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MA30 Remark Code: Missing or Invalid Type of Bill

MA30 means the type of bill on an institutional claim is missing, incomplete, or invalid. The type of bill tells the payer what kind of facility billed, the care setting, and whether the claim is original, interim, or a replacement, so the payer cannot route it without a valid one.

Quick facts

Code
MA30 (RARC MA30)
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 facility must fix the claim. The patient is not responsible for a claim returned for a coding error on the bill type.
Official description
Missing/incomplete/invalid type of bill.
X12 Remittance Advice Remark Codes, retrieved September 25, 2026
Last verified
against the official X12 list.

What MA30 means

The type of bill (TOB) is a short code at the top of every institutional claim. Its digits identify the facility type (such as hospital or skilled nursing), the bill classification (inpatient, outpatient, and so on), and the claim frequency. Payers use it to decide which payment system and edits apply. MA30 means the TOB was blank, too short, or used a combination the payer does not recognise.

Because it drives routing, a bad TOB usually stops the claim before any service line is reviewed.

Common causes

  • The TOB was left blank or entered with only three digits where the payer expects four including a leading zero.
  • The facility and classification digits do not form a valid combination.
  • A replacement or void frequency code was used without the original claim number.
  • The TOB does not fit the provider’s enrollment, such as billing an outpatient type from an inpatient-only setup.

How to fix it

  1. Check form locator 4 or the 837I claim frequency and facility codes.
  2. Confirm the correct TOB for the setting and the claim’s purpose using the payer’s billing manual.
  3. Add the original claim number if you are replacing or voiding a prior claim.
  4. Resubmit the corrected claim through your usual channel.

How to prevent it

Build TOB defaults into each department’s billing profile and prevent manual overrides without review. A Claims Validator can catch invalid TOB combinations before submission. Header-level problems like this are often rejections rather than denials; see claim rejection vs. denial.

Codes that may appear with MA30

  • CO-16 (Claim/service lacks information or has submission/billing error(s).): The claim is missing or has invalid information, and MA30 identifies the type of bill.
  • CO-282 (The procedure/revenue code is inconsistent with the type of bill.): The procedure or revenue code does not fit the type of bill that was reported.
  • MA31 (Missing/incomplete/invalid beginning and ending dates of the period billed.): The statement period dates are missing or invalid, another header field on the same claim.
  • MA43 (Missing/incomplete/invalid patient status.): The patient discharge status is missing or invalid, which must agree with the bill type frequency.
  • CO-135 (Interim bills cannot be processed.): Interim bills cannot be processed, a related issue with the frequency digit.

MA30 FAQ

Where does the type of bill go?

On the UB-04 it is form locator 4. On an 837I electronic claim it is built from the facility code, the facility code qualifier, and the claim frequency code in the CLM segment.

What does the last digit mean?

It is the frequency code. For example, 1 is an admit-through-discharge claim, 7 is a replacement of a prior claim, and 8 voids a prior claim.

Can the wrong bill type cause other denials?

Yes. A bill type that does not match the services or setting can lead to revenue code or payment method mismatches, even if MA30 itself is not reported.