How to Submit a Corrected or Voided NEMT Claim in 2027: Codes, Deadlines, and Duplicates

Sooner or later every NEMT company bills a trip wrong. The loaded miles are off by three, a modifier is missing, or the return leg never made it onto the claim. The right fix depends on what the payer already did with the claim. Send the wrong kind of correction and it denies as a duplicate or as late, even when the trip was real.

Correct, replace, void, or rebill: which one you need

Start with the status on your remittance advice. A claim is in one of five places, and each one takes a different fix.

What happened to the claim	What to send	Examples from state rules
Rejected before processing, for example on a 277CA response report	A new claim with the error fixed, sent as an original (code 1 on an 837P, box 22 blank on paper)	Texas lets you resubmit an electronic claim rejected on the 277CA within 95 days of the date of service
Denied	In many states, a new claim. In Arizona, a replacement.	New York leaves the adjustment field blank for a denied claim. Utah says a denied claim goes back as a new original claim.
Paid, but something on it was wrong	A replacement (frequency code 7) of the whole claim, with the payer’s claim number	Wrong units or miles, wrong date, missing modifier, a leg left off
Paid, but it never should have been billed	A void (frequency code 8), then a new claim if the trip is billable	The rider’s other insurance paid in full, or the rider’s Medicaid ID was wrong
Billed to a broker	The broker’s portal, appeal, or void process	MTM Health in Virginia uses its claims portal for appeals and your Field Monitor for voids

Payers use different words for the same thing. New York calls a replacement an adjustment, and its ePACES screen calls it a replacement. Indiana calls both voids and replacements claim adjustments. Medi-Cal uses a Claims Inquiry Form for adjustments and for reconsideration of denied claims. Read your payer’s word as “replace this claim” or “cancel this claim,” then follow its steps.

If the payer made the mistake and your claim was right, a correction is the wrong tool. Ask for reconsideration or appeal instead. See how to appeal a denied Medicaid claim.

The codes: frequency 7 and 8 and the original claim number

A corrected claim needs two things the first claim did not have: a frequency code and the payer’s number for the claim you are fixing.

On the CMS-1500 paper claim. Box 22 is “Resubmission and/or Original Reference Number.” The NUCC instruction manual, version 13.0 from July 2025, says to put the frequency code on the left side of the box and the original reference number on the right. The code area holds 11 characters and the reference number area holds 18. The box is not for first claims.

Code	Meaning	When a NEMT company uses it
1	Original claim	Every first claim. On paper, box 22 stays blank.
7	Replacement of prior claim	A paid claim needs a change, such as more loaded miles or a missing return leg
8	Void or cancel of prior claim	The trip should not have been billed, or the member or billing provider ID is wrong

On the 837P electronic claim. The same code goes in CLM05-3, the claim frequency code. With a 7 or an 8, the payer’s claim number goes in the loop 2300 REF segment with the qualifier F8. Utah’s fee-for-service companion guide (July 19, 2024) spells it out and adds two rules many payers share: only paid claims can be adjusted or voided, and the billing provider NPI must match the original claim.

Payer letters. Some payers take letters as well as numbers. Arizona accepts A or 7 to replace a CMS-1500 claim and V or 8 to void one. New York’s paper form has an A box for an adjustment and a V box for a void in field 6, with the claim number in field 6A.

Where to find the payer’s claim number

The number comes from your remittance advice or the payer’s portal, not from your own records. Each payer names it differently:

Payer	Name of the number	Notes
Arizona AHCCCS fee-for-service	Claim Reference Number (CRN)	Goes in “Original Ref. No.” in box 22
New York eMedNY	Transaction Control Number (TCN)	16 digits
Indiana fee-for-service	Internal control number (ICN), also called the Claim ID	Always use the most recent one
Utah Medicaid	PRISM Transaction Control Number (TCN)	17 or 18 digits

Use the latest number. Indiana adjusts only the most recent paid claim, so if a claim was already adjusted once, the newest Claim ID is the one to reference. Arizona warns that a replacement without the CRN in box 22 is processed as a new claim and can deny as late or as a duplicate.

How long you have to correct a NEMT claim

Correction windows are not the same as first filing limits, and they start from different dates. Some run from the date of service, others from the date on the remittance.

