Today, IRS released Revenue Procedure 2018-10 which modifies and supersedes certain sections of Revenue Procedure 2017-58 and supersedes Revenue Procedure 2017-37 to reflect by new tax law (pub. L no. 115-97 enacted December 22, 2017. This law changed the annual inflation adjustment factor from the “Consumer Price Index” (CPI) to a new factor known as “chained CPI.” These changes are effective as of the beginning of 2018.
As a result, only the HSA family contribution limit has been affected for 2018. The limit has been decreased from $6,900 to $6,850. All the other contribution limits, HDHP limits and out-of pocket limits remain the same for 2018.
BASIC’s Guide to HSAs has been updated. You can access the full guide at this link.
Find more details on the changes here is an article from SHRM.