The evidence in this database dates from 2019 and is US-based. This is intended to ensure the suitability of the database for the intended use, which is to inform CMS coverage policy.

Any data from prior years or other jurisdictions would be less valid for the current purpose due to the facts that they do not reflect conformance with CPT codes nor the associated CMS requirements for billing those codes.

Evidence generated outside the US would not meet the “standard of care” criterion for the control groups.

Evidence generated prior to this time was adequate to justify creation of the initial CPT codes but may suffer from variance in implementation; evidence generated after the codes were established better reflect current practice and are more relevant to present-day coverage decisions.