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A BMC-91X is a certificate of insurance that your insurer files with FMCSA to evidence your public liability coverage. It is the single most common record in the federal insurance file, and it is routinely mistaken for the policy itself. It is not the policy. Here is what it is, what each field means, and which four other forms get confused with it.
Under 49 CFR 387.313, evidence of the required financial responsibility is filed with FMCSA by the insurer or surety, not by the carrier. The regulation distinguishes the two liability certificate forms directly:
"Form BMC 91 certificates of insurance will be filed with the FMCSA for the full security limits"
"Form BMC 91X certificate of insurance will be filed to represent full coverage or any level of aggregation"
49 CFR 387.313, Forms and procedures
That is the whole practical difference between the two. A BMC-91 covers the full required limit on one certificate from one insurer. A BMC-91X can represent one layer of a stack — which is why it is the form used when coverage is aggregated across a primary policy and one or more excess layers, and why it dominates the file.
What the filing is not: it carries none of your policy's terms. No exclusions, no deductible, no radius of operation, no schedule of units, no named drivers. It is an attestation to the agency that coverage at a stated limit exists, plus the handful of identifiers needed to tie it to a policy.
| What you see | What it is |
|---|---|
| Insurance company name | The insurer that filed the certificate. Note that the same insurer often appears under several legal names and spellings across the federal files, so a name that looks unfamiliar may be a group affiliate of the company on your declarations page. |
| Policy number | The insurer's own identifier for the policy the certificate evidences. This is the number a records department needs to find your claim file. |
| Form code | BMC-91X, BMC-91, BMC-34, BMC-84, BMC-85 or BMC-35 — see the table below. This is the field that tells you what kind of security you are looking at. |
| Effective date | The date the filing takes effect. Not an expiry date, and not a renewal date — the federal record contains no expiry for a liability filing. See the filing anniversary. |
| Coverage amount | The limit stated on the certificate. |
| Underlying limit | Present only on excess filings. A non-zero underlying limit means this certificate sits above other coverage — so this is an excess layer, not your primary limit. |
Because a BMC-91X can represent any level of aggregation, a carrier with layered coverage has several liability filings on record at once, and the largest dollar figure among them is frequently an excess layer rather than the primary. Sorting your filings by size and reading the top one gives you the wrong answer. The field that resolves it is the underlying limit: a filing that names one is stacked on top of coverage recorded elsewhere.
It is a real pattern, not a hypothetical one: 4,402 of the 268,529 BMC-91X rows in the file carry an underlying limit above zero. Every one of those is an excess layer whose stated amount is not that carrier's primary limit.
FMCSA's public insurance dataset stores liability, cargo, broker and freight-forwarder security together, plus cancellations. Filtering on the wrong field surfaces a broker's bond or a cargo certificate as though it were your liability coverage. Counts below are from the FMCSA insurance file, dataset c5y8-a4uz, queried 30 July 2026 — 302,227 rows in total:
| Form | What it evidences | Rows | Amount pattern |
|---|---|---|---|
| BMC-91X | Public liability (bodily injury and property damage), any level of aggregation | 268,529 | Clusters on the 49 CFR 387.9 schedule — see below |
| BMC-91 | Public liability, full security limits on one certificate | 2,078 | Same schedule |
| BMC-34 | Cargo insurance — not liability | 9,008 | Every single row is exactly $5,000 |
| BMC-84 | Broker or freight-forwarder surety bond — not the carrier's liability coverage | 11,981 | Every single row is exactly $75,000 |
| BMC-85 | Broker or freight-forwarder trust fund agreement, the alternative to a BMC-84 | 473 | Every single row is exactly $75,000 |
| BMC-35 | Notice of cancellation of an insurance filing — the opposite of coverage | 9,185 | Carries the cancelled policy's figures |
| BMC-82, BMC-36, BMC-83, NC | Motor-carrier surety bond, notice of cancellation of a bond, cargo surety bond, and a small uncoded remainder | 973 | Mixed |
Two of those amount patterns are not coincidences, and they are a useful sanity check on your own record:
49 CFR 387.9 sets the schedule of minimum public liability limits. For for-hire interstate carriage of non-hazardous property in a vehicle rated 10,001 lbs or more, the minimum is $750,000. Oil and most hazardous materials raise it to $1,000,000, and bulk hazardous substances and certain divisions raise it to $5,000,000.
The federal file shows carriers filing at exactly those figures. Of the 268,529 BMC-91X rows in c5y8-a4uz on 30 July 2026:
| Filed limit | BMC-91X rows | Matches |
|---|---|---|
| $750,000 | 140,253 | 387.9 minimum, non-hazardous property |
| $1,000,000 | 113,583 | 387.9 minimum for oil and most hazmat; also a common contractual requirement |
| $5,000,000 | 4,236 | 387.9 minimum for bulk hazardous substances |
| $2,000,000 | 2,933 | Above the schedule |
Counts are rows in the published file, not distinct carriers. The file stores the same filing more than once — 268,529 BMC-91X rows cover 70,282 distinct USDOT numbers, about 3.8 rows each — so a carrier with several rows is usually one filing recorded repeatedly, not several policies. The proportions are what the figures are offered for.
See your own filing, field by field. The free lookup queries the same FMCSA files live and shows the insurer of record, the form code, the filed limit, the policy number and the filing date for your USDOT number.
No signup. Nothing cached. It reports the record and does not interpret your policy.
You do not have to take any third party's word for what your record says, including ours. Two FMCSA systems publish it directly:
If a filing on your record looks wrong — an insurer you do not recognise, a limit that does not match your declarations page, a policy number that is not yours — the correction has to come from the party that filed it. Only the insurer or surety can amend or replace a certificate it filed. Your agent of record is the fastest route to that conversation.
RenewalReady is document-preparation software. Nothing above evaluates whether your coverage is adequate, interprets your policy, or recommends a limit — those are a licensed agent's job and we are not one. Everything here describes what a public federal record contains and what the regulations that produce it say.
c5y8-a4uz on the US DOT open data portal, queried 30 July 2026. datahub.transportation.gov