What it means on your remittance
A verified EVV visit exists and matches the claim — but the units on the claim line are more than the visit supports. The clock-in/clock-out span verified fewer units than you billed. Everything else matched; the time didn't.
Why it happens
- The caregiver clocked a shorter span than scheduled (late arrival, early clock-out), so the verified time supports fewer units than billed.
- A missed clock-in or clock-out shortened the verified span, and the visit was verified with the shortened time.
- Unit-conversion rounding: the state's conversion table rounds the verified minutes down across the unit boundary you billed.
- The claim's units were entered from the schedule instead of from the verified visit time.
How to fix it, step by step
- 1Compare the claim line's units against the verified clock-in/clock-out span in your EVV system (Ohio publishes a unit-conversion table for exactly this).
- 2If the recorded call times are wrong, adjust them in the EVV portal with the appropriate reason code and re-verify (ODM's resolution: 'Adjusting Call Times and Dates').
- 3If the call times are right and you overbilled, correct the claim's units down to what the visit supports.
- 4Watch the rounding boundary — a 58-minute visit may not support a 4-unit (60-minute) bill under your state's table.
- 5Resubmit the corrected claim once units and verified time agree.
How to tell it apart
N820 means everything matched EXCEPT time: provider, client, and service all lined up. That makes it the most mechanical of the EVV denials — and per its X12 text ('EVV system units do not meet requirements of visit') it's EVV-specific in any state. Pennsylvania's equivalent on the RA is ESC 927/937, and PA denies the whole line rather than paying the verified portion.
The bigger picture
Every manual time adjustment you make to fix an N820 counts against your state's edit-rate measure (Pennsylvania's 85%-without-edits rule, for example). Fixing the claim is the short game; coaching the caregivers whose visits keep needing time edits is what makes this code stop appearing.
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Run the free Denial X-RayCommon questions
What does denial N820 mean?
A verified EVV visit exists and matches the claim — but the units on the claim line are more than the visit supports. The clock-in/clock-out span verified fewer units than you billed. Everything else matched; the time didn't.
How do I fix a N820 denial?
Reconcile billed units to the verified visit duration. If the recorded call times are wrong, correct them in the EVV portal with a reason code and re-verify. Check your state's unit-conversion rounding table before resubmitting the adjusted claim.
Will the payer pay the units the visit DID verify?
Don't count on it. The published state behaviors deny the mismatched line rather than automatically paying the smaller amount — Pennsylvania states explicitly that it does not cut claims back to verified units. Bill what the visit supports.