EOB denial code M15: what it means

What it means

Services that were billed separately were combined (bundled) because the insurer treats them as parts of one procedure, so they are not paid separately.

Official X12 description

“Separately billed services/tests have been bundled as they are considered components of the same procedure. Separate payment is not allowed.”

Typical cause

Bundling rules — the line items are considered components of a single procedure already paid.

What to do next

1. 1This is generally a provider billing matter, not a patient-owed amount.
2. 2If the services were genuinely distinct, your provider can appeal with documentation.