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MA90 Remark Code: Primary Insured Employment Status Invalid

MA90 means the employment status code for the primary insured was missing, incomplete, or invalid. Payers, especially Medicare, use employment status to decide whether a group health plan pays before them.

Quick facts

Code
MA90 (RARC MA90)
Status
Active In use since January 1, 1997; last modified February 28, 2003.
Code set
Remittance Advice Remark Codes (RARC)
Group codes
  • CO (Contractual Obligation): The claim was returned because coordination data was incomplete. The provider supplies it; the patient is not billed.
Official description
Missing/incomplete/invalid employment status code for the primary insured.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What MA90 means

MA90 tells you the employment status of the primary insured was missing or invalid on the claim. For Medicare, this is a key piece of Medicare Secondary Payer (MSP) logic: coverage tied to current employment may pay before Medicare, while coverage tied to retirement generally does not. When the claim does not supply a valid status, the payer cannot finish coordinating benefits and returns it, usually with CARC 16.

Common causes

  • Employment status was never collected because the MSP questionnaire was skipped.
  • The status on the account is stale, for example the insured retired since the last update.
  • The billing system did not send the status for the other subscriber.
  • An invalid or legacy value was selected.

How to fix it

  1. Ask the patient about the primary insured’s current employment status and the source of their group coverage.
  2. Update the MSP information in the account.
  3. Correct the claim with a valid employment status for the primary insured and complete other-payer details.
  4. Resubmit, including the primary payer’s adjudication if this payer is secondary.

How to prevent it

  • Use an MSP questionnaire for Medicare patients as your process requires, and refresh it when coverage or employment changes.
  • Make employment status mandatory whenever a group health plan is listed ahead of Medicare.
  • For broader coordination issues, see eligibility and COB denials.

Codes that may appear with MA90

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim lacks information needed for adjudication, identified by MA90 as employment status.
  • OA-22 (This care may be covered by another payer per coordination of benefits.): Another payer may be primary, and employment status helps determine that.
  • MA89 (Missing/incomplete/invalid patient's relationship to the insured for the primary payer.): The patient's relationship to the primary insured.
  • MA88 (Missing/incomplete/invalid insured's address and/or telephone number for the primary payer.): The primary insured's address or phone number.
  • MA83 (Did not indicate whether we are the primary or secondary payer.): The claim did not state whether this payer is primary or secondary.

MA90 FAQ

Why does employment status matter?

Under Medicare Secondary Payer rules, whether coverage comes from current employment can determine if an employer group health plan pays before Medicare. The status on the claim supports that determination.

What values are used?

Values describe whether the insured is actively employed, retired, or otherwise, and are defined in the claim transaction's implementation guide. Your billing software should present the valid list.

Is a retiree plan primary to Medicare?

Generally retiree coverage pays after Medicare, which is why accurate employment status matters. Confirm specifics with the MSP questionnaire and the payers involved.