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Claim adjustment reason code

CO-140: Patient identification number and name do not match

CO-140 means: Patient/Insured health identification number and name do not match. The member ID and the name on the claim disagree with the payer’s record.

Read the group code before you act on this

140 is the reason. The CO in front of it is the group code, a separate field on the remittance, and it is the one that decides who owes the money: CO means contractual obligation — the payer says the amount is not billable to anybody, and it is written off unless the denial itself is overturned. You may not bill the patient. What the other group codes mean.

What causes CO-140?

A transposed digit in the member ID at registration
A married or maiden name mismatch against the payer file
The subscriber billed as the patient, or the reverse, on a dependent claim
Suffix handling — Jr, Sr or III present on one record and not the other

How do you fix a CO-140 denial?

Re-run eligibility and copy the name and ID exactly as the payer returns them, not as the patient wrote them on the form
On dependent claims, confirm the subscriber and patient fields are the right way round
Correct and resubmit — this is never an appeal

Can CO-140 be prevented?

Capturing the payer’s own spelling at eligibility rather than the patient’s handwriting removes almost all of these, and it costs nothing.

A denial like this one is the recurring cost that medical billing outsourcing is built to take off your desk — a dedicated seat working the queue instead of it waiting for whoever has a free hour.

Who does this work

A eligibility & benefits verification seat at $1,700 per seat per month works this queue full time, during your business hours, inside your own system. Every call is logged with the payer reference number and the outcome, and every Friday you get it in writing.

What that seat does →

Codes worked the same way

CO-140 is corrected and resubmitted. So are these, which is why a queue sorted by recovery route moves faster than one sorted by code number — the same person, in the same system, with the same evidence to hand, clears all of them in one pass.

CO-16 — Claim lacks information
CO-4 — Modifier and code disagree
CO-11 — Diagnosis and procedure disagree
CO-5 — Wrong place of service
CO-9 — Diagnosis and age disagree
CO-10 — Diagnosis and gender disagree

Specialties that name this among their costliest

These are specialties whose own worst denials include one of this kind. The line under each is the denial they name, quoted from their page so you can see what the link is based on.

Pain Management
Bilateral procedures billed without the correct modifier
Anesthesia
Time units miscalculated from an incomplete anesthesia record
Orthopedics
Modifier 25 denied on an E/M billed the same day as a procedure
Behavioral Health
Telehealth denied for the wrong place-of-service or modifier
Gastroenterology
Screening colonoscopy converted to diagnostic without modifier PT or 33
Dermatology
Modifier 59 on multiple lesion removals rejected as unbundling

What leaving it costs

Working a denied claim costs $57.23 per denied claim in administrative time (source) — before any of it is recovered, and whether or not it ever is.

Payers ultimately pay roughly 90% of claims even while using an initial denial to slow payment (source), so the reason one sits is rarely that nobody knows how to work it. Put your own denial count in.

Questions

What does denial code CO-140 mean?

Patient/Insured health identification number and name do not match. In plain terms: The member ID and the name on the claim disagree with the payer’s record.

What causes CO-140?

A transposed digit in the member ID at registration. A married or maiden name mismatch against the payer file. The subscriber billed as the patient, or the reverse, on a dependent claim. Suffix handling — Jr, Sr or III present on one record and not the other.

How do you fix a CO-140 denial?

Re-run eligibility and copy the name and ID exactly as the payer returns them, not as the patient wrote them on the form. On dependent claims, confirm the subscriber and patient fields are the right way round. Correct and resubmit — this is never an appeal.

Can CO-140 be prevented?

Capturing the payer’s own spelling at eligibility rather than the patient’s handwriting removes almost all of these, and it costs nothing.

Is CO-140 the same as PR-140?

Same reason, different group code. The number 140 is the reason: The member ID and the name on the claim disagree with the payer’s record. The prefix says who carries the amount. CO means contractual obligation — the payer says the amount is not billable to anybody, and it is written off unless the denial itself is overturned. PR-140 is the same reason assigned to patient responsibility — the payer says the amount is owed by the patient, and it is billed to them. Read the prefix before the number: it decides whether you appeal, write off, or bill the patient.

What about the codes next to CO-140?

CO-139 and CO-141 are separate codes and this site does not yet cover them. The authoritative list is the X12 Claim Adjustment Reason Codes at x12.org/codes/claim-adjustment-reason-codes; a code is only described here once its official text, causes and fix have been written and checked.

Code descriptions are the standard X12 claim adjustment reason and remittance advice remark code text. Payer policies differ, and the payer’s own coverage policy governs any individual claim. This page is working guidance, not legal or clinical advice.

Last updated 2026-09-14. This is operational guidance drawn from payer remittance practice, not legal, coding or reimbursement advice. Payer-specific rules vary and change; confirm against the payer’s own policy before acting on a specific claim.

Written by Ibtesam Asif · Last updated 2026-09-14

Code descriptions are the standard published text. Everything after them is operational guidance on how the work is done, and payer policy governs any individual claim.

Other denial codes

Next step

Is CO-140 one of the denials costing you most?

Send a ninety-day denial report and an aged AR summary, with no patient identifiers. Within two working days you get a written summary of which denial reasons are costing you most and what is recoverable.

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Or write to ops@softhomeglobal.com