CO 54 denial code
Claim adjustment reason code 54. Often reported as CO 54.
Assistant or extra surgeon not covered
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 54 means
The payer will not pay for more than one physician or for an assistant on this case or procedure.
The payer's rules say this procedure does not need an assistant surgeon, co-surgeon or more than one physician, so the extra provider's line was denied. Each payer keeps its own list of procedures where an assistant is allowed.
Group code CO is typical, so the assistant's charge usually is not billed to the patient. Look for a line level policy reference on the 835; it identifies the edit or policy the payer used.
Group codes seen with 54
On a remittance, 54 comes after a group code. These are the ones it is most often reported with:
- CO 54 (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
- An assistant surgeon modifier was billed on a procedure the payer lists as not allowing an assistant.
- Two surgeons billed the same procedure without co-surgeon modifiers.
- A non-physician assistant was billed with the wrong modifier for the payer.
What to do next
- Check the payer's assistant at surgery and co-surgery policy for the procedure code.
- Make sure the right assistant or co-surgeon modifier was used and send a corrected claim if not.
- Appeal with the operative report when it shows why an assistant was medically needed.
- Coordinate with the other surgeon's office so both claims use matching modifiers.
Related codes
- 4 (reason code) Procedure code and modifier do not match
- 59 (reason code) Multiple or concurrent procedure rules
- 50 (reason code) Not medically necessary per the payer
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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