Clean Claim Rate in Medical Billing: Definition, How to Measure It, and the Target
Clean claim rate is the percentage of claims a payer accepts and adjudicates on the first submission without a rejection, a denial for an error on the claim, or a request for more information. It is measured at the payer, from the 277CA acknowledgment and the 835 remittance, not at the scrubber or the clearinghouse.
Most billing systems report a high pass rate from their own edits. The rate that matters is based on what the payer sends back.
Where you see it
| Place | What it shows |
|---|---|
| Claim scrubber or edit report | Claims that passed your own edits with no manual intervention; HFMA’s MAP Key CL-1 measures exactly this |
| Clearinghouse dashboard | Claims the clearinghouse accepted and forwarded, and its own front-end rejections |
| 999 implementation acknowledgment | Whether the file’s syntax was accepted or rejected, as a batch |
| 277CA claim acknowledgment | Each claim’s status when the payer receives it: accepted into adjudication or rejected before it got there |
| 835 remittance | The adjudication result for each claim and line: paid, adjusted or denied, with the group code, CARC and RARC |
Three checks, three different numbers
A claim goes through three checks on its way to payment, and each check produces a rate that someone calls “clean.”
Check 1, your scrubber. HFMA’s CL-1 is the number of claims that pass edits requiring no manual intervention divided by the number of claims accepted into the claims processing tool, the first time the claim is scrubbed. It measures your charge entry against the rules built into the scrubber.
Check 2, the payer’s front end. The payer (or its clearinghouse) returns a 277CA with a claim status category code for each claim. In X12’s wording, A2 means “Acceptance into adjudication system”; A3 means “Returned as unprocessable claim,” rejected and “not entered into the adjudication system”; A6 and A7 mean rejected for missing or invalid information; A8 means rejected for a relational field in error. A1 means only that the claim was received, and X12 adds that it “does not mean that the claim has been accepted for adjudication.” A rejected claim never reaches an 835, which is why rejections are easy to miss.
Check 3, adjudication. The 835 carries the result. A denial with a claim-error reason code, for example CARC 16 (“Claim/service lacks information or has submission/billing error(s)”), CARC 4 (procedure code inconsistent with the modifier), CARC 11 (diagnosis inconsistent with the procedure), CARC 18 (exact duplicate), CARC 22 (another payer may be responsible), CARC 29 (filing time limit expired) or CARC 109 (not covered by this payer), means the claim was accepted but was not clean.
A clean claim passes all three checks. Being paid in full on the first pass is a fourth thing, covered under first pass resolution rate.
How to measure it
Clean claim rate equals claims submitted, minus claims rejected on a 277CA, minus claims denied on their first 835 for a correctable claim error, divided by claims submitted.
| Rule | Why |
|---|---|
| Count by claim, not by line | A claim with one bad line was not clean; HFMA uses the claim as the unit for its denial key for the same reason |
| Group by submission month, hold the month open about 45 days | Medicare and most commercial 835s arrive within that window; measuring too early overstates the rate |
| Do not count patient responsibility (PR-1, PR-2, PR-3) or contractual adjustments (CO-45) as unclean | The claim processed correctly; the balance is owed by the patient or written off under the contract |
| Decide how to treat coverage denials (CARC 50 medical necessity, CARC 197 no authorization) and write it down | They are not claim-data errors; many practices leave them out of the clean claim rate and count them in the denial rate instead |
The usual target
The figure quoted almost everywhere is 95 percent or higher. We could not find an MGMA or HFMA page that publishes it, so treat 95 as a convention. The published numbers are denial rates: MGMA’s benchmarking puts first-submission denials at 7 to 8 percent across the past four years and says practices can get below 5 percent, and the AAFP calls a 5 to 10 percent denial rate the industry average with below 5 percent more desirable. A practice at 7 percent first-submission denials and 2 to 3 percent front-end rejections is around 90 percent clean; 95 percent means the two together are under 5.
