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Revenue cycle inefficiencies, including claim denials, coding errors, delayed reimbursement, and prior authorization workload, impose substantial administrative and financial burdens on healthcare organizations. Machine learning has been proposed as a decision-support approach for improving prediction, automation, and workflow prioritization in these areas. This systematic review examined peer-reviewed and closely related scholarly literature from 2017 to 2023 on machine learning for healthcare revenue cycle analytics. The review focused on claim denial prediction, coding automation, payment delay forecasting, and prior authorization support. A PRISMA 2020-compliant review process was used, including structured database searching, dual screening, and domain-based narrative synthesis. Risk of bias was assessed using criteria adapted from PROBAST-AI, with attention to temporal validation, data leakage, and implementation relevance. The literature showed the greatest maturity in automated clinical coding and emerging but narrower evidence for claim denial prediction. Evidence for payment delay forecasting and prior authorization support was more limited, with few studies describing prospective implementation or measured operational impact. Machine learning shows promise for improving revenue cycle decision support, but most evidence remains retrospective and technically oriented. Deployment is constrained by data fragmentation, explainability requirements, workflow integration, and regulatory caution.