CMS has released the final 2017 Medicare clinical laboratory fee schedule (CLFS) payment determinations for new and reconsidered test codes, including determinations regarding whether CMS will use crosswalking or gapfilling to establish payment rates for specific tests. Under the final determinations, all tests reviewed for 2017 are being crosswalked. CMS also released the final national limitation amount (NLA) for tests gapfilled for 2016 (Multianalyte Assays with Algorithmic Analyses and Genomic Sequencing Procedures).