What drives it
| Driver | Where it shows | Fix |
|---|---|---|
| Eligibility and member ID | 277CA rejection (A7), or CARC 27 (coverage terminated) and CARC 22 (other payer) on the 835 | Real-time eligibility at scheduling and again before the first fraction |
| Deleted or invalid codes | 277CA rejection, or CARC 16 | Charge master maintenance; for 2026, no 77385, 77386, 77401, 77014 or G-codes on radiation claims |
| Modifier errors | CARC 4 | 77387 always with modifier 26; no 26 or TC on 77402, 77407 or 77412 |
| Diagnosis mismatch | CARC 11 | Z51.0 first on an antineoplastic course, the neoplasm second |
| Wrong payer or payer order | CARC 109, CARC 22 | Coordination of benefits at registration |
| Missing rendering, billing or referring NPI | CARC 16 with a remark code naming the field | Provider records that fill the claim automatically |
A claim scrubber raises the clean claim rate by catching the defects in that table before the claim leaves, so the 277CA and the 835 show only errors the scrubber has no rule for.
Worked example
A radiation oncology group submits 1,200 claims in October. Illustrative figures.
| Stage | Claims | Share |
|---|---|---|
| Submitted | 1,200 | 100 percent |
| Rejected on 277CA: 18 with a deleted delivery or guidance code for a 2026 date, 9 member ID, 6 missing rendering NPI | 33 | 2.8 percent |
| Accepted into adjudication | 1,167 | |
| Denied on first 835 for a claim error: CARC 4 on 77387 billed without 26 (24), CARC 16 (15), CARC 18 (9), CARC 11 (6) | 54 | 4.5 percent |
| Clean | 1,113 | 92.8 percent |
Eleven more claims denied with CARC 197 for a missing authorization; under the convention above they count in the denial rate, not here, because the claim data was right. The 24 CARC 4 denials are a single fix, the 26 modifier, worth two points of clean claim rate.
What to do
- Measure at the payer. Report the scrubber’s pass rate separately as HFMA’s CL-1; it is useful, but it is a different thing.
- Pull 277CA rejections every week. They do not appear on any remittance, and a rejected claim that nobody re-sends will eventually hit the timely filing limit.
- Group the month’s rejections and error denials by reason code, and hold the month open 45 days before calling the rate final.
- Iridium Suite’s claim scrubber checks each service line as it is entered against CCI edits, payer rules and radiation oncology frequency rules, including the modifier 26 requirement on 77387 and the 2026 deleted-code list.
Related terms
- Claim denial rate
- First pass resolution rate
- Days in A/R
- Net collection rate
- EDI: the 837, the 835 and the other HIPAA transactions
- Group codes and reason codes on a remittance
Further reading: X12: Claim Status Category Codes (277CA); X12: Claim Adjustment Reason Codes; CMS: Health Care Payment and Remittance Advice (the 835); HFMA MAP Keys, 2023 edition (PDF), CL-1 Clean Claim Rate.
Frequently asked
What is a clean claim?
A clean claim is one the payer accepts into adjudication on the first submission and processes without rejecting it, denying it for an error on the claim, or asking for more information. It may still pay less than billed, or apply the whole amount to the patient's deductible; clean describes the claim's data, not the payment.
What is a good clean claim rate?
The figure most often quoted is 95 percent or higher, but that is an industry convention rather than a published MGMA or HFMA benchmark. The published numbers are on the denial side: MGMA puts first-submission denials at 7 to 8 percent over the past four years, and the AAFP calls a 5 to 10 percent denial rate average and below 5 percent desirable. A clean claim rate above 95 percent means rejections and error denials together are under 5 percent.
How do you calculate clean claim rate?
Take the claims submitted in a month, subtract the claims rejected on a 277CA acknowledgment and the claims denied on their first 835 remittance for a correctable claim error, and divide by the claims submitted. Count by claim, not by line, and hold the month open about 45 days so the remittances have arrived.
Is clean claim rate the same as first pass resolution rate?
No. Clean claim rate measures whether the payer accepted and processed the claim without finding a defect. First pass resolution rate measures whether the claim was actually paid on the first submission with no rework of any kind, including no appeal. Every first-pass-resolved claim was clean, but not every clean claim resolves on the first pass.