Medicare Signature Requirements: The Small Detail That Can Cause Big Claim Problems

In medical coding, auditing, and compliance, the small details matter. A missing signature may not seem like a big deal at first, but in Medicare documentation, it can lead to claim denials, delays, and audit issues. That is why providers and compliance teams need to take Medicare signature requirements seriously.
CMS updated its guidance in July 2025 and added information about stamped signatures, artificial intelligence, attestations, and signature logs. These updates are important because documentation is changing, especially with more providers using electronic systems, scribes, and AI tools.
Medicare reviewers look for signed and dated medical documentation from the provider responsible for the patient’s care. If the documentation is not signed properly, Medicare may deny the claim.
A handwritten signature shows that the provider reviewed, approved, or accepted responsibility for the documentation. Medicare usually does not accept stamped signatures unless the provider has a physical disability and can prove they are unable to sign manually.
Electronic signatures are allowed, but the system must have safeguards to protect the record from being changed improperly. The provider is still responsible for the authenticity of the signature and the accuracy of the documentation. One important update involves AI and scribes. If a provider uses a human scribe or AI technology to help create the note, the provider must still review, sign, and date the record. The scribe or AI tool does not need to sign the documentation. The responsibility remains with the
provider.
If a signature is missing from a medical record, an attestation statement may be allowed. However, attestations cannot be used for unsigned orders, and they cannot be used to backdate a plan of care. If a signature is illegible, a signature log can help identify the provider. A signature log lists the provider’s printed name with their handwritten signature. This can be very helpful during an
audit or medical review.
From my experience, these are the kinds of details that can get overlooked until a chart is being reviewed. From a compliance standpoint, this is one of those areas that should not be ignored. A service can be medically necessary and properly performed, but if the signature requirement is not met, the claim can still be at risk.

Reference:
Centers for Medicare & Medicaid Services. Complying with Medicare Signature Requirements.
MLN905364. July 2025.
Centers for Medicare & Medicaid Services. (n.d.). Medicare Program Integrity Manual (Chapter
3, § 3.3.2.4). U.S. Department of Health and Human Services. CMS Medicare Program Integrity
Manual