The 90 day rule in immigration - changing status after you enter on a B-1/B-2
9 mins read | Sep 15, 2026
Form I-797 is the Notice of Action that USCIS mails to confirm something has happened with your case, whether that's receiving your petition, approving it, or asking for more information. If a letter with "I-797" in the corner just landed in your mailbox, this guide explains what each version means, what triggers it, and what you actually need to do next.
The reason Form I-797 causes so much confusion is that it isn't one document. USCIS uses several versions, each with a letter suffix, to communicate different actions on different types of cases. Knowing which one you're holding tells you whether you can relax, take action, or hold onto the notice as proof of your status.
What is Form I-797, the Notice of Action?
Form I-797 is the official notice USCIS uses to communicate decisions and updates on immigration petitions and applications. It is not something you file. Instead, USCIS generates it and sends it to you, your employer, or your attorney to confirm an action on a case, such as a petition filed on Form I-129 for a work visa or Form I-140 for an employment-based green card.
Every I-797 identifies the case it relates to, the type of action taken, and the people involved. Depending on the version, it might confirm that USCIS received your filing, that your petition was approved, that biometrics are scheduled, or that more evidence is needed before a decision.
Because the notice serves as your paper trail with USCIS, you should keep every I-797 you receive. Approval notices in particular function as legal proof of status or eligibility, and you'll often need to present them when you travel, start a job, or file your next application.
The types of Form I-797: I-797, I-797A, I-797B, and I-797C
The letter after "I-797" tells you what kind of action the notice reports, and the differences matter for what you can do with it. The base Form I-797 and its variants cover everything from a simple receipt to a full approval, so it's worth knowing them apart.
I-797 and I-797A approval notices
The original Form I-797 is an approval notice issued for certain petitions and applications, confirming that USCIS granted the requested benefit. The I-797A is the version that matters most if you're already in the United States, because it approves your petition and includes a replacement Form I-94 at the bottom of the notice.
That attached I-94 is the important part. It's the record that grants or extends your authorized stay, and it shows the new dates of your status. When you change or extend status from inside the country, the I-797A is what proves you're lawfully present, which is why our guide to the I-94 form treats it as a core status document.
I-797B approval notice for consular cases
The I-797B is an approval notice issued when the approved beneficiary will get their visa abroad rather than adjusting status inside the United States. Unlike the I-797A, it does not contain a replacement I-94, because the person isn't receiving status from within the country.
If you see an I-797B, it generally means USCIS approved the petition and notified a consulate, and your next step is consular processing. The notice itself doesn't grant status. It confirms approval so you can move forward with the visa interview abroad.
I-797C, the receipt and action notice
The I-797C is the workhorse of the family, used for a wide range of actions that aren't full approvals. USCIS issues an I-797C to confirm it received your filing, to reject a submission, to transfer a case to another office, to reopen a case, to acknowledge a fee, or to schedule a biometrics appointment.
Most people first meet the I-797C as a receipt notice shortly after filing, since it confirms USCIS has your case and assigns the receipt number you'll use to track it. Separately, when USCIS needs more from you, it may send a Request for Evidence on Form I-797E, which asks for additional documents before a decision; our guide to USCIS Requests for Evidence walks through how to respond.
| Notice | What it means | Contains an I-94? | Typical next step |
|---|---|---|---|
| I-797 | Approval notice for certain petitions | No | Keep as proof of approval |
| I-797A | Approval with status granted inside the U.S. | Yes | Keep the attached I-94 |
| I-797B | Approval where the visa is issued abroad | No | Begin consular processing |
| I-797C | Receipt, rejection, transfer, reopening, fee, or appointment | No | Track the case or attend the appointment |
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Where to find the receipt number on your I-797
Your receipt number is the 13-character code printed near the top of the notice, and it's the key to tracking your case. It's made up of three letters followed by ten digits, such as "WAC2212345678" or "IOE0912345678," where the first three letters identify the USCIS service center or system handling your filing.
You'll use this number every time you check on your case, so it's worth copying it down as soon as your receipt notice arrives. With it, you can look up where your petition stands on the official USCIS case status page, which our guide to checking your USCIS case status explains step by step.
Keep in mind that the receipt number is specific to a single filing. If you file more than one application, each gets its own number, so the receipt number on one I-797 won't match the one on another even when both relate to your case.
What to do when you receive an I-797 notice
What you do with a Form I-797 depends entirely on which version you've received, so start by reading the action type printed on the notice. An approval notice calls for very different steps than a request for more evidence, and missing a deadline on the latter can cost you the case.
For a straightforward approval such as an I-797 or I-797A, the main task is to keep it safe and use it where required. An I-797A approving a work petition filed on Form I-129 lets you keep working under your extended status, while an approved Form I-140 immigrant petition moves you forward in the green card process. If you receive an I-797C receipt notice, no action is usually needed beyond saving the receipt number for tracking.
The notices that require action are appointment notices and evidence requests. A biometrics appointment notice tells you when and where to appear, and skipping it can delay or deny your case. A Request for Evidence sets a firm deadline to submit documents, and USCIS will decide on the record if you don't respond in time. When the stakes are this high, many applicants ask an immigration attorney to review the notice before responding. You can confirm what each notice type means on the official USCIS filing guidance page.
Form I-797 and your I-94: why the difference matters
The link between Form I-797 and your I-94 is the single most important thing to understand about these notices, because it determines whether you're lawfully present. Only the I-797A carries a replacement I-94 with new status dates, so it's the version that actually proves and extends your authorized stay inside the United States.
This distinction trips people up during travel and job changes. An I-797B confirms an approval but grants no status, since the visa is issued abroad, and an I-797C receipt notice simply acknowledges a filing. Relying on the wrong notice as proof of status can lead to problems at the airport or with an employer's verification, so check which version you hold before treating it as evidence of your right to stay or work.
Tukki is a U.S. immigration provider focused on employment-based visas and green cards, from H-1B specialty occupation petitions filed on Form I-129 to EB-1A and EB-2 NIW cases, with dedicated attorney support and full case visibility from receipt notice to approval. If an I-797 has you unsure of your next move, our team can read it with you and map out what comes next.