<p>Blockchain-based healthcare systems require mechanisms that preserve data integrity while allowing controlled modification of sensitive records to satisfy regulatory and clinical correction requirements. Redactable blockchain frameworks have been proposed to address this challenge; however, existing approaches often introduce verification overhead, limited redaction scope, or reduced audit transparency. This paper presents the Redactable Blockchain for Healthcare (RBH) framework, which integrates Threshold and Attribute-Based Secret Sharing (TABSS) with Secure Chameleon Transaction Recording (SCTR) to enable policy-driven and auditable redactions in consortium healthcare environments. The proposed design maintains cryptographic traceability through structured audit metadata while supporting authorized updates without compromising ledger consistency. Analytical and experimental evaluations demonstrate that RBH improves redaction flexibility, audit transparency, and verification efficiency relative to existing redactable blockchain solutions such as SEREDACT. The framework further supports scalable metadata management and transparent audit validation suitable for healthcare governance workflows. Overall, RBH provides an enhanced approach to managing compliant, traceable healthcare record updates while preserving blockchain immutability under controlled authorization.</p>