A sequence number in court is a tracking label a clerk assigns to a single filing inside a lawsuit so the court and the parties can refer to that filing without confusion. In most state trial courts, it means a motion sequence number, which identifies one specific motion or petition within a case that may contain dozens of them. In federal court, the same phrase usually points to something else: the sequential digits inside the case number itself. Knowing which meaning applies to the document in front of you is the whole trick.
What a Motion Sequence Number Is
A motion sequence number is an identifier the clerk assigns to each new motion or petition filed in a case. The first motion filed might be labeled Sequence No. 001. When the other side later files a motion for summary judgment, that one becomes Sequence No. 002. The numbering continues in order for as long as the case is active.
The system is most closely associated with state trial courts. New York’s Supreme Court, for example, formally assigns a sequence number to every motion or petition once the filing fee is paid, and the next filing in the same case receives the next number. Other state court systems use similar internal tracking, though the terminology and formatting vary. If you see “Motion Seq. No.” followed by a number on a court document, that is what you are looking at.
How It Differs From the Case Number
The case number, sometimes called an index number or docket number, identifies the entire lawsuit from the day it is filed to the day it closes. Every document in that lawsuit carries the same case number, whether it is the original complaint, an answer, or the fiftieth motion filed three years in.
The motion sequence number identifies a single event inside that master file. A case has one case number but can accumulate many sequence numbers over its lifetime. The relationship is hierarchical: the case number is the folder, and each sequence number is a labeled tab inside it. The structure lets a judge say “I’m ruling on Sequence No. 004” and have everyone know which request is being decided, even if seven other motions are still pending.
How Sequence Numbers Get Assigned
In courts that use them, motion sequence numbers follow strict chronological order based on filing date. The first motion filed receives the lowest number, and each subsequent motion gets the next number in line. The numbering stays fixed regardless of which party files the motion, so the sequence reads like a straightforward log of every major request the court has been asked to decide. Many state courts assign the number once the filing fee is paid.
Cross-Motions and Supporting Papers
A cross-motion does not get its own sequence number. Courts treat cross-motions as attached to the original motion they respond to, grouping both under the same number. The judge will typically decide them together.
Supporting documents such as affidavits, exhibits, and memoranda of law also do not generate new sequence numbers. They are filed under the number of the motion they support. The sequence number tracks the request itself, not every piece of paper tied to it.
Where to Find It on a Document
On a paper filing or PDF, the sequence number appears in the caption area at the top of the document, in the formatted block that includes the court name, case title, and case number. The sequence number usually sits on the right-hand side, near or just below the case number, labeled something like “Motion Seq. No. 003.”
You will see it most prominently on a Notice of Motion, an Order to Show Cause, or a judge’s Decision and Order resolving a specific motion. On routine filings submitted in support of a motion, the sequence number may appear in the caption or in the document’s header text referencing the motion the filing supports.
In electronic filing systems, the sequence number is often embedded in the digital header that the court’s software stamps on each filed document. That header typically shows the case number, the filing date, and the sequence or docket entry number.
Using the Sequence Number to Track a Motion
The sequence number’s real value is as a search tool. If you are waiting on a ruling, you do not need to wade through every filing in the case. Entering the motion sequence number into the court’s electronic docket system pulls up only the documents and status updates tied to that specific request.
State courts that use motion sequence numbers often display the disposition alongside the number, showing whether the motion is pending, granted, denied, or scheduled for oral argument. In complex commercial litigation where a case might have 20 or 30 active motions at various stages, that filter is what makes the docket readable.
What the Term Means in a Federal Case Number
If you ran across “sequence number” while looking at a federal case number rather than a motion, it refers to something different. Federal case numbers contain a sequential component that indicates where the case falls in the court’s filing order for the year. In a district court docket number formatted as 1:24-cv-00567, the “00567” is the sequence number, meaning the case was the 567th civil action filed in that division in 2024.
Federal Rule of Civil Procedure 79 requires clerks to assign consecutive file numbers to all actions entered in the civil docket, which is the mechanism behind this sequential numbering.1Office of the Law Revision Counsel. Federal Rules of Civil Procedure Rule 79 – Books and Records Kept by the Clerk and Entries Therein Unlike a motion sequence number, this type of sequence number identifies the case itself and never changes.
How Federal Courts Track Motions Instead
Federal courts generally do not use a separate motion sequence numbering system. They rely on the Case Management/Electronic Case Files system, known as CM/ECF, which assigns a chronological docket entry number to every document filed in a case. These are typically cited as “ECF No. 12” or “Docket Entry 12,” and they cover everything from the initial complaint to individual motions to supporting exhibits.
When you need to reference a specific attachment, the convention is to add a hyphen and the attachment number. “ECF 12-2” means the second attachment to docket entry 12. The system achieves the same organizational goal as motion sequence numbers but through a single unified numbering scheme for all filings. On PACER, you look up filings by docket entry number rather than by motion sequence.
What to Do About an Error in a Sequence Number
Mistakes in sequence numbering are rare because the clerk’s office assigns the number, not the filing party. Errors show up more often on documents prepared by attorneys who reference the wrong sequence number when responding to a motion or submitting supporting papers.
In federal court, a clerk cannot reject a filing solely because of a formatting error. Federal Rule of Civil Procedure 5(d)(4) explicitly prohibits clerks from refusing to file a paper just because it does not conform to the prescribed form.2United States Courts. Federal Rules of Civil Procedure With Forms The filing goes through, and the error gets corrected administratively or through an amended filing.
If the error is in an attorney’s papers rather than the court’s records, the attorney can typically file a corrected version. Under Federal Rule of Civil Procedure 15, a party may amend a pleading once without permission if done within 21 days of serving it, and after that window, amendments require either the other side’s consent or the court’s approval.3Legal Information Institute. Rule 15 Amended and Supplemental Pleadings For a simple typographical error in a sequence number reference, courts routinely grant leave to correct. The bigger risk is not the error itself but the confusion it creates. If you cite the wrong sequence number in opposition papers, the judge’s clerk might not connect your response to the right motion, and your arguments can be overlooked when the motion is decided.