J21.9
BillableAcute bronchiolitis, unspecified
Acute bronchiolitis, unspecified
Coding Notes
Inclusion Terms
Alternative clinical terms for this condition
- Bronchiolitis (acute)
Includes
Conditions included under this code
- acute bronchiolitis with bronchospasm
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •smoke inhalationT59.81
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •chronic obstructive pulmonary disease with acute lower respiratory infectionJ44.0
- •respiratory bronchiolitis interstitial lung diseaseJ84.115
Use Additional Code
Additional codes that should follow this code
Related Codes(3)
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(49)
SNOMED CT
- Acute bronchiolitis with obstruction718004
- Bronchiolitis4120002
- Bronchial spasm4386001
- Bronchospasm4386001
- Acute bronchiolitis5505005
- Acute capillary bronchiolitis5505005
- Capillary pneumonia5505005
- Pulmonary necrosis7159003
- Acute bronchiolitis with bronchospasm15199004
- Bronchiolitis exudativa52409006
- Acute obliterating bronchiolitis59903001
- Acute bronchitis with bronchospasm80257001
- Necrotising bronchiolitis87695000
- Necrotizing bronchiolitis87695000
- Acute exudative bronchiolitis195737004
- Acute viral bronchiolitis233602006
- Diffuse panbronchiolitis430476004
- Chronic bronchiolitis737180005
- Acute bronchospasm98641000119100
UMLS
Clinical Terms
- Bronchial spasm
- Acute bronchospasm
- Acute exudative bronchiolitis
- Acute obliterating bronchiolitis
- Pulmonary necrosis
- Bronchospasm
- Bronchiolitis (acute)
- Acute viral bronchiolitis
- bronchiolitis acute
- Acute bronchiolitis with obstruction
- Necrotising bronchiolitis
- Bronchiolitis exudativa
- Acute bronchitis with bronchospasm
- Chronic bronchiolitis
- Acute bronchiolitis with bronchospasm
- Acute bronchiolitis (disorder)
- Capillary pneumonia
- Diffuse panbronchiolitis
- Bronchiolitis
- Acute capillary bronchiolitis
- Necrotizing bronchiolitis
Frequently Asked Questions
What is the ICD-10 code for acute bronchiolitis, unspecified?
The ICD-10-CM code for acute bronchiolitis, unspecified is J21.9. The full clinical description is "Acute bronchiolitis, unspecified". J21.9 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code J21.9 mean?
ICD-10-CM code J21.9 represents “Acute bronchiolitis, unspecified”. It is classified under Chapter 10: Diseases of the Respiratory System and is a billable/specific code that can be used on a claim.
Is J21.9 a billable code?
Yes, J21.9 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is J21.9 in?
J21.9 is in Chapter 10: Diseases of the Respiratory System (codes J00-J99).
What codes cannot be used with J21.9?
J21.9 has Excludes1 notes indicating codes that cannot be used together with it, including: chronic bronchiolitis (J44.89).
Are additional codes required with J21.9?
Yes, when using J21.9, also report: 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).
What SNOMED CT codes does J21.9 map to?
J21.9 maps to 15 SNOMED CT concepts: 5505005, 15199004, 718004, 80257001, 98641000119100, and 10 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for J21.9?
J21.9 is linked to 1 UMLS Concept Unique Identifier: C0001311. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does J21.9 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like acute bronchiolitis, unspecified affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of J21.9?
J21.9 maps to the ICD-11 code: CA41.Z (Acute bronchiolitis, unspecified).
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Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.