RemitBench/Denial codes/MA04

MA04 remark code

MA04 is a secondary claim asking for something specific. The payer is willing to process this. It cannot, because it does not know what the primary plan did.

The code list's own wording: Secondary payment cannot be considered without the identity of or payment information from the primary payer. The information was either not reported or was illegible.

What it means: You billed a secondary payer without telling it what the primary did. Secondary payment is calculated from the primary's adjudication, so without that there is nothing to calculate.
Who owes the money: Nobody yet Nothing was decided. Do not bill the patient. This claim is incomplete rather than denied, and the patient has two plans neither of which has finished with it.
Is appealing worth it: No. Send the primary's remittance. An appeal in response to a request for information puts the claim in a slower queue and answers nothing.

This is a request for information, not a denial, and it is worth a lot. Secondary claims that stall here are among the most commonly abandoned recoverable claims in a practice. The money is available, the payer has said it will consider paying, and all it needs is a document you already have.

Why the payer sent it

The primary remittance was not attached to the claim.
It was attached and did not link to the claim.
The primary payer's identity was not reported in the claim data.
The information was sent on paper and was not readable.
The primary's adjudication is incomplete, so there is nothing to send yet.
The claim was sent as a primary claim to a secondary payer, which produces this immediately.

The reason codes it rides with

Remark code	What it adds
22	The care may be covered by another payer under coordination of benefits. See CO-22.
23	The impact of a prior payer's adjudication. What this line looks like once it works. See CO-23.
252	An attachment or other documentation is required. See CO-252.
16	The claim lacks information. See CO-16.

What to do next

Check the primary has actually finished

You cannot send an adjudication that has not happened. If the primary is still processing, this is a wait rather than a task.
Send the primary remittance the way that payer accepts

Electronic coordination data, portal upload, or paper with a cover sheet. Sending it the wrong way produces a second MA04 and looks to the payer as though you never replied.
Make sure it links to the claim

Control numbers matter. An attachment that arrives unlinked is the same as no attachment, and this is the single most common reason the second attempt fails too.
Fix the coordination record so the next one goes out complete

If your system knows the patient has two plans, the primary details should flow automatically. Where they do not, this recurs on every claim for that patient.

Codes that get mixed up with MA04

Code	How it differs from MA04
N4	Missing, incomplete or invalid prior insurance carrier remittance. Very close, and often used interchangeably.
22	Another payer may be primary. The order was wrong, rather than the information missing. See CO-22.
252	An attachment is required to adjudicate. The general version of the same request. See CO-252.
23	The prior payer's adjudication. What a correctly completed secondary claim shows. See CO-23.

Code

How it differs from MA04

Missing, incomplete or invalid prior insurance carrier remittance. Very close, and often used interchangeably.

Another payer may be primary. The order was wrong, rather than the information missing. See CO-22.

252

An attachment is required to adjudicate. The general version of the same request. See CO-252.

The prior payer's adjudication. What a correctly completed secondary claim shows. See CO-23.

MA04 in dental

Dual dental coverage is common, and secondary dental claims stall here more than anywhere else. The claims are usually small, which is exactly why they get abandoned, and why the total across a year is larger than anyone expects.

Small claims are the ones that get dropped

A secondary dental claim might be worth a modest amount, and working it takes a few minutes. Practices quietly stop doing it, and nobody decides to. Running a report of secondary claims sitting on MA04 is usually a short exercise with a surprising total.

Automate the attachment if you can

Most practice software can carry the primary's adjudication into the secondary claim automatically once the primary remittance is posted. Where that is switched on, this remark largely disappears. Where it is not, every secondary claim is manual.

Questions people ask about MA04

Is MA04 a denial?

No. It is a request for the primary payer's information so the secondary payment can be calculated. The payer has effectively said it will consider paying once it knows what the first plan did, which makes this one of the most recoverable lines on a remittance.

I sent the primary remittance and got MA04 again. Why?

Usually because the attachment did not link to the claim, or it was sent by a route that payer does not accept. Control numbers matter here, and an unlinked attachment is treated exactly like no attachment at all.

Related codes

Back to all denial codes

RemitBench reads dental EOB PDFs and turns them into posting-ready lines, in your browser, with no upload. It does not read medical remittances today.

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