J45

Non-Billable

ChapterJ00–J99

Rankcategory

Official Description

Asthma

Metadata & Insights

•2026 ICD-10-CM Edition - Effective October 1, 2025.
•Non-billable category (requires more specific sub-code).
•Chapter 10: Diseases of the Respiratory System (J00-J99).

CH10 Parent Instructions

Excludes2(Not included here)

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)

Use Additional Code

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)

J40-J4A Parent Instructions

Excludes1(Not coded here)

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

Excludes2(Not included here)

cystic fibrosis (E84.-)

Instructional Notes

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)

detergent asthma (J69.8)
miner's asthma (J60)
wheezing NOS (R06.2)
wood asthma (J67.8)

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)

Clinical Hierarchy

CH10Diseases of the respiratory system (J00-J99)

J40-J4AChronic lower respiratory diseases (J40-J4A)

J45Asthma

J45.2Mild intermittent asthma

J45.3Mild persistent asthma

J45.4Moderate persistent asthma

J45.5Severe persistent asthma

J45.9Other and unspecified asthma

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to J45:

blockJ40-J4A

Chronic lower respiratory diseases (J40-J4A)

View context instructions

chapterCH10

Diseases of the respiratory system (J00-J99)

View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to J45. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

25 raw paths

Asthma, asthmatic (bronchial) (catarrh) (spasmodic)25 unique routes

Direct index entry→J45

allergic extrinsic→J45(3 variants)

with(2 variants)

exacerbation (acute)→J45

status asthmaticus→J45

childhood→J45(3 variants)

with(2 variants)

exacerbation (acute)→J45

status asthmaticus→J45

cough variant→J45