J96.21 ICD-10-CM Code: Acute and chronic respiratory failure with hypoxia

Code

J96.21

Description

Acute and chronic respiratory failure with hypoxia

HCC (V28)

HCC 213 — Cardio-Respiratory Failure and Shock

RAF reference coefficient

0.370

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 J96.21 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for J96.21

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J96.21 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •Requires documentation of both acute exacerbation and chronic respiratory failure with hypoxia; verify ABG results
• •Common in COPD patients presenting with acute decompensation; ensure both components are clearly documented

Clinical Significance

Acute and chronic respiratory failure with hypoxia represents an acute hypoxemic decompensation in a patient with pre-existing chronic respiratory failure. This is the most specific code for patients with baseline chronic respiratory compromise who develop acute worsening with documented low oxygen levels. It is commonly seen in COPD exacerbations, heart failure decompensation, and acute infections in patients with chronic lung disease.

Documentation Requirements

• ✓Provider documentation confirming acute and chronic respiratory failure with hypoxia
• ✓ABG showing acute hypoxemia (low PaO2) superimposed on chronic baseline changes
• ✓Documentation of prior chronic respiratory failure (home oxygen, prior ABGs, prior encounter documentation)
• ✓Identification of the acute precipitant (infection, exacerbation, heart failure, PE)
• ✓Treatment plan including oxygen therapy, ventilatory support, and management of the acute trigger

Commonly Confused Codes

• •J96.01: Acute respiratory failure with hypoxia does not capture the chronic component
• •J96.11: Chronic respiratory failure with hypoxia does not capture the acute decompensation
• •J96.20: Acute and chronic respiratory failure unspecified should not be used when hypoxia is documented
• •J96.22: Acute and chronic respiratory failure with hypercapnia is for CO2 retention, not hypoxia

Child Codes