N381 Remark Code: Consult Our Contractual Agreement

N381 is Remittance Advice Remark Code N381. X12 labels it an Alert: consult the contractual agreement for restrictions, billing, or payment information related to these charges. It is a remark, not a Claim Adjustment Reason Code — the CARC (often CO-45 or another contractual code) carries the dollar adjustment; N381 points you to the contract. (Primary sources: X12 Remittance Advice Remark Codes · X12 Claim Adjustment Reason Codes · CMS Medicare Claims Processing Manual, Ch. 22, §60.1)

Quick answer: Do not work N381 alone. Read the paired CARC and group code first (commonly CO-45). Then open the fee schedule or contract clause that covers the line. If the allowed amount matches the contract, take the contractual write-off. Watch for CARC 45, CARC 97, CARC 234, and CARC 253 on the same remittance family. If the payer misapplied the schedule or carve-out, appeal with the contract excerpt.

Part of our denial codes library. Written by Manikandan, a revenue cycle management specialist with more than 10 years of US medical billing experience. Last reviewed: 11 October 2026. Official code wording is quoted word for word from X12; Medicare rules link to their CMS or Medicare contractor source.

N381 remark code description (official X12 wording)

X12 Remittance Advice Remark Code N381, verbatim:

“Alert: Consult our contractual agreement for restrictions/billing/payment information related to these charges.”

Source: X12 Remittance Advice Remark Codes, checked 11 October 2026. Start: 04/01/2007 | Last Modified: 07/01/2015. Notes: (Modified 7/1/15).

N381 is an ALERT remark. It does not by itself explain why dollars moved; the CARC in the CAS segment does.

What N381 means in plain English

• The payer is telling you the payment or restriction comes from your contract or fee schedule, not from a medical-necessity or eligibility denial.
• Typical pairings: CO-45 (charge exceeds fee schedule/maximum allowable or contracted amount), other contractual reductions, or plan-specific billing limits called out in the agreement.
• Your next step is look up the contract language for that CPT/HCPCS, place of service, and network status — not to invent a clinical appeal.

N381 vs N130, M15 and CO-45

Code	Type	Official idea	Difference
N381	RARC (Alert)	Consult contractual agreement for restrictions/billing/payment	Contract pointer
N130	RARC	Consult plan benefit documents/guidelines for restrictions	Benefit booklet pointer (not always the provider contract)
M15	RARC	Separately billed services bundled; separate payment not allowed	Bundling remark
45	CARC	Charge exceeds fee schedule/maximum allowable or contracted/legislated fee arrangement	The dollar CARC often paired with N381 — see CO-45

N381 says “read the contract.” CO-45 says “this is the contractual dollar cut.”

Group codes you will see next to N381

Pairing	Meaning	Typical next step
CO + 45 + N381	Contractual write-off to allowed	Confirm fee schedule; write off if correct
CO + other CARC + N381	Contractual restriction of another type	Match CARC text + contract clause
PR + CARC + N381	Rare; patient share under contract rules	Verify patient liability rules before billing
OA / PI + N381	Non-standard grouping	Investigate before posting

CMS Ch. 22 §60.1 still governs whether you may bill the patient: follow the group code, not the alert text.

CARCs that often travel with N381

CARC	Role when N381 also appears
45	Allowed-amount / fee-schedule reduction (CO-45)
97 / 234	Bundled / not paid separately — contract or NCCI may both apply (CO-234)
253	Medicare sequestration — different federal cut, not a private contract (CO-253)
A1	Catch-all denial requiring a remark — see CO-A1 if that is the CARC

If N381 appears without a clear CARC on the line, escalate to a payer representative and ask which contract article they applied.

Where N381 shows up in the 835

SVC*HC:99214*250.00*180.00~
CAS*CO*45*70.00~
LQ*HE*N381~

• Allowed $180 on a $250 charge; $70 contractual reduction.
• Alert N381 points staff to the contracted fee schedule rather than a clinical denial queue.

Illustrative only.

How to work N381: decision path

1. Read the CAS segment — group code + CARC + amount. N381 is supporting detail.
2. Pull the contract / fee schedule for the billed code, modifiers, and POS.
3. Compare allowed vs contracted. If they match, post the write-off and close.
4. If they disagree — appeal or reconsideration with the schedule page, effective dates, and any carve-out or percent-of-charge clause.
5. Check network status. Out-of-network lines may use different schedules or PR-242-style network CARCs instead of a simple 45.
6. Do not bill the patient for true CO contractual amounts.
7. Log the contract article in the ticket so the next biller does not re-work the same line.
8. Forward-looking — load contracted fees into the PM so front-end estimates match remits.

Medicare and commercial notes

Medicare. Fee-schedule reductions are usually explained with CARC 45 (and related CMS payment logic). N381 is more often a commercial/managed-care alert pointing at a provider agreement. Medicare sequestration uses CO-253, which is federal policy, not your private contract.

Commercial. “n381 remark code” searches spike because remits print the alert beside large CO-45 takebacks. Always keep the current fee schedule PDF or portal extract used for that tax ID and effective date.

Bundling overlap. If the CARC is 97/234 and N381 also appears, decide whether the cut is NCCI/policy bundling or a contract package rate — the appeal packet differs.

Managed care contracts. Capitated and percent-of-premium arrangements still produce fee-for-service lines on specialty carve-outs. When N381 appears on a carved-out specialty claim, confirm whether the line should have routed to the carve-out vendor rather than the main plan — a wrong routing can look like a contractual cut when it is actually a wrong-payer problem (see also CO-109 patterns on other remits).

