Denial Code Deep Dive

The five denial codes behind nearly half of your denial volume

A five-part series breaking down the five “big rocks” driving denial volume, one code at a time.

Issue 1
Available now
Issue 2
Coming soon
Issue 3
Coming soon
Issue 4
Coming soon
Issue 5
Coming soon

Why we're deep diving
on denials

In an analysis of 70,544 denied claims across Joyful Health customer accounts, 5 denial codes accounted for 44% of total denial volume.

These codes sit at the top of the denial report at nearly every organization, year after year. Teams touch them constantly and rework them endlessly, and the volume holds steady anyway.

A single denial code often carries several unrelated problems underneath it, each diagnosed with a different question, each owned by a different team, each fixed in a different way. When they're represented in just one line on a report, the code points nowhere in particular.

This series breaks each of the 5 codes down, one at a time, providing you with tactical tips and recommendations for how to actually reduce recurrence in a meaningful way.

What each report covers

The distinct root cause families hiding inside a single code, with share of volume for each
Which team owns each fix, from credentialing to contracting to utilization review
What the denial looks like on the remit, and the diagnostic question to ask before resubmitting
Where the pattern can be caught upstream instead of worked after the fact, to reduce recurrence
Each part is a standalone report. Start with the code you're working now.

The themes running through the series

One code, several problems

Denial codes describe what the payer saw. They rarely describe what went wrong on your side. Separating the problems underneath is what turns a denial report into a work assignment.

Ownership travels; percentages don’t

The share of volume for each root cause shifts by specialty and payer mix. Which team owns the fix stays consistent, and that’s the part worth building around.

Recovery begets prevention

Working the claim resolves the dollar. Documenting and acting to fix the root cause is what keeps the next one from arriving.

The series

Issue 1

CO-16 Missing or invalid information

The most common denial reason we see, and the most often misdiagnosed. In this analysis, we sort CO-16 into eight distinct root cause families spanning seven functions, from credentialing to payer relations to intake. When the true root cause is missed, claims can age for 60+ days before the right team takes action.

Get the CO-16 deep dive

Get the CO-16 deep dive

Issue 2

CO-18 Duplicate claim or service

Roughly 12% of total denial volume. It sounds like the simplest code on the list: either a claim is a duplicate or it isn't. The false-positive pattern underneath tells a different story.

Coming soon

Issue 3

CO-96 Non-covered service

Accounting for about 7% of denial volume, CO-96 sounds definitive: the service simply isn’t covered. But coverage isn’t always the real problem. Benefit verification, coding, payer rules, and plan-specific exclusions can all lead to the same denial.

Coming soon

Issue 4

CO-22 Coordination of benefits

CO-22 represents about 6% of total denial volume. When multiple payers are involved, small gaps can create big problems. Outdated coverage information, incorrect payer sequencing, and missing coordination details can derail an otherwise valid claim.

Coming soon

Issue 5

CO-197 Prior authorization

At 5% of denial volume, prior authorization denials often begin well before a claim is submitted. Missing approvals, mismatched services, expired authorizations, and payer-specific requirements can turn an upstream workflow issue into a downstream denial.

Coming soon

Curious what your own denial mix looks like?

Our free A/R analysis shows you which root causes are driving your volume, which teams own them, and what's recoverable today.

Book my A/R analysis

Book my A/R analysis