This Act may be cited as the Medicare IVIG Access Enhancement Act of 2025.

(a) In general Section 1861 of the Social Security Act (42 U.S.C. 1395xU.S. Code — Title 42, Section 1395xView official source on GovInfo) is amended— (1) in subsection (s)(2)(Z), by inserting (and, beginning January 1, 2027, for the treatment of chronic inflammatory demyelinating polyneuropathy and multifocal motor neuropathy) after primary immune deficiency diseases; and (2) in subsection (zz), by inserting (or, beginning January 1, 2027, with diagnosed chronic inflammatory demyelinating polyneuropathy and multifocal motor neuropathy) after primary immune deficiency disease. (b) Authority for variance in payments Section 1842(o)(8) of the Social Security Act (42 U.S.C. 1395u(o)(8)U.S. Code — Title 42, Section 1395u(o)(8)View official source on GovInfo) is amended by inserting and may vary depending on whether such administration is related to treatment of a primary immune deficiency disease or the treatment of chronic inflammatory demyelinating polyneuropathy or multifocal motor neuropathy (as determined appropriate by the Secretary through notice and comment rulemaking) after of 2012.