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Provider Handbook: Overpayments

This is part of the MassHealth Provider Handbook

If providers identify overpayments based on a cost report, they must report it to MassHealth in writing and return any overpayments within 60 days after identifying them.

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Voids 

You can void a claim if you have already submitted it to MassHealth but no longer want it to be paid. You may need to do this if the claim includes erroneous information or was a duplicate request. 

Reasons to request a void (non-dental and non-pharmacy)

  • Payment was made to the wrong provider number.
  • Payment was made for the wrong member.
  • Payment was made for overstated services.
  • Payment was made for services for which full reimbursement has been received from other payers.
Mass.gov page titled "Biling timelines and appeal procedures"

Adjustments

If a provider is paid incorrectly, either underpaid (for which the provider would request more money) or overpaid (for which the provider would return a partial payment), the provider should adjust (replace) the claim. 

An adjustment should only be processed within one year after the date of service. If the claim is more than 12 months old, refer to MassHealth’s billing timelines and appeal procedures for help.

You can also learn more at our MassHealth Claims Information for Direct Data Entry page.

Date published: August 21, 2026

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