** Shares of biotech firm Plus Therapeutics PSTV.O rise 3.6% to $3.45 premarket
** Co says the American Medical Association approved a new billing code for its CNSide test, effective July 1, 2026
** CNSide is used to detect cancer cells in spinal fluid in patients whose cancer has spread to the brain and spinal cord, a serious and often hard‑to‑diagnose condition - PSTV
** Says the new code should make it easier for doctors and hospitals to bill insurers, supporting wider use of the test
** Co says the approval marks a key step in the U.S. commercial rollout of its diagnostics business
** As of last close, stock down ~21% YTD
(Reporting by Sahil Pandey in Bengaluru)
((Sahil.Pandey@thomsonreuters.com))