J45.9 – Other and unspecified asthma

ICD-10-CM 2027 diagnosis code · Chronic lower respiratory diseases

Non-billable header

ICD-10-CM code J45.9
Code
J45.9 (claims format: J459)
Description
Other and unspecified asthma
Billable
No – use a more specific code below
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
10. Diseases of the respiratory system (J00-J99)
Block
J40-J4B Chronic lower respiratory diseases
Parent codes
J45

Billable codes under J45.9

J45.9 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

J45 – Asthma

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 (not coded here):
Excludes2 (not included here):
  • 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:
  • 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)

Block J40-J4B

Excludes1 (not coded here):
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Excludes2 (not included here):
  • cystic fibrosis (E84.-)

Index terms for J45.9

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in J45

Frequently asked questions

What is ICD-10 code J45.9?

J45.9 is the ICD-10-CM code for other and unspecified asthma, in the block J40-J4B (Chronic lower respiratory diseases).

Is J45.9 a billable code?

No. J45.9 is a header code with more specific child codes; report one of the billable codes listed above.

What category does J45.9 belong to?

It belongs to category J45 – Asthma.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.