J45.901 – Unspecified asthma with (acute) exacerbation

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

Billable code

ICD-10-CM code J45.901
Code
J45.901 (claims format: J45901)
Description
Unspecified asthma with (acute) exacerbation
Billable
Yes – valid for HIPAA-covered transactions
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 › J45.9 › J45.90

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)

J45.90 – Unspecified asthma

Applicable to:
  • Asthmatic bronchitis NOS
  • Childhood asthma NOS
  • Late onset asthma

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 J45.901

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

Related codes in J45.90

Frequently asked questions

What is ICD-10 code J45.901?

J45.901 is the ICD-10-CM code for unspecified asthma with (acute) exacerbation, in the block J40-J4B (Chronic lower respiratory diseases).

Is J45.901 a billable code?

Yes. J45.901 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does J45.901 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.