ICD-10 April 1, 2026 Updates Are Here!

Effective April 1, 2026, CMS and the CDC have released the mid-year ICD-10 update package; and while the headline numbers may look modest, the compliance and revenue implications are anything but. This update quietly reshapes how coders apply long‑familiar codes, and it introduces a wave of new PCS options that affect DRGs, denials, and documentation across the board.

Here’s what every coder, CDI specialist, and revenue cycle professional needs to know before the effective date.

Zero New CM Codes—But Major Excludes Note Changes

You read that right: the ICD-10-CM component for April 2026 adds no new diagnosis codes, no deletions, and no revisions. The Official Guidelines are also unchanged.

So why does it still matter?

Because buried in the tabular addendum are instructional note changes, especially Excludes note revisions, that directly affect how you code, not just what you code.

Headline changes include:

• 16 Excludes1 notes converted to Excludes2
  Code pairs that were previously mutually exclusive can now be reported together when clinically appropriate and documented. This affects a wide range of chapters, from neoplasms and blood disorders to nervous system, circulatory, respiratory, and symptoms/signs codes.
• Hypertensive Emergency (I16.1) sequencing change
  The “Use Additional code” directive has been replaced with “Code also”, putting the sequencing decision back in the coder’s hands based on the circumstances of admission and the condition chiefly responsible for the stay.
• Fontan-associated coding correction
  For Fontan-associated lymphatic dysfunction, the companion code for protein-losing enteropathy changes from K90.89 to K90.49 effective April 1.
• Dyspepsia + Heartburn (R10.13 + R12)
  These symptoms can now be dual‑coded when both are documented, thanks to an Excludes1 → Excludes2 change.

These aren’t trivial edits. Missed note changes are a classic driver of claim denials and DRG downgrades in mid-year audit cycles.

To make this easier, CCO has prepared a separate “April 1, 2026: Complete List of ICD-10-CM Excludes Note Changes” quick‑reference guide. It walks through all 16 Excludes1→Excludes2 revisions, with:

• The affected code
• What was previously excluded
• What is now allowed
• A practical clinical scenario for each change

You can use that guide side‑by‑side with this April 1 blog and the full white paper for education, auditing, and coding QA.

80 New PCS Codes—Spanning 6 Sections

On the procedure side, the action is much more visible. CMS has added 80 new ICD‑10‑PCS codes and deleted 2, bringing the total PCS code set to 79,193 codes across 17 affected tables. The MS‑DRG Grouper has been updated to Version 43.1 to keep pace.

Some of the most noteworthy additions:

• 🫀 Brand‑new table for Bladder Transfer (0TX)
  Finally captures the Boari bladder flap procedure when the bladder is transferred to replace ureteral function.
• 🫁 New qualifier “Capsule Intact” for Prostate Resection (0VT)
  Distinguishes simple prostatectomy (capsule intact) from radical prostatectomy in PCS for the first time.
• 💉 Embryonic Stem Cell administration reclassified
  Root operation changes from Transfusion (302) to Introduction (3E0). Two existing transfusion codes are deleted and replaced with new Introduction codes.
• 🧬 New Technology Group 11 additions
  Includes:
  • CAR‑T therapy anitocabtagene autoleucel (anito‑cel) in XW0
  • Cochlear gene therapy DB‑OTO via inner‑ear insertion (X9H) and intracochlear introduction (XW0)
  • GORE VIABAHN VIAFORT venous stent (X27)
  • Ellora™ Obstetrical System for vaginal/cervical dilation (XU7)
• 🏥 23 new Physical Rehabilitation codes in Section F
  Cover microcurrent stimulation electrotherapy and wound management for thorax and abdomen, expanding how advanced wound‑care services are reported.

What You Need to Do Before April 1

To be ready when the clock strikes midnight on April 1, make sure your organization has:

1. Updated encoder and grouper software to MS‑DRG Version 43.1, so new PCS codes group correctly and edits fire as expected.
2. Pulled and reviewed the CM and PCS addenda from the CMS ICD‑10 page, especially the Excludes note changes and new PCS tables.
3. Trained coders on the 16 Excludes1→Excludes2 revisions and the new I16.1 “Code also” sequencing requirement.
4. Briefed CDI teams on documentation needs for:
   • Simple vs. radical prostatectomy
   • Bladder transfer/Boari flap
   • Transmural vs. transpapillary hepatobiliary drainage
   • New Technology devices and therapies (anito‑cel, DB‑OTO, VIAFORT, Ellora, etc.)
5. Updated charge masters and order entry to align with new PCS codes used in your service lines (cardiology, urology, wound care, obstetrics, ENT, rehab).

Want the Full Breakdown (and the Complete Excludes List)?

This blog is the overview. If you want the full story, CCO has created two companion resources for CCO Club members:

• A comprehensive white paper covering every change in the April 1, 2026 ICD‑10 update — chapter by chapter and table by table, including code examples, CDI query prompts, DRG/revenue impact, and a practical compliance checklist.
• A “Complete List of ICD-10-CM Excludes Note Changes” quick‑reference, detailing all 16 Excludes1→Excludes2 revisions with real‑world scenarios.

Both are available exclusively to CCO Academy members.

👉 Request the full ICD‑10 April 2026 White Paper and the Excludes Note Changes Quick Reference here.

Whether you’re CPC, CCDS, CPMA, or CPB, this is a mid‑year update you’ll want fully digested and documented before April 1.