Does HCPCS permanent national codes can be altered or deleted by a single payer alone define?

No, HCPCS permanent national codes cannot be altered or deleted by a single payer alone. HCPCS codes are maintained and updated by the Centers for Medicare & Medicaid Services (CMS) in collaboration with the American Medical Association (AMA) and other stakeholders. Any changes to HCPCS codes must go through a formal rulemaking process, which involves public input and review.