Claim Adjustment Group Codes: Medical Billing's Forgotten Codes

by  Find-A-Code™
Sep 6th, 2023

Medical coding and billing discussions tend to focus on the codes medical billing departments rely on to create the bills they send to insurance companies. That is neither an accident nor inappropriate. Things like ICD-10, ICD-11, and CPT codes make up the lion's share of all the codes utilized in medical billing. But there is another group of codes that warrant at least some discussion.

Claim adjustment group codes (CAGW), and a companion set of codes known as claim adjustment reason codes (CARC), are just as important to medical coding and billing. But they are not utilized to code specific procedures, treatments, etc. They are utilized to help both payers and billers stay on the same page when claims are denied or adjusted.

Claims can be denied or adjusted for any number of reasons. When claims are denied, they are often sent back to the biller for adjustment. There are even some cases in which billers proactively make adjustments so as to prevent potential denials. In order to keep everyone on the same page, CAGW and CARC codes are utilized.

Tracking Payment Adjustments

Let us say you have a payer denying a claim due to some sort of perceived error. Whether or not the error is legitimate isn't clear. It needs to be investigated by the original biller. The payer would send the bill back with a CAGW code so that the biller could do what needs to be done. Throughout the process, both biller and payer can track the status of the claim and any adjustments being made.

CAGW codes are utilized to track billing adjustments. There are five different categories of codes to work with:

1. Contractual Obligation (CO) – Utilized for adjustments relating to contractual agreements between payers and providers.
2. Corrections and Reversals (CR) – Utilized when an adjustment is made to correct a specific error found on a claim. Correcting an incorrect medical code would be a good example.
3. Payer Initiated Reductions (PI) – Utilized by payers when they adjust a claim to reflect a copayment, deductible, etc.
4. Patient Responsibility (PR) – Utilized by billers to account for any financial obligations that are the patient's responsibility.
5. Other Adjustment (OA) – Utilized for any adjustments that do not fall under one of the previous four categories. This is essentially a catch-all code.

It should be noted that CAGW codes only account for the adjustments made to bills by either payer or biller. They do not explain the actual reason for the adjustments in any sort of detail. That's what CARC codes are for.

Both Codes Used Together

Both CAGW and CARC codes are used together for the purposes of providing billers with as much detail as possible. More detail makes it easier to figure out problems and make the necessary adjustments. But because CARC codes provide the detail in question, there are far more of them (hundreds, to be exact) compared to CAGW codes.

CARC 109 is a commonly utilized code. It indicates that a service or procedure provided is not covered by the payer. Seeing that code on a denied claim would prompt a medical biller to dig around to see if there is another payer involved. Otherwise, the bill becomes an out-of-pocket expense for the patient.

While ICD-10, ICD-11, and CPT codes make up the bulk of medical coding and billing, there are times when claims are either denied or adjusted. When either is the case, CAGW and CARC codes come into play. If you are a medical billing specialist, chances are you have encountered them during your career. Hopefully though, your experiences with them are minimal.