| Equipment | HCPCS Code | Primary ICD-10 (Medical Necessity) |
| Oxygen Concentrator | E1390 | J44.9 (COPD, unspecified) |
| CPAP Machine | E0601 | G47.33 (Obstructive Sleep Apnea) |
| Nebulizer (Standard) | E0570 | J45.901 (Asthma with exacerbation) |
| Portable Oxygen | E0431 | J96.11 (Chronic respiratory failure, hypoxia) |
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