HCPCS Level II code G0155 designates clinical social worker services provided in home health and hospice settings, billed per 15-minute unit. As a nationally used code for psychosocial assessment, counseling, and care coordination delivered by licensed clinical social workers, it supports billing for non-physician behavioral health interventions in patients' homes and hospice programs. The code matters for agencies managing home-based care capacity, hospice providers tracking multidisciplinary services, and payers assessing coverage for supportive services that affect outcomes and patient-centered care. Key payers addressed in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what G0155 represents clinically and operationally, plus coverage and reimbursement benchmarking context, common modifier usage, and implications for documentation and billing workflows. The publication highlights typical service settings, potential coding pitfalls, and comparative payer perspectives to inform revenue cycle and compliance teams. Data not available in the input are noted where applicable.