When an insurer rejects a claim outright: what to check, in order

Most rejected claims have failed on a detail, not on the treatment. A membership number in the wrong format, a date of birth that does not match the insurer's records, a practitioner code that was never mapped, a procedure code the insurer will not accept. All of those are fixable, usually the same day, and none of them need a letter.

The frustrating part is that a rejection rarely tells you which one it is in language you can act on. So before you spend an hour on the phone, it is worth working out what kind of rejection you are actually holding.

The short version

• Most rejections are data mismatches rather than clinical decisions.
• Work out whether it failed validation or was declined after assessment.
• Check the membership number, the patient details and the practitioner code first.
• Correct and resubmit the same claim rather than raising a new one.
• If it genuinely will not be paid, invoice the patient promptly and plainly.

Two different rejections, two different jobs

A claim submitted electronically passes through a clearing service before the insurer ever sees it, and it can stop there. Healthcode, which most UK private practices bill through, shows invoice progress as a row of coloured boxes, and its own guidance says one red box means the invoice has failed validation and needs to be corrected, while three green boxes mean the insurer has collected it.

A failed validation is not the insurer saying no. It is the invoice never having arrived. Nobody there has looked at it, so there is nothing to appeal and no decision to argue with. You correct the field and send it again.

The second kind is a claim that reached the insurer, was assessed, and came back unpaid. That one is a decision, and it needs a different conversation. In my experience the claims that sit unpaid the longest are usually the first kind, because nobody realised the invoice had not gone anywhere.

Work through the mismatches in order

Healthcode publishes the validation errors its clearing service returns, and the list is short enough to work through in a few minutes. The wording below is theirs, and between them these cover most of what stops an invoice.

• Start with the membership number. The error "No matching membership details can be found" means the policy number is incorrectly formatted or does not match the insurer's database, so retype it from the patient's own document rather than from your notes.
• Then check the name and date of birth. Where the patient demographics do not match the registration number, look for a spelling variant, a middle name you have not recorded, or a transposed digit in the date of birth.
• Check that the practitioner is recognised. An invalid specialist code usually means the practitioner is not recognised by that insurer, or has not been added to the list of people who can invoice from that site, which Healthcode resolves through the Private Practice Register or its customer services team.
• Look at the procedure code next. An invalid code means the insurer does not accept it or the format is wrong, and Healthcode's advice is to get pre-authorisation with the right codes and to ask its coding team about any code that keeps coming back.
• Finally, check the age of the invoice. If the latest service date on the bill exceeds the maximum invoice age, it has not been submitted within the deadline that insurer sets. Those deadlines differ, so the only route from there is to contact the insurer and discuss the case.

None of this needs a clinical opinion, which is the point. It is desk work, and it is the reason so many rejections outlive the week they were raised in.

Fix and resubmit rather than raising a new claim

When a field is wrong, the instinct is to void the invoice and start again with a clean one. That usually creates more work than it saves. A new invoice number is a new reference for you to track, and if the original did reach the insurer you now have two claims for one episode of care, which takes longer to unpick than the original error did.

Correct the field and resubmit the same claim. Then write down what you changed. In a month, when the same error turns up on a different patient, the note is worth more than the memory.

When the insurer did look at it and still said no

If the claim was assessed and declined, ask for the reason in writing before you do anything else. A reason given over the phone is hard to act on and impossible to refer back to when the same thing happens in March.

The patterns will be familiar to anyone who bills. No authorisation on file, or an authorisation that had expired before the session took place. Funding for that condition already used up. A policy that lapsed or changed at renewal. An excess that has not been met. Treatment that falls outside what the policy covers. Each of those has a different next step, and only some of them end with the insurer paying.

Be honest with yourself about which are worth the time. A rejection caused by a missing authorisation on a course of treatment that is still running is worth a phone call, because it protects the sessions still to come. A single session declined on an exclusion, on a policy that has since ended, usually is not. I would rather a clinic spent that hour on the four claims that will pay.

Invoicing the patient when the claim will not be paid

If the insurer is not going to pay, the patient is. That conversation goes better early than late, and better in plain numbers than in policy language. The patient did not choose the reason code and will not follow it.

Tell them what happened, what the outstanding amount is, and when you need it by. Then invoice promptly, with your payment terms on the invoice itself. The gov.uk guidance on invoicing and taking payment from customers sets out what an invoice has to contain and how payment terms work, which is worth reading once if you have never set yours deliberately.

Where the claim was paid at less than you invoiced rather than rejected outright, that is a different job with a different process, and I have written it up separately in chasing insurer shortfalls.

Write down why each one failed

A single rejection is an annoyance. The same rejection four times is a process problem, and you will only see it if the reason is recorded somewhere you will look again.

The place for that is the clinic's own system, against the invoice or the patient record, rather than a notebook by the phone. Most practice software will hold a note against an invoice, and if you work in Cliniko there is more on which admin jobs it handles well in my write-up of Cliniko for UK clinics. What the note says matters more than where it sits: the date, the field that failed, and what fixed it.

After a month of those notes the pattern shows up quickly. Membership numbers typed from memory at the desk. One practitioner who was never mapped for one insurer. A procedure code that was accepted last year and is not now. None of those are hard to fix. They are simply invisible until somebody writes them down.