Inspire Medical Systems (INSP) Stock Plunges on Medicare Coding Reversal: Latest News, Analyst Forecasts, and What Investors Are Watching
Inspire Medical Systems, Inc. (NYSE: INSP) stock tumbled sharply on Thursday, December 18, 2025, after a key Medicare coding tailwind that had fueled recent optimism suddenly looked far less certain. By early afternoon in the U.S. session, INSP was down in the mid-to-high teens, reflecting investor anxiety that a reimbursement “upgrade” tied to a specific billing code may not stick—at least not in the clean, nationwide way many had modeled. MarketBeat What happened to INSP stock on 18.12.2025? The immediate catalyst: two Medicare Administrative Contractors (MACs)—CGS and Noridian—reportedly pulled CPT code 64568 for hypoglossal nerve stimulation (HGNS) and redirected billing