All ICD10 Codes
J45Non-billable

Asthma

Diseases of the Respiratory System·Chronic lower respiratory diseases (J40-J4B)·category·FY 2027

18 billable codes under J45: 10 are a CC; 3 map to HCC 279 (Severe Persistent Asthma).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

Asthma: Asthma is a chronic (long-term) lung disease. It affects your airways, the tubes that carry air in and out of your lungs. When you have asthma, your airways can become inflamed and narrowed. This can cause wheezing, coughing, and tightness in your chest. When these symptoms get worse than usual, it is called an asthma attack or flare-up.

Read more about asthma on MedlinePlus · Source: MedlinePlus, National Library of Medicine

Instructional notes

Includes: conditions that are coded here

  • 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: not coded here, use a different code

Excludes2: not included here, code separately if applicable

  • 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)

Use additional code: add a second code for this, listed after this one

  • 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 applies, from Chronic lower respiratory diseases (J40-J4B)

These notes sit on J40-J4B and apply to every code under it, including J45.

Excludes1: not coded here, use a different code

  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)

Excludes2: not included here, code separately if applicable

  • cystic fibrosis (E84.-)

All codes under J45

J45 can't be used on a claim. Pick a billable code below; grey headings group them.

MS-DRGs

As the principal diagnosis, the billable codes under J45 group to these MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Codes whose notes mention J45

If you are coding one of these, its note tells you to add J45 too (Code Also, Use Additional Code), code it first (Code First), or not use it together (Excludes1).

  • F54 Code First: asthma (J45.-)
  • J44 Code Also: type of asthma, if applicable (J45.-)
  • J60-J70 Excludes2: asthma (J45.-)
  • J98.01 Excludes1: asthma (J45.-)
  • R06.2 Excludes1: Asthma (J45.-)