The 2026 Denial Code Cheat Sheet
30 CARC denials your billing team sees every week. For each: the real root cause, the appeal move that actually works, and how to prevent it next time.
6 deepest denials covered in full: CO-45, CO-97, CO-16, CO-50, CO-109, CO-151
24-code quick reference table for your A/R desk
Print-friendly format. 8 pages. Tape page 4 to your billing workstation
Built by AAPC-certified coders, not marketing fluff
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30 CARC denial codes. Root causes, appeal moves, prevention tactics. Built by AAPC-certified coders. No credit card. No newsletter spam. Just the PDF.
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$262B
Denied annually (US)
11.8%
Avg initial denial rate
65%
Never reworked
60%+
Overturn rate on first appeal
Inside the PDF
What you actually get when you download
Root cause analysis for 6 top denials
CO-45 (contractual), CO-97 (bundling), CO-16 (missing info), CO-50 (medical necessity), CO-109 (wrong payer), CO-151 (frequency). Why the denial happens, with the specific RARC pairings to watch.
Appeal strategy with specific moves
What to attach to win the appeal. Which denials are not worth appealing. Modifier additions that turn a denial into a corrected claim, not a written letter.
Prevention tactics by code
How to keep each denial from happening again. Front-end workflow changes, scrubber edits, payer policy library upkeep.
24-code quick reference table
CO-1, CO-2, CO-3, CO-18, CO-22, CO-24, CO-26, CO-27, CO-29, CO-31, CO-39, CO-96, CO-119, CO-125, CO-140, CO-146, CO-149, CO-167, CO-170, CO-181, CO-197, CO-204, CO-231, CO-234. One-line description plus action for each.
Overturn rate signal for each top denial
Some denials carry 80% overturn rates when worked correctly. Others should never be appealed. The cheat sheet tells you which is which so your A/R team triages right.
Sources cited (not made up)
CMS NCCI manual, AMA CPT, MGMA denial benchmark, OMHA appeal statistics, Becker's Hospital Review. We tell you where every number comes from.
Who this is for
Built for the people who actually work the claims
This is not a marketing piece. It is a working reference for billing professionals who need to triage denials fast and stop wasting time on appeals that will never overturn.
Practice managers
Use the quick reference to set policy on what your A/R team fights vs writes off.
Billers and A/R staff
Print page 4 and keep it at your desk. Saves looking up RARC codes one at a time.
Coders
Understand the appeal path for the denials your work touches. Especially CO-97 modifier rules.
Physicians and owners
Know what your team is up against. The deepest 6 explain why some denials cost more to fight than they pay.
Want us to work these denials for you?
Go Medical Billing is a full-service medical billing company. AAPC-certified coders, all 50 states, starting at 2.49 percent of collections. We work the denials your in-house team is too busy to chase.