J45.52 ICD-10-CM Code: Severe persistent asthma with status asthmaticus

Code

J45.52

Description

Severe persistent asthma with status asthmaticus

HCC (V28)

HCC 279 — Severe Persistent Asthma

RAF reference coefficient

0.818

Billable

Yes

Payment year

2026

HCC Category Mapping

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work J45.52 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for J45.52

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J45.52 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •Status asthmaticus indicates an acute exacerbation that is life-threatening and requires emergency intervention; always verify documentation supports both the severe persistent asthma diagnosis and the acute status asthmaticus component
• •This code should be paired with additional codes for any complications, comorbidities, or triggers (such as respiratory failure codes if applicable) to provide complete clinical picture

Clinical Significance

Severe persistent asthma with status asthmaticus is among the most dangerous asthma presentations — a patient with the highest baseline severity experiencing a life-threatening, treatment-refractory attack. This condition carries significant mortality risk, almost always requires ICU admission, and may necessitate mechanical ventilation or extracorporeal membrane oxygenation.

Documentation Requirements

• ✓Provider documentation explicitly stating 'status asthmaticus' in the context of severe persistent asthma
• ✓Baseline severity documented as severe persistent
• ✓Evidence of refractory bronchospasm: failure to respond to multiple bronchodilator treatments and systemic corticosteroids
• ✓ICU admission documentation with continuous monitoring
• ✓Ventilatory support details: non-invasive or mechanical ventilation parameters
• ✓Arterial blood gas results demonstrating severity (hypoxemia, hypercapnia, acidosis)

Commonly Confused Codes

• •J45.51: Severe persistent asthma with acute exacerbation: use when the attack responds to treatment
• •J45.50: Severe persistent asthma, uncomplicated: use for stable severe asthma at baseline
• •J45.42: Moderate persistent asthma with status asthmaticus: use when baseline is moderate (does NOT map to V28 HCC)
• •J96.00: Acute respiratory failure, unspecified: code additionally when respiratory failure develops

Child Codes