HR 1865 is the "Further Consolidated Appropriations Act of 2019" which combined numerous appropriations due Oct 1 into one bill. The bill was introduced in the House March 25, 2019 as the "National Law Enforcement Museum Commemorative Coin Act:
link to inroduced summary:
https://www.congress.gov/bill/116th-congress/house-bill/1865/summary/00
Congress, from time to time, will take an inactive bill (usually a revenue bill passed in the House) and add new text by amendment. The text may replace most or all of the original bill text. Senate approves the bill and then House will vote to approve the amended changes. Avoids discussion on the House floor and committees.
Middle Class Health Benefits Tax Repeal Act
was a totally different bill:
S.684 - Middle Class Health Benefits Tax Repeal Act of 2019
Sen. Heinrich, Martin [D-NM] (Introduced 03/06/2019)
Summary: This bill repeals the excise tax on employer-sponsored health care coverage for which there is an excess benefit (high-cost plans). The repeal applies to taxable years beginning after December 31, 2019.
https://www.congress.gov/bill/116th-congress/senate-bill/684
63 Cosponsors
No Action was taken on the bill
Related Bills is H.R.748 - CARES Act, so some of the provisions may/may not have been included in the CARES bill. That was the relief package signed into law March 27 and did have 369 cosponsors.
https://www.congress.gov/bill/116th-congress/house-bill/748