The U. S. Trade Representative (USTR) has announced the extension of 429 product specific exclusions from China subject to Section 301 through May 31, 2024. The USTR will accept public comments beginning on January 22, 2024 to evaluate each exclusion on a case-by-case basis and determine which ones should be extended beyond May 31, 2024. You can access the information here.
Specifically, there are 352 Product Exclusions classified in the Harmonized Tariff Schedule of the United States HTS#99903.88.67 and 77 COVID related exclusions classified in HTS#9903.88.68. For your reference, previous Federal Register publications which included each one of the 429 individual classifications and descriptions that are being extended can be accessed here at link1 and link2.
U.S. Customs has informed the trade that its Automated Commercial Environment (ACE) system will be available to accept the extended product exclusions on January 4, 2024 as of 7:00 AM Eastern Standard Time. Thus, if entries of these products are made on January 2nd or 3rd, they will have to pay the Section 301 duties, and retroactive claims to obtain a refund of duties will have to be filed with Post Summary Corrections (PSC). Since the PSC process can easily take six months or longer, it is recommended to wait to file these entries on or after January the 4th.