CO B10 denial code
Claim adjustment reason code B10. Often reported as CO B10.
Reduced: component already paid
Unofficial reference. This is our own plain-English explanation, not the official code text. Payer rules differ. Verify with the payer and the official X12 code list. AlphaPrefix is not affiliated with X12, CMS or any payer. Data last updated .
What B10 means
The allowed amount was lowered because part of the procedure or test was already paid on another claim or line.
Some procedures and tests are made of separately billable parts, such as a technical and a professional component. If one part was already paid, the payer reduces what it allows for the complete service so the total does not exceed the full procedure's allowance.
The patient is generally not responsible for more than the limit for the basic procedure, so check the group code before moving any balance.
Group codes seen with B10
On a remittance, B10 comes after a group code. These are the ones it is most often reported with:
- CO B10 (Contractual Obligation): The provider's side of the ledger. The reduction comes from the payer contract or a rule the provider has to follow, and the patient normally cannot be billed for it.
The payer chooses the group code for each adjustment, so the same reason code can appear with another group code on your remittance. Read the two together. More about group codes.
Common causes
- Another provider or facility already billed the technical or professional component.
- The global service was billed after a component was paid separately.
- Duplicate component billing across two claims for the same date.
What to do next
- Find the earlier paid claim or line for the same procedure and date of service.
- Check whether your claim should have carried a component modifier instead of the global code.
- Correct and resubmit with the right modifier if the claim was billed incorrectly.
- Post the reduction as an adjustment if the payment matches the payer's component rules.
Related codes
- B20 (reason code) Service furnished by another provider
- 97 (reason code) Service included in another payment
- 45 (reason code) Charge exceeds the allowed amount
Source
Official wording: X12 Claim Adjustment Reason Codes list. The explanation on this page is our own plain-English wording, not the X12 text.
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