; . (b) Temporary payment amount for tests furnished during 2018 through 2020 and related requirements Section 1834A of the Social Security Act ( 42 U.S.C. 1395m–1 ) is amended— (1) in subsection (b)(1)(A), by striking and (d) and inserting , (d), and (j) ; and (2) by adding at the end the following new subsection: (j) DNA Specimen Provenance Assay clinical diagnostic laboratory tests (1) Temporary payment amount for tests furnished during 2018 through 2020 Notwithstanding the payment amount that would otherwise apply under this section, with respect to a DNA Specimen Provenance Assay clinical diagnostic laboratory test furnished on or after January 1, 2018, and before January 1, 2021, the payment amount under this section shall be equal to 85 percent of the amount determined under the fee schedule under section 1833(h)(1) for 2016 for HCPCS code 81265. (2) HCPCS code assignment The Secretary shall assign an HCPCS code to the DNA Specimen Provenance Assay clinical diagnostic laboratory test. (3) Ensuring proper billing and payment (A) Use of modifier to ensure proper payment The Secretary may use a modifier to facilitate making payment under this section with respect to a DNA Specimen Provenance Assay clinical diagnostic laboratory test. (B) Paid claims sample error rate (i) In general The Secretary shall conduct a post-payment review of a sample of not less than 50 claims for DNA Specimen Provenance Assay clinical diagnostic laboratory tests for which payment is made under this part. The sample reviewed under the preceding sentence may be taken from claims paid to more than one supplier. (ii) Posting on Internet website Not later than July 1, 2019, the Secretary shall post on the Internet website of the Centers for Medicare & Medicaid Services the number of claims with errors identified based on the reviews conducted under clause (i). . (c) Effective date The amendments made by this section shall apply to DNA Specimen Provenance Assay clinical diagnostic laboratory tests furnished on or after January 1, 2018.