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N434 Remark Code: Missing or Invalid POA Indicator

N434 means the Present on Admission (POA) indicator is missing, incomplete, or invalid. On an inpatient institutional claim, each diagnosis generally needs a POA value showing whether the condition was present when the patient was admitted.

Quick facts

Code
N434 (RARC N434)
Status
Active In use since July 1, 2008.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim could not be processed correctly without valid POA data. The facility corrects and resubmits; the patient is not billed.
Official description
Missing/Incomplete/Invalid Present on Admission indicator.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N434 means

Present on Admission (POA) reporting tells a payer whether each diagnosis on an inpatient claim existed when the patient was admitted or developed during the stay. Payers use it to identify hospital-acquired conditions and adjust payment. N434 says the POA data on the claim was missing, incomplete, or not a valid value.

It is an institutional claim issue. On the UB-04, the indicator sits next to each diagnosis code, and electronic 837I claims carry it with each diagnosis. N434 usually appears with CARC 16.

Common causes

  • Blank indicators on one or more secondary diagnoses, often after codes were added late in the coding process.
  • Invalid values, such as a character that is not one of the accepted POA values.
  • Exempt codes handled incorrectly. A diagnosis on the exempt list was given Y or N, or the exempt indicator was used on a code that is not exempt, depending on the payer’s edit.
  • System conversion issues where the POA field did not map from the coding system to the billing system.
  • Missing on the principal diagnosis when the payer requires it there too.

How to fix it

  1. Open the coded abstract and compare each diagnosis on the claim with its POA value.
  2. Assign missing values from the provider’s documentation. Where the record is unclear, query the provider rather than guessing.
  3. Check exempt codes against the current official exempt list.
  4. Resubmit the corrected claim. If the payer processed and denied the original, use a replacement claim (type of bill frequency code 7) with the original claim number; if it was rejected as unprocessable, submit a new claim.

How to prevent it

Make POA a required field in your coding workflow for every inpatient diagnosis, and run a pre-bill edit that stops claims with blank or invalid values. Coders and CDI staff should treat POA queries like any other documentation query.

Codes that may appear with N434

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information needed for adjudication; N434 identifies the POA indicator.
  • CO-A1 (Claim/Service denied.): A general claim denial explained by the POA remark.
  • CO-233 (Services/charges related to the treatment of a hospital-acquired condition or preventable medical error.): Charges related to a hospital-acquired condition, which POA data helps payers identify.
  • N50 (Missing/incomplete/invalid discharge information.): Discharge information is missing, incomplete, or invalid, another inpatient data element.
  • MA130 (Your claim contains incomplete and/or invalid information, and no appeal rights are afforded because the claim is unprocessable.): The claim is unprocessable and must be resubmitted as a new claim with complete information.

N434 FAQ

What POA values are used?

The standard values are Y (present at admission), N (not present), U (documentation insufficient), W (clinically undetermined), and an exempt indicator for diagnoses on the official exempt list. Check the payer's format rules for how exempt codes are reported.

Do all hospitals have to report POA?

Hospitals paid under Medicare's inpatient prospective payment system must report it, and many other payers require it too. Some facility types are exempt from Medicare's requirement, but a payer can still expect POA values.

Can we default every diagnosis to Y?

No. POA must be based on provider documentation. Defaulting values can misstate hospital-acquired conditions and create compliance risk.