Payer	First claim due	Fix a denied claim	Fix a paid claim	Void or return money
Arizona AHCCCS fee-for-service (Chapter 4, revised November 3, 2025)	6 months from the date of service	Replacement with the CRN. The claim must reach clean claim status within 12 months of the date of service.	Replacement with every line, within 12 months of the date of service	V or 8 with the CRN. Send only the lines to void.
Indiana fee-for-service claims at Gainwell (module published January 29, 2026). Brokered NEMT trips go to Verida instead.	180 days from the date of service	A new claim, held to the 180-day limit	Replacement within 60 days of the remittance date. A new line added to it must meet the 180-day limit.	Any time
New York eMedNY (General Billing, June 9, 2025)	90 days from the date of service	Corrected and resubmitted within 60 days of the notice	Adjustment within 60 days of the notice	A resubmission after a void is a new claim under the two-year rule
Ohio Medicaid (rule effective February 1, 2023)	365 days from the date of service	Resubmitted within 365 days of the date of service	Underpayments adjusted within 365 days of the date of service	Electronic adjustment within 60 days of finding an overpayment
Texas Medicaid at TMHP, including the Medical Transportation Program (September 2026)	95 days from the date of service for in-state providers	Appeal within 120 days of the remittance date. A zero-paid claim still inside 95 days goes back as a new claim.	Adjustment request within 120 days of the remittance date	Refund check, or a recoupment requested through a paper appeal
Medi-Cal fee-for-service (CIF pages updated March 2023)	The six-month billing limit	A new claim inside the six-month limit, or a CIF within six months of the denial date	A CIF for an underpayment within six months of the payment date. Overpayments any time.	An overpayment adjustment on a CIF at any time, or an electronic void

Two rules in that table catch owners off guard. New York says a claim not correctly resubmitted within 60 days, or still not payable after the second resubmission, is no longer valid or enforceable. Arizona locks three fields on a replacement: the service provider ID, the billing provider ID, and the tax ID. To change one, void the claim and send a new one inside the 6-month limit.

Texas adds one more. It does not take an electronic appeal that changes the quantity billed, such as loaded miles. Send a mileage correction through TMHP’s Automated Inquiry System at 800-925-9126, or on paper. For the first filing limits in more states, see Medicaid timely filing limits.

How to submit a corrected NEMT claim, step by step

1. Read the remittance line. Note the status, the adjustment reason and remark codes, and the payer’s claim number. See how to read remittance advice.
2. Pull the trip record. The correction must match the trip log: pickup and drop-off addresses, times, loaded miles, and the rider’s signature. Never change a claim to something your records do not show. See NEMT trip documentation.
3. Choose the fix. Use the table at the top: new claim, replacement, void, broker process, or appeal.
4. Check the clock. Find your payer’s window and the date it runs from.
5. Rebuild the whole claim. A replacement repeats every line, including the ones that paid. Arizona recoups any paid line you leave off, and an adjustment that adds charges must list the original charges plus the new ones.
6. Mark it. Put 7 or 8 in box 22 or CLM05-3, and the payer’s claim number in “Original Ref. No.” or the REF F8 segment.
7. Attach the documents again. Arizona images each claim on its own and cannot pull papers from the earlier version, so the Daily Trip Report goes with every NEMT replacement.
8. Send it the way the payer wants. Ohio takes claim adjustments only through EDI or its web portal. Indiana’s portal has Edit and Void buttons on each paid claim. Medi-Cal says an electronic void and resubmission may fix the problem without a paper CIF.
9. Track the result. On a Texas remittance, the adjusted claim prints first with explanation code 00123, and a receivable for the original payment comes out of future payments. Indiana says to call 800-457-4584 if an adjustment is not on your remittance after 45 days.
10. Log it. Record the old and new claim numbers, the reason, and the date sent in a claim denial log.

A worked example from Arizona’s manual

Arizona’s manual shows how a replacement pays. You bill two units at $50 each and are paid $100. Then you find three units should have been billed. You replace the claim with three units and $150 in charges. AHCCCS allows $150, subtracts the $100 already paid, and pays you $50.

If you had billed only the one extra unit at $50, AHCCCS would treat $50 as the new total and take back $50 of the $100 already paid. The same math applies to a mileage line on a NEMT claim. Always bill the full corrected total.

How to avoid duplicate-claim denials

Federal rule 42 CFR 447.45 requires every state to check, before paying, that a claim does not duplicate or conflict with one it already reviewed or is reviewing. The standard remittance code for an exact duplicate is claim adjustment reason code 18, “Exact duplicate claim/service,” used with the group code OA.

Texas defines a duplicate as a claim or line that exactly matches one already paid to the same provider for the same client: same date of service, procedure code, modifier, and number of units. It adds that modifiers may be used to identify separate services. That is one reason the origin and destination modifiers on each leg matter.

A second claim for a trip that belongs on the first one is a duplicate waiting to happen. Arizona requires every trip for the same member on the same day on one claim: the total trips on line 1, the total loaded miles on line 2, and wait time on line 3. Any additional lines deny, a base-rate claim and a separate mileage claim deny as split billing, and a second claim for the same date denies as a duplicate. If you forgot the return leg, replace the day’s claim with both legs on it.

