This code
  • code to identify:
    • eosinophilic asthma (J82.83)
    • exposure to environmental tobacco smoke (Z77.22)
    • exposure to tobacco smoke in the perinatal period (P96.81)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)
Also from chapter/block level (7 notes)
Inherited from Chapter 10 Diseases of the respiratory system
  • code, where applicable, to identify:
    • exposure to environmental tobacco smoke (Z77.22)
    • exposure to tobacco smoke in the perinatal period (P96.81)
    • history of tobacco dependence (Z87.891)
    • occupational exposure to environmental tobacco smoke (Z57.31)
    • tobacco dependence (F17.-)
    • tobacco use (Z72.0)

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
Also from chapter/block level (1 note)
Inherited from J40–J4B Chronic lower respiratory diseases
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

This code
  • asthma with chronic obstructive pulmonary disease (J44.89)
  • chronic asthmatic (obstructive) bronchitis (J44.89)
  • chronic obstructive asthma (J44.89)
  • other specified chronic obstructive pulmonary disease (J44.89)
Also from chapter/block level (10 notes)
Inherited from J40–J4B Chronic lower respiratory diseases
Inherited from Chapter 10 Diseases of the respiratory system
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • smoke inhalation (T59.81-)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Includes

Further defines or gives examples of the content of the category.

This code
  • 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

Notes

Also from chapter/block level (1 note)
Inherited from Chapter 10 Diseases of the respiratory system
  • When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).

More specific codes under J45 5