2026 ICD-10-CM Diagnosis Code J45.991Cough variant asthma
ICD-10-CM Codes›J00–J99›J40-J4A›J45
- Billable — Valid for Submission
- Chronic Condition
J45.991 is a billable ICD-10-CM diagnosis code for cough variant asthma. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Asthma.
J45.991 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
Code Classification
Medicare Risk Adjustment (HCC)Billing
J45.991 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.
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.
- Cough variant asthma
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.
Clinical InformationClinical
Airway Remodeling
the structural changes in the number, mass, size and/or composition of the airway tissues.Asthma
a form of bronchial disorder with three distinct components: airway hyper-responsiveness (respiratory hypersensitivity), airway inflammation, and intermittent airway obstruction. it is characterized by spasmodic contraction of airway smooth muscle, wheezing, and dyspnea (dyspnea, paroxysmal).Asthma, Aspirin-Induced
asthmatic adverse reaction (e.g., bronchoconstriction) to conventional nsaids including aspirin use.Asthma, Exercise-Induced
asthma attacks following a period of exercise. usually the induced attack is short-lived and regresses spontaneously. the magnitude of postexertional airway obstruction is strongly influenced by the environment in which exercise is performed (i.e. inhalation of cold air during physical exertion markedly augments the severity of the airway obstruction; conversely, warm humid air blunts or abolishes it).Asthma, Occupational
asthma attacks caused, triggered, or exacerbated by occupational exposure.Asthma-Chronic Obstructive Pulmonary Disease Overlap Syndrome
syndrome with clinical features of both asthma and copd.Conyza
a plant genus of the family asteraceae. members contain alkenynes, daucosterol, friedelinol, conyzasaponins and other triterpenes.Cough-Variant Asthma
asthma which is characterized by chronic cough that is nonproductive without other asthmatic symptoms, e.g., wheezing, and paroxysmal dyspnea. cough-variant asthma is accompanied by airway hypersensitivity and may progress to classical asthma without treatment.Dyspnea, Paroxysmal
a disorder characterized by sudden attacks of respiratory distress in at rest patients with heart failure and pulmonary edema. it usually occurs at night after several hours of sleep in a reclining position. patients awaken with a feeling of suffocation, coughing, a cold sweat, and tachycardia. when there is significant wheezing, it is called cardiac asthma.Status Asthmaticus
a sudden intense and continuous aggravation of a state of asthma, marked by dyspnea to the point of exhaustion and collapse and not responding to the usual therapeutic efforts.Tylophora
a plant genus of the family asclepiadaceae. members contain phenanthro-indolizidine alkaloids.Occupational Exposure
the exposure to potentially harmful chemical, physical, or biological agents that occurs as a result of one's occupation.
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 J45.991 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J45.991Overview
What is the ICD-10 code for cough variant asthma?
The ICD-10-CM code for cough variant asthma is J45.991 (sometimes written as J45991). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is J45.991 (Other asthma) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report cough variant asthma on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J45.991 group to?
When cough variant asthma 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 J45.991?
Under the General Equivalence Mappings, cough variant asthma converts to ICD-9-CM 493.82 (cough variant asthma). The mapping is a direct match.
Does J45.991 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: J45.991 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).
