Search around and you’ll find plenty of 2024- and 2025-vintage articles confidently predicting an ICD-11 switchover in the U.S. “by 2026” or “by 2027.” That timeline hasn’t held up. Here’s the actual, current status — not the speculation.
The short answer: there’s no U.S. implementation date
As of 2026, the United States has no official implementation date for ICD-11, and no Notice of Proposed Rulemaking has been published. CMS’s own ICD-10 resource pages confirm this indirectly: rather than announcing any transition, CMS and CDC continue actively maintaining and updating ICD-10-CM and ICD-10-PCS, including new code sets effective October 1, 2026. If a transition were imminent, that’s not where the investment would be going.
What’s actually happened so far
Progress has been real, just slow and preliminary:
- The National Committee on Vital and Health Statistics (NCVHS) has issued recommendations urging HHS to begin ICD-11 research in 2019, 2021, and again in 2024.
- A dedicated ICD-11 workgroup was established in late 2022.
- No formal federal rulemaking process has started. Under HIPAA, any new coding standard has to go through a formal rulemaking process before it can become mandatory — and that process hasn’t begun.
Earlier industry projections putting implementation in the 2025–2027 window are, per current tracking, effectively off the table. Some analysts think mortality reporting (a narrower, statistical-use case) could move on a separate, faster track than full clinical billing use — but that’s not confirmed either. Full morbidity/billing implementation is more realistically estimated to land in the late 2020s at the earliest, and possibly later.
Why the U.S. is moving slower than other countries
A few structural reasons explain the lag, and they’re not going away quickly:
- The U.S. needs its own Clinical Modification. ICD-10-CM itself is a heavily expanded, US-specific version of the WHO’s ICD-10 — over 71,000 codes. A comparable US-specific “ICD-11-CM” has to be developed before adoption can happen, not just a straight swap to the WHO version.
- The crosswalk is genuinely hard. Only about 23.5% of existing codes map one-to-one between ICD-10-CM and ICD-11. The rest require “post-coordination” — combining multiple ICD-11 codes to capture what one ICD-10-CM code currently represents — which is a substantial mapping and system-rebuild project across tens of thousands of codes.
- No single coordinating authority has been designated. NCVHS specifically called this out as of 2024: no lead federal office has been assigned to drive the transition, which slows everything downstream.
What you should actually do right now
Nothing urgent, and that’s the point of this post. There’s no compliance deadline to prepare for, no crosswalk to start building yet, and no rulemaking to comment on. The useful thing to do is keep half an eye on NCVHS recommendations and any future Notice of Proposed Rulemaking, rather than acting on secondhand “ICD-11 is coming” articles that overstate how close this actually is. If you see a training vendor or consultant pushing urgent “ICD-11 readiness” services right now, that’s a reasonable moment for healthy skepticism.
Takeaway
ICD-11 is coming to the U.S. eventually, but “eventually” currently means no rulemaking, no date, and likely years away for full billing use. Keep investing your training and system-update effort in the ICD-10-CM/CPT annual cycles that actually have real deadlines — not a transition that hasn’t formally started.