The J40–J4A section covers chronic lower respiratory diseases with 53 ICD-10-CM diagnosis codes, of which 39 are billable in fiscal year 2026. The section is organized into the 8 code ranges listed below.
✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
8
Code Ranges
53
Diagnosis Codes
39
Billable Codes
J40–J4A
Code Range
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
bronchitis due to chemicals, gases, fumes and vapors J68.0
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the J40–J4A Code Range
ICD-10 codes J40-J4A cover chronic lower respiratory diseases, including various forms of bronchitis, emphysema, chronic obstructive pulmonary disease (COPD), asthma, bronchiectasis, and chronic lung allograft dysfunction. These codes are used to classify persistent lung conditions affecting breathing over time.
This range begins with J40, describing unspecified bronchitis, which includes terms like tracheobronchitis and occupational bronchitis. It progresses through chronic bronchitis forms, such as simple (J41.0) and mucopurulent chronic bronchitis (J41.1), also known as smokers' cough or purulent bronchitis. Emphysema types (J43) such as panlobular and centrilobular relate to damaged lung tissue causing airflow obstruction. Codes starting at J44 address other chronic obstructive pulmonary diseases, including acute exacerbations and forms like bronchiolitis obliterans. Asthma codes (J45) specify severity and control level, covering mild intermittent to severe persistent asthma, including variants like exercise-induced bronchospasm (J45.990) and cough variant asthma (J45.991). Bronchiectasis (J47) codes cover dilated, damaged bronchi, with or without infection. Finally, J4A describes chronic lung allograft dysfunction, complications affecting lung transplant patients. These codes help healthcare providers accurately document and manage chronic respiratory illnesses.
Questions About This Page
How many codes are in the J40-J4A range?
The J40-J4A range contains 53 ICD-10-CM diagnosis codes in FY 2026. 39 of them are billable, and the rest are category headers that organize the section.
What conditions does J40-J4A cover?
The range covers chronic lower respiratory diseases. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Bronchitis NOS
Bronchitis with tracheitis NOS
Catarrhal bronchitis
Tracheobronchitis NOS
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
Chronic bronchitis NOS
Chronic tracheitis
Chronic tracheobronchitis
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
bronchiolitis obliterans and bronchiolitis obliterans syndrome J44.81
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
emphysema due to inhalation of chemicals, gases, fumes or vapors J68.4
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
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
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
asthma with chronic obstructive pulmonary disease J44.89
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
bronchiolectasis
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.
