Charge lag
Charge lag is the average number of days between the date of service and the date the claim is submitted — the part of the timely-filing window you spend yourself.
Updated
Charge lag is the average time between a service being performed and its claim being submitted. It measures the practice's own speed: everything before the payer is involved — documentation completed, charges captured, coding finished, the claim scrubbed and sent.
It matters because it is the one delay entirely inside the practice's control, and it is spent out of a fixed budget. Every day of lag is a day of the payer's filing window already used, and a day the payment is further away.
How it’s calculated
Total days from date of service to submission, across all claims ÷ Number of claims submitted
Measure to submission, not to payment — this metric is about your speed, not the payer's. Use a settled period: claims from the last few days have not had a chance to be submitted yet, and including them drags the average down for a reason that is not real.
How to read it
A lower charge lag generally means claims reach the payer sooner, leaving more of the filing window in reserve and shortening the whole cycle behind it. There is no universal target: the achievable lag depends on the specialty, the documentation workflow, and how coding is staffed — a surgical practice and a primary care practice are not comparable on this. Read it as a trend, and read it beside your timely-filing denials rather than against an external figure.
What moves it
- How quickly clinical documentation is completed after the encounter
- Charge capture — whether charges are entered promptly and completely
- Coding turnaround, and whether coding queues on incomplete documentation
- Claims held by scrubber edits, and how fast those holds are worked
- Batch submission cadence — a claim finished on Monday and sent on Friday carries four days of lag it did not need
Commonly confused with
- Days in A/R: Days in A/R measures how long money takes to arrive after billing. Charge lag measures how long billing takes to happen. A practice can have an excellent A/R figure and still be losing a week before every claim is even sent.
- Timely filing: Timely filing is the payer's deadline. Charge lag is how much of that window you consume before submitting — the deadline is fixed, the lag is the part you choose.