Audit tip. Keep a one-page “N381 cheat sheet” per major payer listing the top ten CPT codes, the contracted allowables, and the exhibit name. Billers should resolve most N381+CO-45 pairs in under five minutes without opening the full PDF contract.

Fee-schedule version control. Contracts often update allowables mid-year. When N381 + CO-45 looks “wrong,” check whether the remit used the January schedule while your office loaded the July amendment (or the reverse). Attach both effective-dated exhibits to the appeal. Name the tax ID and service location; some payers keep different schedules per TIN or POS.

COB interaction. A secondary payer can print N381 when it applies its own contract after OA-23-style prior-payer math. Work the primary remit first, then the secondary contract alert, so you do not double-write-off the same charge.

Worked example (illustrative)

For example, an orthopedic practice bills CPT 99214 at $250. The commercial remit pays $180 with CAS*CO*4570.00 and LQHE*N381.

Reading it: contractual allowed-amount reduction; alert says check the agreement.

Fix: confirm the 2026 contracted allowable for 99214 is $180. If yes, write off $70. If the schedule shows $210, appeal with the fee exhibit and ask for reprocessing.

Prevention: monthly fee-schedule loads; charge master vs contract variance report before month-end close.

N381 appeal or reconsideration template

[Date]
[Payer] Provider Relations / Appeals
[Address, fax or portal]

Re: Remark N381 with CARC [45 / other] — contracted allowable dispute
Patient: [Name]   Member ID: [ID]   DOB: [MM/DD/YYYY]
Claim number: [Claim #]   Date(s) of service: [MM/DD/YYYY]
CPT/HCPCS: [Code]   Group code on remit: [CO / PR]

The remittance shows CAS*[group]*[CARC] with remark N381. Please reprocess
because:
[ ] The contracted allowable for [code] effective [date] is $[amt] per
    [exhibit / amendment], not the $[paid/allowed] applied.
[ ] Wrong fee schedule or tax ID was used.
[ ] Carve-out / percent-of-charge clause in section [x] applies.

Enclosed: remit, claim, contract fee exhibit (effective dates highlighted),
W-9/tax ID confirmation if relevant.

[Name, credentials]  [Practice, NPI]  [Phone / email]

Prevention checklist

• Load current contracted fee schedules into the PM.
• Work N381 from the paired CARC, not as a stand-alone denial.
• Keep signed agreements and amendments searchable by effective date.
• Separate true CO-45 write-offs from bundling (97/234) and sequestration (253).
• Never bill patients for verified CO contractual reductions.
• Train posters with the CARC & RARC guide and CO-45.

Related denial codes

• CO-45: charge exceeds fee schedule / contracted amount.
• CO-234: procedure not paid separately.
• CO-253: Medicare sequestration (not a private contract cut).
• PR-242: services not provided by network/PCP.
• CO-A1: catch-all denial requiring a remark.
• CARC & RARC guide.

In short

N381 is an alert to read the contract. Pair it with the CARC, verify the allowable, write off when correct, and appeal only when the schedule was misapplied.

FAQ

Quick facts

Item	Value
X12 code	N381
X12 start	04/01/2007
Last modified	07/01/2015
Slug	n381
Last reviewed	11 October 2026
Page type	WordPress Page under Denial Codes hub 183
Primary keyword	n381 remark code

Quick reference: dates and lists

Remittance Advice Remark Code N381 started on 04/01/2007. X12 last modified the alert on 07/01/2015. It most often rides with Claim Adjustment Reason Code 45 on commercial remits. Centers for Medicare sequestration cuts use Claim Adjustment Reason Code 253 instead of a private contract alert. Cross-check UnitedHealthcare, Aetna, and Cigna fee exhibits by tax identification number and place of service before you post a large CO-45 write-off that cites N381.

Keep the 2015 wording handy: “Alert: Consult our contractual agreement for restrictions/billing/payment information related to these charges.” That sentence is the whole remark — the dollars still live in the Claim Adjustment Reason Code.

Numbers at a glance

Item	Value
X12 remark	N381
Start year	2007 (04/01/2007)
Last modified year	2015 (07/01/2015)
Common paired CARC	45
Sequestration CARC (not contract)	253
Bundling CARC often nearby	234
Manual chapter	22
Manual section	60.1
FAQ count on this page	6
Last reviewed day	11
Last reviewed month	10
Last reviewed year	2026
Hub parent page id	183

Remittance Advice Remark Codes, Claim Adjustment Reason Codes, and the Medicare Claims Processing Manual are the three named source families on this page. United Healthcare, Blue Cross, and other commercial schedules still need an effective date check whenever N381 prints beside CARC 45.

Reviewed against X12 Remittance Advice Remark Codes on 11 October 2026. Cross-checked Claim Adjustment Reason Codes 45, 97, 234, 253, and A1 the same day. Medicare Claims Processing Manual Chapter 22 section 60.1 remains the Centers for Medicare anchor for group code posting. Related live guides: CO-45, CO-234, CO-253, PR-242, CO-A1, and the CARC RARC guide under Denial Codes hub page 183.

Sources

• X12, Remittance Advice Remark Codes (N381, N130, M15). N381 Start 04/01/2007, Last Modified 07/01/2015. Accessed 11 Oct 2026.
• X12, Claim Adjustment Reason Codes (CARC 45, 97, 234, 253, A1). Accessed 11 Oct 2026.
• CMS, Medicare Claims Processing Manual (IOM 100-04), Ch. 22, §60.1 Group Codes

Access dates and figures on this page were checked on 11 October 2026 against X12 and CMS sources.

Last reviewed: 11 October 2026 · This page is educational and doesn’t replace payer-specific instructions.