First Pass Resolution Rate in Medical Billing: Definition, Formula, and How It Relates to Denials
First pass resolution rate is the percentage of claims that were resolved by the payer’s first response to the first submission: paid at the expected amount, or correctly adjudicated to patient responsibility, with no rejection, correction, resubmission or appeal. It measures the whole process from submission to final result, not one step.
Clean claim rate measures the claim data. First pass resolution rate measures the result. The difference between the two is the follow-up work your staff do.
Where you see it
| Place | What it shows |
|---|---|
| Practice management system claim history | Each claim’s submission count, dates and responses |
| 277CA acknowledgment | Whether the first submission was accepted into adjudication or rejected |
| 835 remittance | The first adjudication: paid, denied or adjusted, with the group code, CARC and RARC |
| Follow-up and appeal logs | Which claims needed follow-up, and why |
| Billing service reports | Often labeled first pass rate, first pass yield or first pass acceptance; ask which definition is meant |
Three metrics, one claim
| Clean claim rate | Claim denial rate | First pass resolution rate | |
|---|---|---|---|
| Question | Did the payer accept the claim without finding a defect? | How often did the payer deny on the first remittance? | Was the claim finished on the first response? |
| Measured from | 277CA and 835 | 835 | 277CA, 835 and the claim history |
| Counts against it | Rejections; denials for claim errors | All denials, including coverage and medical necessity | Rejections; all denials; underpayments that needed appeal; pends and no-response claims |
| Does not count against it | Coverage denials (by convention); underpayments; pends | Rejections (they never reach an 835); underpayments | Nothing that needed follow-up |
| Points to | Charge entry and registration | Charge entry, registration, authorization, payer behavior | Everyone, including the payer |
Every first-pass-resolved claim was clean. Not every clean claim resolved, and not every unresolved claim was denied: a claim with no 835 at 45 days is not a denial, but it was not resolved either. That is why the three rates never add up to 100 percent.
How to compute it from a practice management system
The formula is claims resolved on the first response divided by claims first submitted in the period. The work is in defining “resolved” and getting the fields.
| You need | From | Used to |
|---|---|---|
| Original submission date per claim | Claim history | Assign the claim to a month |
| Submission or resubmission count | Claim history | Exclude anything sent more than once |
| 277CA status for the first submission | EDI or clearinghouse response files | Exclude rejections (X12 category codes A3, A6, A7, A8) |
| First 835 claim status and the CAS adjustments | Remittance posting | Decide whether the claim paid, denied or adjusted |
| Expected allowed amount by payer and CPT | Fee schedule or contract table | Decide whether a paid claim paid correctly |
| Appeal and correction log | Follow-up work queue | Exclude anything that needed follow-up |
A claim is resolved on the first pass when all of the following are true: it was sent once; the 277CA accepted it; the first 835 paid every line, or adjusted lines only to patient responsibility (PR-1, PR-2, PR-3) or a contractual adjustment (CARC 45) that matches the contract; and nobody had to work it again. A claim that paid 0.00 because the whole allowed amount went to the deductible is resolved. A claim that paid every line but paid 77412 at the 77407 rate is not, if you appealed it.
Most practice management systems cannot produce this from a single report. The usual build is a monthly extract of claims with their submission count and first-835 status, joined to the appeal log, with the “paid correctly” test done against the contract table. It is an afternoon’s work to set up and ten minutes a month after that.
What to expect
No fetched MGMA or HFMA page publishes a first pass resolution benchmark, and HFMA’s MAP Keys do not define the measure. The published figures do set an upper limit: with MGMA reporting first-submission denials of 7 to 8 percent over the past four years and the AAFP calling 5 to 10 percent average, and front-end rejections on top of that, a first pass resolution rate in the high 80s is ordinary and one above the clean claim rate is a measurement error. The useful comparison is your own gap: clean claim rate minus first pass resolution rate is the share of accepted, well-formed claims the payer still did not finish, which is a payer behavior and authorization number more than a billing one.
Worked example
The same radiation oncology group as in the clean claim rate example, 1,200 claims submitted in October, measured on December 15. Illustrative figures.
| Outcome on the first response | Claims |
|---|---|
| Rejected on 277CA | 33 |
| Denied on first 835 for a claim error (CARC 4, 16, 18, 11) | 54 |
| Denied on first 835 for authorization or medical necessity (CARC 197, 50) | 11 |
| Paid, but 77412 paid at the 77407 rate and appealed | 18 |
| No 835 received at 45 days | 22 |
| Resolved on the first pass | 1,062 |
First pass resolution rate: 1,062 divided by 1,200, or 88.5 percent. Clean claim rate for the same month: 1,113 divided by 1,200, or 92.8 percent. Denial rate by claim: 65 denied of 1,167 adjudicated, or 5.6 percent. The 4.3 point gap between clean and resolved is 11 authorization denials, 18 downgrades and 22 claims with no response, none of which the scrubber could have prevented and all of which the follow-up team had to work.
What to do
- Define “resolved” in writing, including the paid-correctly test, before anyone reports the number.
- Report it next to clean claim rate and denial rate every month. The three together separate your defects from the payer’s behavior.
- Chase the no-response claims. They are the easiest part of the gap to miss, and the claims most likely to pass the timely filing limit.
- Read the gap by payer. A plan with a clean claim rate like everyone else’s and a first pass resolution rate ten points lower is downgrading, pending or losing authorizations. Raise it with the payer under the contract.
- Iridium Suite’s accounts receivable work queues hold each claim’s follow-up history, which is the record you need to know whether a claim was worked again after the first response.
Related terms
- Clean claim rate
- Claim denial rate
- Days in A/R
- Net collection rate
- Allowed amount
- PR-1, PR-2 and PR-3: patient responsibility codes
Further reading: X12: Claim Status Category Codes (277CA); CMS: Health Care Payment and Remittance Advice (the 835); MGMA Stat, July 2026: Days in A/R holds steady, with first-submission denial figures; HFMA MAP Keys, 2023 edition (PDF).
Frequently asked
What is first pass resolution rate?
The percentage of claims that were resolved by the payer's first response to the first submission, with no rejection, no correction, no resubmission and no appeal. Resolved means paid, or adjudicated correctly to patient responsibility or a contractual adjustment; a claim that paid short and needed an appeal did not resolve on the first pass.
How is first pass resolution rate different from clean claim rate?
Clean claim rate asks whether the payer accepted and processed the claim without finding a defect in it. First pass resolution rate asks whether the claim was finished on that first response. A claim can be clean and still be denied for authorization or medical necessity, paid at the wrong rate, or pended for records; those count against first pass resolution but not against clean claim rate.
What is a good first pass resolution rate?
No MGMA or HFMA page publishes a first pass resolution benchmark. It is always lower than the clean claim rate, because it also subtracts coverage denials, underpayments and claims with no response. Compute it the same way each month and watch the gap between it and your clean claim rate; that gap is the share of claims your follow-up staff have to work.
How do you calculate first pass resolution rate in a practice management system?
Take the claims first submitted in a month. Count the ones with exactly one submission, no 277CA rejection, and a first 835 that paid the claim or adjudicated it entirely to patient responsibility or contractual adjustments at the expected amount. Divide by the claims submitted. You need the original submission date, a resubmission count and the 835 claim status for each claim.