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J45 ICD-10-CM Code: Asthma

J45 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

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Code lookupJ45

FY 2026 Apr update / Diseases of the respiratory system (J00-J99) / Chronic lower respiratory diseases (J40-J4A)

J45

Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidance

Asthma

OverviewRisk ModelsCode BookDocumentationAuditNotesEdition comparison

CMS-HCC V28

N/A

—

Not mapped

CMS-HCC V24

N/A

—

Not mapped

ACA/HHS

N/A

—

Not mapped

ESRD/PACE

N/A

—

Not mapped

RXHCC

N/A

—

Not mapped

Code Book Path

Official
J4Chronic lower respiratory diseases (J40-J4A)J45Asthma

Inclusion Terms

Official

No inclusion terms are included in this display for J45. Check the code and parent instructions in the Code Book.

Excludes 2

Official
  • 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)
  • certain conditions originating in the perinatal period (P04-P96)Inherited from J00-J99, J40-J4A
  • certain infectious and parasitic diseases (A00-B99)Inherited from J00-J99, J40-J4A
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from J00-J99, J40-J4A
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from J00-J99, J40-J4A
  • endocrine, nutritional and metabolic diseases (E00-E88)Inherited from J00-J99, J40-J4A
  • injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from J00-J99, J40-J4A
  • neoplasms (C00-D49)Inherited from J00-J99, J40-J4A
  • smoke inhalation (T59.81-)Inherited from J00-J99, J40-J4A
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from J00-J99, J40-J4A
  • cystic fibrosis (E84.-)Inherited from J00-J99, J40-J4A

Related Codes

Official
J45.2Mild intermittent asthmaJ45.3Mild persistent asthmaJ45.4Moderate persistent asthmaJ45.5Severe persistent asthmaJ45.9Other and unspecified asthma

Includes

Official
  • 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

Excludes 1

Official
  • detergent asthma (J69.8)
  • miner's asthma (J60)
  • wheezing NOS (R06.2)
  • wood asthma (J67.8)
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)Inherited from J40-J4A

Code First

Official

No Code First sequencing instructions are included in this display for J45. Check the code and parent instructions in the Code Book.

Use Additional

Official
  • code to identify:
  • eosinophilic asthma (J82.83)
  • exposure to environmental tobacco smoke (Z77.22)Inherited from J00-J99
  • exposure to tobacco smoke in the perinatal period (P96.81)Inherited from J00-J99
  • history of tobacco dependence (Z87.891)Inherited from J00-J99
  • occupational exposure to environmental tobacco smoke (Z57.31)Inherited from J00-J99
  • tobacco dependence (F17.-)Inherited from J00-J99
  • tobacco use (Z72.0)Inherited from J00-J99
  • code, where applicable, to identify:Inherited from J00-J99

Code Also

Official

No Code Also instructions are included in this display for J45. Check the code and parent instructions in the Code Book.

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Code
J45
Description
Asthma
HCC (V28)
No CMS-HCC V28 mapping
RAF reference coefficient
—
Billable
No
Payment year
2026

Coder workflow notes

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What This Code Means

J45 is the ICD-10-CM diagnosis code for asthma. J45 sits in the ICD-10-CM chapter for diseases of the respiratory system (j00-j99), within the section covering chronic lower respiratory diseases (j40-j4a).

Header codes like J45 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J45 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

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

Excludes 1, Do NOT code together

Excludes 2, Not included here, may code separately

  • 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)

Child Codes

J45.2Mild intermittent asthma
J45.3Mild persistent asthma
J45.4Moderate persistent asthma
J45.5Severe persistent asthma
J45.9Other and unspecified asthma

Code Hierarchy

└J45Asthma
└J45Asthma

More on J45

Referenced in blog posts

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