All ICD10 Codes

J21

Non-Billable
ChapterJ00–J99
Rankcategory
Official Description

Acute bronchiolitis

Use a more specific code (4 billable)
J21.0Acute bronchiolitis due to respiratory syncytial virusJ21.1Acute bronchiolitis due to human metapneumovirusJ21.8Acute bronchiolitis due to other specified organismsJ21.9Acute bronchiolitis, unspecified
Metadata & Insights
  • •Non-billable category (requires more specific sub-code).
  • •Chapter 10: Diseases of the Respiratory System (J00-J99).

CH10 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • 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)

J20-J22 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)
  • chronic obstructive pulmonary disease with acute lower respiratory infection (J44.0)

Instructional Notes

Includes
  • acute bronchiolitis with bronchospasm
Excludes2(Not included here. Code separately if applicable.)
  • respiratory bronchiolitis interstitial lung disease (J84.115)

Clinical Hierarchy

BillableHas subcodes
CH10Diseases of the respiratory system (J00-J99)
J20-J22Other acute lower respiratory infections (J20-J22)
J21Acute bronchiolitisNot billable
J21.0Acute bronchiolitis due to respiratory syncytial virusBillable
J21.1Acute bronchiolitis due to human metapneumovirusBillable
J21.8Acute bronchiolitis due to other specified organismsBillable
J21.9Acute bronchiolitis, unspecifiedBillable

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to J21:

blockJ20-J22
Other acute lower respiratory infections (J20-J22)
View context instructions
chapterCH10
Diseases of the respiratory system (J00-J99)
View context instructions

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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