J45.909 Unspecified asthma, uncomplicated
The ICD-10-CM code for Unspecified asthma, uncomplicated is J45.909 (FY2026). It is a billable, claim-ready diagnosis code.
Choosing between codes? See the guide: ICD-10 code for asthma.
Classification
- Section
- J40-J4A: Chronic lower respiratory diseases (J40-J4A)
- Category J45
- 26 codes (18 billable)
- FY2026 Status
- Stable since FY2024
Also Known As
ICD-10-CM Alphabetic Index entries that lead to J45.909:
- IgE asthma
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic)
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › allergic extrinsic
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › childhood
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › nonallergic (intrinsic)
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › predominantly allergic
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › late-onset
- Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › mixed
Inclusion Terms
- Asthma NOS
U.S. Hospital Utilization
- An estimated 1,591,230 U.S. inpatient stays in 2023 included J45.909 among the documented diagnoses.
- 2,475 stays listed it as the principal diagnosis.
Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.
Prevalence & Statistics
- In 2023, an estimated 27.8 million people in the United States (8.4% overall; 23.0 million adults and 4.8 million children) had current asthma, according to CDC's 2023 National Health Interview Survey data. (CDC — Most Recent Asthma Data (National Health Interview Survey), 2023)
Official Coding Guidelines
COPD/asthma: acute exacerbation vs uncomplicateda. Chronic Obstructive Pulmonary Disease [COPD] and Asthma 1) Acute exacerbation of chronic obstructive bronchitis and asthma The codes in categories J44 and J45 distinguish between uncomplicated cases and those in acute exacerbation. An acute exacerbation is a worsening or a decompensation of a chronic condition. An acute exacerbation is not equivalent to an infection superimposed on a chronic condition, though an exacerbation may be triggered by an infection.
Acute respiratory failure as principal diagnosisb. Acute Respiratory Failure 1) Acute respiratory failure as principal diagnosis A code from subcategory J96.0, Acute respiratory failure, or subcategory J96.2, Acute and chronic respiratory failure, may be assigned as a principal diagnosis when it is the condition established after study to be chiefly responsible for occasioning the admission to the hospital, and the selection is supported by the Alphabetic Index and Tabular List. However, chapter- specific coding guidelines (such as obstetrics, poisoning, HIV, newborn) that provide sequencing direction take precedence.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026