2026 ICD-10-CM Diagnosis Code J45.990Exercise induced bronchospasm

ICD-10-CM Codes›J00–J99›J40-J4A›J45

ICD-10-CM J45.990
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J45.990 is a billable ICD-10-CM diagnosis code for exercise induced bronchospasm. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 202 through 203. Coders also document this condition as bronchospasm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Asthma.

J45.990 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 229 for payment year 2026.

This medical diagnosis code is frequently used in Pediatrics medical specialties to designate conditions such asthma.

Code Identity

ICD-10-CM Code
J45.990
Billable Status
Yes — Valid for Submission
Code Describes
Exercise induced bronchospasm
Short Description
Exercise induced bronchospasm
Same as the full description in the CMS dataset.
Parent Code
J45.99
Other asthma

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ40-J4AChronic lower respiratory diseases
CategoryJ45Asthma
This CodeJ45.990Exercise induced bronchospasm

Medicare Risk Adjustment (HCC)Billing

J45.990 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 229 — Chronic Obstructive Pulmonary Disease, Bronchiectasis, and Other Asthma
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bronchospasm
  • Constriction of airway
  • Exercise induced bronchospasm
  • Stenosis of bronchus

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP009
Asthma
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Bronchospasm

    sudden contraction of the smooth muscles of the bronchial wall.

  • Bronchospasm, CTCAE|Bronchospasm|Bronchospasm

    a disorder characterized by a sudden contraction of the smooth muscles of the bronchial wall.

  • Exercise-Induced Bronchospasm|Exercise induced bronchospasm

    sudden contraction of the smooth muscles of the bronchial wall that occurs during or following exercise.

  • Grade 1 Bronchospasm, CTCAE|Grade 1 Bronchospasm

    mild symptoms; intervention not indicated

  • Grade 2 Bronchospasm, CTCAE|Grade 2 Bronchospasm

    symptomatic; medical intervention indicated; limiting instrumental adl

  • Grade 3 Bronchospasm, CTCAE|Grade 3 Bronchospasm

    limiting self care adl; supplemental oxygen indicated

  • Grade 4 Bronchospasm, CTCAE|Grade 4 Bronchospasm

    life-threatening respiratory or hemodynamic compromise; intubation or urgent intervention indicated

  • Grade 5 Bronchospasm, CTCAE|Grade 5 Bronchospasm

    death

  • Bronchospasm, CTCAE|Bronchospasm|Bronchospasm

    a disorder characterized by a sudden contraction of the smooth muscles of the bronchial wall or narrowing of the airway. may be manifested as wheezing.

  • Grade 2 Bronchospasm, CTCAE|Grade 2 Bronchospasm

    symptomatic; medical intervention indicated; limiting instrumental adl or mild/moderate impact on age-appropriate normal daily activity (pediatric)

  • Grade 3 Bronchospasm, CTCAE|Grade 3 Bronchospasm

    supplemental oxygen indicated; limiting self-care adl or severe impact on age-appropriate normal daily activity (pediatric)

Patient EducationClinical

Asthma

Asthma is a chronic (long-term) lung disease. It affects your airways, the tubes that carry air in and out of your lungs. When you have asthma, your airways can become inflamed and narrowed. This can cause wheezing, coughing, and tightness in your chest. When these symptoms get worse than usual, it is called an asthma attack or flare-up.

The full article covers:

  • What is asthma?
  • What causes asthma?
  • Who is at risk for asthma?
  • What are the symptoms of asthma?
  • How is asthma diagnosed?
  • What are the treatments for asthma?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert J45.990 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
493.81 Exercse ind bronchospasm
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J45.990Overview

What is the ICD-10 code for exercise induced bronchospasm?

The ICD-10-CM code for exercise induced bronchospasm is J45.990 (sometimes written as J45990). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is J45.990 (Other asthma) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report exercise induced bronchospasm on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J45.990 group to?

When exercise induced bronchospasm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 202, 203, with relative weights from 0.6700 to 0.9712 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J45.990?

Under the General Equivalence Mappings, exercise induced bronchospasm converts to ICD-9-CM 493.81 (exercse ind bronchospasm). The mapping is a direct match.

Does J45.990 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: J45.990 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 229 (Chronic Obstructive Pulmonary Disease, Bronchiectasis, and Other Asthma).