CommercialCoverageMedium impact
Crit-Line In-Line Monitor (CPB 0373, reviewed 2026-05-26)
Aetna·Nephrology, Critical Care·Medical Policy
Effective date
May 26, 2026
We identified it
Aug 13, 2026
Summary
Aetna has classified the Crit-Line In-Line Monitor as experimental, investigational, or unproven for monitoring hematocrit and oxygen saturation during hemodialysis. This means claims for this device will not be covered under Aetna plans. Billing teams must deny or reject any claims submitted for Crit-Line monitoring services.
Action Required
By June 26, 2026: Billing team must update claim submission protocols to identify and reject any claims that include Crit-Line In-Line Monitor services or measurements. Update internal billing system rules to flag CPT codes 90935, 90937, and HCPCS code S9335 when submitted with Crit-Line device usage. Notify nephrology providers and dialysis centers in your network that Aetna will not cover Crit-Line monitoring effective immediately. Implement claim denial procedures with explanation code indicating non-covered experimental device. Any claims submitted for Crit-Line monitoring will be denied as not medically necessary.