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N750 Remark Code: Incomplete Blood Gas Report

N750 means the payer received a blood gas report but found it incomplete or invalid. On oxygen claims this typically means the report lacks a detail the coverage policy requires, such as the test date, testing conditions, or who performed it.

Quick facts

Code
N750 (RARC N750)
Status
Active In use since March 1, 2015.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The supplier or provider bears the adjustment until a valid report is supplied.
Official description
Incomplete/invalid Blood Gas Report.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What N750 means

N750 means the payer has a blood gas or oxygen test report but cannot use it to establish coverage. Oxygen policies are detailed: they often care not only about the result but also about when, how, and by whom the test was done. A report missing any of those elements can trigger N750.

It usually appears with CARC 251 or CARC 272. Suppliers receive it most, though the fix often depends on the lab or physician office that ran the test.

Common causes

  • The report shows a value but not the date or testing conditions.
  • The test was performed by an entity the payer does not accept, such as the oxygen supplier.
  • The test was done while the patient was on supplemental oxygen, without that being noted or allowed.
  • The test date falls outside the payer’s window relative to the order or certification.
  • The report is a handwritten transcription rather than the source result.

How to fix it

  1. Compare the report with the payer’s oxygen coverage policy to find the missing or invalid element.
  2. Request the complete source report from the lab, hospital, or physician office.
  3. If the test itself does not qualify, work with the ordering physician on whether new testing is appropriate.
  4. Submit the corrected documentation through reconsideration, referencing the claim.

How to prevent it

Use an intake checklist for oxygen orders that covers test value, date, conditions, and performing entity. Rejecting incomplete reports at intake is far cheaper than chasing them after an N750.

Codes that may appear with N750

  • CO-251 (The attachment/other documentation that was received was incomplete or deficient.): The documentation received was incomplete or deficient.
  • CO-272 (Coverage/program guidelines were not met.): The report did not show the coverage criteria were met.
  • N749 (Missing Blood Gas Report.): No blood gas report was received.
  • M8 (We do not accept blood gas tests results when the test was conducted by a medical supplier or taken while the patient is on oxygen.): The test was rejected because a medical supplier performed it or the patient was on oxygen at the time.
  • N234 (Incomplete/invalid oxygen certification/re-certification.): The oxygen certification or recertification form is incomplete or invalid.
  • N328 (Missing/incomplete/invalid Oxygen Saturation Test date.): The oxygen saturation test date is missing or invalid.

N750 FAQ

What details does a blood gas report need?

Payers commonly look for the result values, test date, whether the patient was at rest, exercising, or asleep, whether the patient was on oxygen at the time, and who performed the test.

Can I fix N750 without a new test?

Often yes, if the original test was valid and only the report was incomplete. Request a complete copy from the lab or facility. If the test itself did not meet policy, a new test may be needed.

Why was a valid-looking test rejected?

The payer may not accept who performed it, when it was done relative to the order, or the conditions of testing. Check the payer's oxygen policy for those rules.