USCIS Receipt Number Explained: Prefixes and Processing Times

Life in the USOct 18, 2026 · 7 min read

Every application or petition you send USCIS gets a receipt number. It is the key you use to check status, contact USCIS and compare your wait with official processing times. This guide explains what the letters and digits mean, how to read the common status messages, and what to do when your case seems stuck. To keep several receipt numbers in one place, you can use our free USCIS Case Tracker, which decodes each number and puts it next to the official processing-time data.

Where to find your receipt number

Look at the top left of your Form I-797C receipt notice (or any later I-797 notice for the same case). USCIS describes it as a unique 13-character identifier: three letters followed by ten numbers, for example EAC2190012345. When you type it into Case Status Online, leave out dashes but keep any asterisks printed on your notice. If you filed online, the number also appears in your USCIS online account.

What the three letters mean

The prefix shows which office or intake channel received your case first. USCIS lists these in its Congressional Inquiries Refresher:

One important detail: the prefix marks where the case was received, not necessarily where it will be decided. USCIS moves work between offices to balance workloads, and you may see a "Case Was Transferred" status. Many I-485 cases, for example, end up at a local field office for an interview. When you look up processing times, use the office listed on your most recent notice or status message.

What the ten digits mean (unofficial)

USCIS does not officially document the digits. The widely used community reading for paper-filed (non-IOE) receipts is:

• First 2 digits: the fiscal year the case was received. USCIS fiscal years start October 1, so "26" covers Oct 1, 2025 to Sep 30, 2026.
• Next 3 digits: the workday within that year; a 9 in the first of these positions is commonly read as lockbox or e-filing intake.
• Last 5 digits: a sequence number.

Treat this as a rule of thumb, not a guarantee. It does not apply to IOE numbers. Your received date and form type, both printed on the notice, are what actually matter for processing times.

Common case status messages

Case Status Online shows a short headline and a sentence or two of detail. USCIS does not publish an official list of every headline, but these are the ones most people see:

Status pages only show the latest action. A USCIS online account can show recent history, and keeping your own dated log makes it much easier to spot when a case has stalled.

How official processing times work

On the USCIS Case Processing Times page you choose a form, a category and the office handling your case. USCIS then shows how long it took to complete 80% of adjudicated cases of that type at that office over the past six months. So the number is closer to "most people were done by" than "the average wait," and USCIS calls these times a reference point, not a promise for any single case.

The page also gives a receipt date for a case inquiry. If the received date on your notice is earlier than that date, your case is considered outside normal processing time and you can ask USCIS about it.

For a national picture, USCIS also publishes quarterly reports with median processing times (the point by which half of completed cases were done). From the April to June 2026 report (FY2026 Q3):

Medians and the office-level 80% figure measure different things, so expect your office's number to be longer than the national median. Some forms, such as I-140 and certain I-129 and I-765 categories, can be sped up with premium processing (Form I-907); for most I-140 categories USCIS acts within 15 business days, and within 45 for EB-1C and National Interest Waiver cases.

When to submit an inquiry

1. Look up your form, category and current office on the processing times page.
2. If your received date is earlier than the "receipt date for a case inquiry," submit a "case outside normal processing times" request through USCIS e-Request. If it is not, the tool will tell you when you can.
3. Do not inquire about a brand-new filing. USCIS asks people to wait at least 60 days after filing before inquiring about a recent case.
4. If e-Request does not help, the USCIS Contact Center is at 800-375-5283. Persistent problems can be raised with your member of Congress's office, which has its own USCIS liaison channel.

Also use e-Request for missed or misdelivered notices and cards, and keep your address current with USCIS; a wrong address is one of the most common reasons a case seems to go silent.

Tracking several cases

Families often juggle an I-485, I-765 and I-131 at once, each with its own receipt number. The USCIS Case Tracker lets you paste them all, shows which office each prefix points to, lists the usual steps for the form, compares your wait with the national median, and keeps a status log in your browser (no account; it does not scrape USCIS, so you check status on the official page and record changes). If your case is a green card waiting on the Visa Bulletin, the Visa Bulletin Tracker covers that side, and the N-400 Citizenship Timeline helps when you get to naturalization.

FAQ

Can I tell which office is processing my case from the receipt number?

Only where it was first received. Cases can be transferred, so check your latest notice or status message for the current office before looking up processing times.

Why is my status still "Case Was Received" after months?

Status pages often do not change while a case waits in line. Compare your received date with the processing times page for your form and office; if you are past the case inquiry date, submit an e-Request.

Does "Case Is Being Actively Reviewed" mean approval is near?

Not necessarily. It means the case is under review, but it can appear more than once and may be followed by a request for evidence, an interview notice or a decision.

Is my receipt number private?

Anyone with your receipt number can see your case status headline on Case Status Online, so share it only with people helping with your case, such as your attorney or employer.

What does IOE mean?

IOE is the prefix for electronic filing, including forms filed through a USCIS online account and the immigrant visa fee. The community reading of the digits does not apply to IOE numbers.

Sources

• USCIS: Checking Your Case Status Online (receipt number format)
• USCIS: Congressional Inquiries Refresher (receipt prefixes)
• USCIS Case Status Online
• USCIS Case Processing Times
• USCIS: More Information About Case Processing Times
• USCIS e-Request
• USCIS: Immigration and Citizenship Data (quarterly processing time reports)
• USCIS: How Do I Request Premium Processing?

Last updated 2026-10-18. Processing times are as of October 2026 and change often; check the official USCIS pages for your form and office. This guide is general information, not legal advice.