Indiana works the same way for base rate and mileage, or wait time and mileage, which must be billed together. If one line paid and the other denied, you send an adjustment for the denied line, not a new claim.

These habits keep duplicate flags off your remittance:

• Never resend a claim that is still processing. Texas says to wait for a claim to appear on your weekly remittance report and to resubmit only if it has not appeared within 30 days, still inside the 95-day limit. Medi-Cal says not to send a CIF for a claim shown as suspended. See how to check Medicaid claim status.
• Fix the original, do not copy it. A resubmission with no change is a duplicate. A replacement with code 7 and the claim number is not.
• Keep one claim per rider per day where your state requires it, and put every leg on it.
• Watch your broker scorecard. MTM Health’s Virginia handbook holds providers to under 0.99 percent overlapping claims (one driver in two vehicles, or two drivers in one vehicle, at the same time), under 0.99 percent of paid claims with missing or wrong information, and under 0.29 percent of claims denied.

Correcting claims billed to a broker

Brokers pay by their own trip ID, in their own system, and each contract sets the rules. Fix the trip through the broker’s portal or appeal process unless its manual says otherwise.

Broker and document	Deadline to bill	How to fix a claim
MTM Health, Virginia Medicaid fee-for-service (handbook approved August 10, 2026)	A clean claim within 6 months of the date of service	Appeal a denial in the online claims portal within 365 calendar days, with the correct information. Call your Field Monitor right away to void a claim sent in error.
MTM Health standard agreement (Pennsylvania copy, January 1, 2023)	90 days after the date of service, or the client’s limit	Appeal denied claims through MTM’s appeals process. MTM recovers overpayments by offset against future payments.
WellTrans, Indiana (agreement revised October 16, 2025)	60 days after the date of service. Invoices more than 90 days after it are disallowed.	Resubmit a claim denied for missing information with the missing details. WellTrans offsets duplicate payments and overpayments against future payments.

MTM’s Virginia handbook also lists what makes a claim clean: an electronic trip log with the trip ID, scheduled and actual pickup times, departure and arrival times, and the member’s signature, with the trip in completed status. A claim missing any of them is denied, so check those items first when you fix an MTM claim. For each broker’s billing steps, see how to bill NEMT brokers.

When you find an overpayment: void, adjust, and report

Money paid for a trip that did not happen, or paid twice, is an overpayment. Under federal law, 42 U.S.C. 1320a-7k(d), you must report and return it, in writing with the reason, within 60 days after you identify it, or by the date a related cost report is due if that is later. An overpayment kept past that deadline counts as an obligation under the False Claims Act.

States tell you how to return it:

State	How to return an overpayment
Arizona	Void the claim to return the full payment, or send a correction claim for part of it. There is no time limit to identify and refund one. Do not send a check, because that can cause a duplicate recovery.
Indiana	An overpayment adjustment is not held to filing limits. After the 180-day limit, add the claim note “Adjustment due to overpayment. Timely filing does not apply.” System errors, possible violations, and totals over $1,000 go on Indiana’s Voluntary Self-Disclosure of Provider Overpayments Form instead.
Ohio	Send an electronic adjustment within 60 days of finding it. Ohio processes refund checks only in set cases, such as an invoice or an audit.
Texas	Send a refund check with the Texas Medicaid Refund Information Form, or request a recoupment through the paper appeal process.
New York	Voiding or adjusting a claim does not meet the duty to report and explain the overpayment. New York’s Office of the Medicaid Inspector General points providers to its self-disclosure program.
Medi-Cal	Send an overpayment adjustment on a CIF at any time.

Be careful during an audit. New York’s Medicaid Inspector General says providers must get permission from the investigating agency before voiding or adjusting claims in a review it is already doing. Ask the auditor before you touch any claim in the audit period. See Medicaid audits for NEMT and Medicaid recoupment.

Common mistakes on corrected NEMT claims

• Sending only the changed line. Arizona reads a missing line as “take this money back.”
• Leaving out the claim number. Without it, the correction is a new claim, and it can deny as late or as a duplicate.
• Replacing a denied claim in a state that wants a new one. New York, Utah, and Indiana handle a denied claim as a new submission. Arizona wants a replacement.
• Trying to fix the member ID or your NPI on a replacement. Void the claim and send a new one.
• Voiding when an adjustment would do. New York says to adjust rather than void a paid claim, because a claim sent after a void is treated as brand new and every timely filing edit applies again.
• Correcting a claim the record does not support. A change without a trip log behind it is an audit finding waiting to happen.
• Waiting. New York and Indiana give 60 days from the notice. Set a weekly time to work denials, and see NEMT claim denials for what each code means.