Mass General Brigham Health Plan Timely Filing Limit

Coverage: Massachusetts Mass General Brigham Health Plan; the verified filing guidance is for commercial and MGB ACO billing, not every Medicare, One Care or SCO product.

Mass General Brigham Health Plan filing guidance from the reviewed sources: Commercial/MGB ACO: 90 days from service unless otherwise contractually agreed. Confirm the plan, provider agreement, and event that starts the filing period before submission.

At a glance

• The linked filing guidance requires original claims within 90 days unless the contract states otherwise.

Initial claim filing limits

• Commercial/MGB ACO: 90 days from service unless otherwise contractually agreed.

Corrected claim filing limits

• Not clearly published in the researched sources.

Appeal and reconsideration deadlines

• Review or adjustment of a claim received over the filing limit: within 90 days of the EOP on which the claim originally denied.

Trigger basis and caveats

• This late-filing review period is not a universal corrected-claim period or guarantee of payment. Retain acceptance/rejection and primary insurer evidence. Other products require their own rules.

Provider resources

• Official provider portal (official)
• Official policy source (official)
• Official policy source (official)
• Official policy source (official)

Sources

Update notes

Last updated: 2026-10-30.

• Verified official claims and authorization pages and their linked filing guidance. Limited the 90-day rule to the identified billing scope and retained contract exceptions.
• The filing PDF is hosted on the plan-linked HubSpot document service. Medicare, One Care, SCO and out-of-state employee-plan routes need separate confirmation.