All ICD10 Codes

J45

Non-Billable
ChapterJ00–J99
Rankcategory
Official Description

Asthma

Use a more specific code (0 billable, 5 non-billable)
J45.2Mild intermittent asthmahas subcodesJ45.3Mild persistent asthmahas subcodesJ45.4Moderate persistent asthmahas subcodesJ45.5Severe persistent asthmahas subcodesJ45.9Other and unspecified asthmahas subcodes
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)

J40-J4A Parent Instructions

Excludes1(Not coded here. Use a different code.)
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Excludes2(Not included here. Code separately if applicable.)
  • 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. Use a different code.)
Excludes2(Not included here. Code separately if applicable.)
  • 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

BillableHas subcodes
CH10Diseases of the respiratory system (J00-J99)
J40-J4AChronic lower respiratory diseases (J40-J4A)
J45AsthmaNot billable
J45.2Mild intermittent asthmaSubcodes
J45.3Mild persistent asthmaSubcodes
J45.4Moderate persistent asthmaSubcodes
J45.5Severe persistent asthmaSubcodes
J45.9Other and unspecified asthmaSubcodes

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

MS-DRG Classification

2026

No direct MS-DRG triggers identified.

Cross Reference

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