J40-J4A
Chronic lower respiratory diseases
Chronic lower respiratory diseases (J40-J4A) is a block within ICD-10-CM Chapter 10: Diseases of the respiratory system. It holds 8 categories.
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Excludes2
Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.
- cystic fibrosis (E84.-)
Categories in J40-J4A
- J40Bronchitis, not specified as acute or chronic
- J41Simple and mucopurulent chronic bronchitiscategory
- J42Unspecified chronic bronchitis
- J43Emphysemacategory
- J44Other chronic obstructive pulmonary diseasecategory
- J4AChronic lung allograft dysfunctioncategory
- J45Asthmacategory
- J47Bronchiectasiscategory
Source
ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.