USCIS Code M01S: Signature Not Waived

What the internal USCIS status code M01S means when you find it in your raw case data.

M01S is an internal USCIS status code. If you found it in your raw case data, here is what it means.

What does “Signature Not Waived” mean?

SIGNATURE NOT WAIVED

This is one of hundreds of internal codes USCIS uses behind the scenes. It appears in the raw API data for your case — the public “Check Case Status” page never shows it. The official internal label for code M01S is “Signature Not Waived.”

What should you do?

If you see this code in your raw USCIS case data, it is an internal status marker. Most codes require no action on their own — what matters is where it sits in your overall timeline. A full analysis of your case reads this code in the context of every other event on your file.

What this means for your case

A single status only tells part of the story. Paste your full USCIS case data and we read “Signature Not Waived” in the context of every other event on your file — including the silent updates the public site hides — and tell you what is likely to happen next.

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Written by the CaseStatusAPI Team

We are immigration applicants and technologists who built CaseStatusAPI to help others navigate the USCIS process with transparency. Our guides are informed by firsthand experience, community feedback, and deep analysis of USCIS internal API data.

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Disclaimer: This content is for educational and informational purposes only. CaseStatusAPI is an independent tool and is not affiliated with, endorsed by, or connected to U.S. Citizenship and Immigration Services (USCIS) or any government agency. For official case information, visit uscis.gov.