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N58 Remark Code: Invalid Patient Liability Amount

N58 means the patient liability amount on the claim was missing, incomplete, or invalid. Some programs, especially Medicaid for long-term care, require the facility to report the amount the patient must contribute, and the payer reduces its payment by that amount.

Quick facts

Code
N58 (RARC N58)
Status
Active In use since January 1, 2000; last modified February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim is denied or held for a correctable billing error. The provider must fix the reported amount.
  • PR (Patient Responsibility): Once processed correctly, the patient's liability amount is assigned to the patient and collected by the provider.
Official description
Missing/incomplete/invalid patient liability amount.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N58 means

In many Medicaid long-term care programs, residents contribute part of their income toward the cost of care. The facility collects that contribution and reports it on the claim, and Medicaid pays the rest. N58 says the amount reported did not work for the payer: it was absent, incomplete, or did not match the payer’s records for the resident and period.

N58 usually appears with CARC 16. When processed correctly, the resident’s share typically shows as CARC 142 (monthly Medicaid patient liability).

Common causes

  • The facility did not receive or did not record the latest liability notice from the state.
  • The amount on the claim did not match the amount in the state’s eligibility system.
  • The liability amount was omitted because staff assumed it was zero.
  • The claim covered part of a month and the amount was not prorated as required.
  • The resident’s income changed and the liability was redetermined.

How to fix it

  1. Check the state’s eligibility system or latest notice for the liability amount in effect for the billing period.
  2. Reconcile it with your records of what the resident owes and has paid.
  3. Correct the amount on the claim using the value code or field the state specifies.
  4. Submit a corrected institutional claim following the program’s replacement process.
  5. Update the resident’s account so statements reflect the correct liability.

How to prevent it

Verify each resident’s liability amount monthly before billing, and set alerts for redeterminations. Keep copies of state notices in the resident’s financial file. Coordinating with the resident’s representative on income changes helps you catch updates early.

Codes that may appear with N58

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): Required information is missing; N58 identifies the patient liability amount.
  • PR-142 (Monthly Medicaid patient liability amount.): The monthly Medicaid patient liability amount, the adjustment N58 relates to.
  • CO-178 (Patient has not met the required spend down requirements.): The patient has not met a required spend-down, a related Medicaid cost-sharing concept.
  • N246 (State regulated patient payment limitations apply to this service.): State-regulated patient payment limitations apply to the service.
  • N43 (Bed hold or leave days exceeded.): Bed hold or leave days were exceeded on a long-term care claim.

N58 FAQ

Where does the patient liability amount come from?

The state Medicaid agency typically determines it based on the resident's income and allowable deductions, and communicates it to the facility. It can change when the resident's income or circumstances change.

Where is it reported on the claim?

Institutional claims usually report it with a value code on the UB-04 or in the corresponding amount field on the 837I. Check your state Medicaid billing manual for the exact code and rules.

What if the amount changed mid-month?

Follow the state's instructions. Some require the amount in effect for the billing period, and some require separate claims when the liability changes.