2026 ICD-10-CM Diagnosis Code J45.52Severe persistent asthma with status asthmaticus
ICD-10-CM Codes›J00–J99›J40-J4A›J45
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Risk Adjusts — HCC 279
- Chronic Condition
J45.52 is a billable ICD-10-CM diagnosis code for severe persistent asthma with status asthmaticus. 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, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 29 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Asthma.
For Medicare Advantage risk adjustment, J45.52 maps to CMS-HCC Category 279 (Severe Persistent Asthma) under the V28 model, adding a risk factor of about 0.818 for a community, non-dual, aged beneficiary in 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
J45.52 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2026.
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.
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.
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 J45.52 to ICD-9-CMHistory
Code HistoryHistory
Questions About J45.52Overview
What is the ICD-10 code for severe persistent asthma with status asthmaticus?
The ICD-10-CM code for severe persistent asthma with status asthmaticus is J45.52 (sometimes written as J4552). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is J45.52 (Severe persistent asthma) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report severe persistent asthma with status asthmaticus on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J45.52 group to?
When severe persistent asthma with status asthmaticus is the principal diagnosis on an inpatient stay, it groups to MS-DRG 202, 203, 791, 793, with relative weights from 0.6700 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is J45.52 a CC or MCC?
CMS lists J45.52 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 29 closely related codes in its exclusion list.
What is the ICD-9 equivalent of J45.52?
Under the General Equivalence Mappings, severe persistent asthma with status asthmaticus converts to ICD-9-CM 493.01 (ext asthma w status asth) and 493.11 (int asthma w status asth). The mapping is approximate, so confirm the match fits the documentation.
What HCC is J45.52?
J45.52 (severe persistent asthma with status asthmaticus) maps to CMS-HCC Category 279 (Severe Persistent Asthma), commonly written as HCC 279, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. In the Part D prescription drug model it maps to RxHCC 228.
Does J45.52 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, J45.52 adds a risk adjustment factor of about 0.818 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.594 to 0.873 depending on the payment segment). A more severe related category (HCC 276, HCC 277, and HCC 278) supersedes it when both are reported. See the full factor table on the HCC 279 category page.
