Codes that coincide
I12.9 + I15.0Excludes1 pairs that can’t be billed together.
UnitedHealthcare Medicare Advantage enforces Excludes1 on professional claims since March 1, 2026.
Catch it before the claim goes out.
Cortex Lens flags codes that coincide, missing sides, and unspecified codes on the chart you're billing in Practice Fusion, with the reason behind each one.
Works inside Practice Fusion. Read-only, so Lens never changes your chart.
The denials you fix every week
Flags go both ways. If the note doesn't support a code or a level, Lens says so.
Side not given
M25.569 → M25.561The note says right knee. The code doesn’t.
Payers including Anthem deny unspecified laterality when a more specific code exists.
Two codes that should be one
E11.9 + N18.32 → E11.22Diabetes and kidney disease coded apart when one combination code covers both.
ICD-10-CM “with” convention, Official Guidelines I.A.15.
CKD stage
Hypertensive kidney disease listed with no stage, or two different stages listed at once.
Problem-list cleanup
Duplicate, outdated, or overlapping entries, like E11.9 still listed next to E11.22.
Visit level
Whether the note supports the level on the claim, up or down. Your practice can turn this check on.
Show the provider why.
- Every flag explains why, from the chart and the coding rules, so you can point to it.
- Diagnosis questions go to the provider who saw the patient. Lens never guesses a diagnosis.
- You make the change in Practice Fusion. Lens rechecks and marks it fixed.
Free for your billing team.
- Billers, coders, and office staff never count toward your practice’s price.
- Lens works in the Practice Fusion screens you already bill from.
- Nothing to install on the EMR side. Just add Lens to Chrome and sign in with your practice’s invite.
“I’d do my own research and then check what Cortex says, and it was usually pretty spot-on.”
2,500+charts checked in Practice Fusion
400+code pairs caught that payers deny together
180+codes caught missing a left or right
See Lens on a real chart.
A 20-minute walkthrough with our team.