Claim Response Code A3/106/85: Billing Provider Charge Errors Explained

When Charges Belong to a Different Provider: Understanding the A3/106/85 Response Code

A claim shouldn't carry charges that aren't the billing provider's responsibility, but it happens more often than billing teams expect. The A3/106/85 response code combination flags exactly this issue, and it's a common reminder that charge assignment deserves a careful look before submission.

What the Code Means

The A3/106/85 combination is built from three components of X12 claim status reporting. Code category A3 indicates the claim has been returned as unprocessable and was never entered into the payer's adjudication system. Code status 106 identifies the issue as charges that aren't the responsibility of the entity named on the claim. Because status 106 requires an entity code to specify which party is involved, code entity 85 identifies that entity as the billing provider.

Put together, these codes communicate that the claim included charges the billing provider isn't responsible for, often because those charges belong to a different provider or entity entirely.

Why It Occurs

This response code typically points to a charge assignment problem rather than a coding or eligibility issue. A few scenarios commonly trigger it.

• The claim includes services that were rendered by a different provider. This can happen in group practices or multi-provider settings where a claim is built from a template or carried over from a prior visit without updating the rendering provider details for each line item.

• Charges that should have been billed under a different billing entity appear on the wrong claim. This is common when a practice operates under multiple tax IDs or billing arrangements, such as a hospital-owned practice billing separately from a hospital-based service, and a charge gets routed to the wrong entity during claim creation.

• The billing provider information in the NM1*85 segment doesn't match the provider who performed or supervised the service. This mismatch can occur during claim scrubbing or batch submission, particularly when staff are working from outdated provider templates or copying claims as a starting point for new ones.

How to Address It

When A3/106/85 appears, start by reviewing the claim line by line to confirm which provider rendered each service. Cross-reference this against the billing provider listed in box 33a and the rendering provider in box 24j on the CMS-1500 (formerly the HCFA-1500) form.

Next, confirm the billing provider's NPI and tax ID match the entity that should be receiving payment for those specific charges. If your practice operates under multiple billing arrangements or tax IDs, verify the claim was built under the correct one from the start.

If the review confirms that some or all the charges belong to a different provider or entity, separate those charges into a new claim filed under the correct billing provider. Don't simply remove the charges. They still need to be billed correctly to the appropriate party to avoid lost revenue.

Once corrections are made, resubmit the claim. Because A3/106/85 is a pre-adjudication rejection, no remittance is generated for the original submission, so track the original submission date carefully to protect your timely filing window.

Key Takeaways

• A3/106/85 signals that a claim was rejected because it included charges that aren't the billing provider's responsibility.

• This typically results from charge assignment errors in multi-provider practices, multiple billing entities, or claims built from outdated templates.

• Relevant fields include CMS-1500 boxes 24j and 33a, and the NM1*85 segment on the X12 837.

• Misassigned charges should be moved to a new claim under the correct billing provider, not simply deleted.

• A pre-submission review process that verifies provider and charge assignment helps prevent this rejection from recurring.

Build Charge Accuracy Into Every Submission

Catching charge assignment errors before submission saves time and protects revenue. Office Ally solutions help billing teams validate claims and provider information before they reach the payer. To see how Service Center™ by Office Ally can support cleaner claim submissions across your provider mix, visit officeally.com/get-started.

‍AI Disclosure
This blog was generated with the assistance of artificial intelligence (AI) and reviewed by Office Ally’s subject-matter experts for accuracy. It is intended for informational purposes only and does not constitute medical, legal, or billing advice.