HCPCS Level II code A7021 describes supplies and accessories for lung expansion, airway clearance, continuous high-frequency oscillation, and nebulization devices (for example, handset, nebulizer kit, biofilter), representing ancillary respiratory therapy supplies used with oscillatory and nebulizer airway clearance systems; service type: respiratory therapy supplies and accessories; typical site of service: outpatient clinics, durable medical equipment settings, home health, and hospital respiratory therapy departments.

For related coverage guidance, see recent payer policy updates: Salivary Hormone Testing, Bone Turnover Markers Testing, Parathyroid Hormone, Phosphorus, Calcium, and Magnesium Testing.