Coverage description
An Insurance Services Office (ISO) standard form. Excludes bodily injury and property damage from the hazardous properties of nuclear material, including where the insured is covered under a nuclear energy liability policy.
What the form says
Key clauses from the latest edition, 09 08 (Sep 2008), quoted as filed.
“Nuclear Energy Liability Insurance Association, Mutual Atomic Energy Liability Underwriters, Nuclear Insurance Association of Canada”
IL 00 21 09 08
Nuclear pools come first. The exclusion applies when an insured is, or would be, covered under a policy from these nuclear insurers.
“"Hazardous properties" includes radioactive, toxic or explosive properties.”
IL 00 21 09 08
Hazardous properties. Reaches toxic and explosive effects, not only radiation.
“"Property damage" includes all forms of radioactive contamination of property.”
IL 00 21 09 08
Contamination is property damage. Contamination claims fall within the exclusion without physical injury to property.
How the form has changed
1 change across 1 revision, newest first. Each edition is compared with the one before it, using wording from filed copies.
09 08 edition
Sep 2008, compared with 07 02Latest editionLists the Medical Professional Liability Coverage Part among the coverage parts it modifies.
07 02
“PROFESSIONAL LIABILITY COVERAGE PART”
09 08
“MEDICAL PROFESSIONAL LIABILITY COVERAGE PART”
Editions
Edition dates as filed, newest first. Filing counts include every state submission that lists the edition.
| Edition | Filings | Companies | States | Filed |
|---|---|---|---|---|
| 09 08Sep 2008Latest | 708 | 200 | 46 | Nov 2021 to Oct 2026 |
| 07 02Jul 2002 | 13 | 14 | 9 | Jan 2022 to Jun 2026 |
| 04 98Apr 1998 | 11 | 12 | 5 | Oct 2022 to Jun 2026 |
| 11 85Nov 1985 | 9 | 5 | 4 | Jun 2022 to Oct 2024 |
3 other edition dates appear in one or two filings each, often carrier-specific versions: 01 24, 11 98, 11 94.
Where filings record what this form replaced, they name earlier editions 05 04, 11 85, 11 94, 04 98 and other forms IL 01 98, M-4600A. Only some filings record replacements.
What the filings show
- Edition in use: in the past 12 months, 88 companies filed the 09 08 edition and 8 companies filed 04 98.
- IL 00 03 (Calculation of Premium) is filed alongside it most often, in 473 of the same filings (64%).
Filed under
Data from admitted P&C filings with state insurance departments, submitted Oct 2021 to Oct 2026, excluding withdrawn and rejected filings. One filing can cover several affiliated companies.
Carriers filing this form
The 10 carrier groups with the most filings that include IL 00 21, out of 90 in total.
| Carrier | Filings | States | Editions, most filed first | Last filed |
|---|---|---|---|---|
| Clear Blue Financial Group2 group companies filed it, led by Clear Blue Insurance Company and Rock Ridge Insurance Company | 75 | 36 | 09 0804 9807 02 | Jun 17, 2026 |
| OBS Holdings Group2 group companies filed it, led by Obsidian Insurance Company and Obsidian Pacific Insurance Company | 74 | 37 | 09 08 | Apr 17, 2023 |
| Cincinnati Financial Group3 group companies filed it, led by The Cincinnati Casualty Company and The Cincinnati Insurance Company | 56 | 33 | 09 0811 85 | Sep 21, 2026 |
| Berkshire Hathaway Group17 group companies filed it, led by Berkshire Hathaway Homestate Insurance Company and GEICO General Insurance Company | 41 | 22 | 09 0807 02 | Aug 18, 2026 |
| Nationwide Corporation Group12 group companies filed it, led by Nationwide Mutual Insurance Company and Nationwide Agribusiness Insurance Company | 39 | 17 | 09 08 | Apr 7, 2026 |
| Tokio Marine Holdings Incorporated Group7 group companies filed it, led by U.S. Specialty Insurance Company and Safety National Casualty Corporation | 38 | 16 | 09 0807 02 | Feb 17, 2026 |
| Markel Corporation Group5 group companies filed it, led by State National Insurance Company, Inc. and National Specialty Insurance Company | 32 | 13 | 09 0807 02 | Oct 22, 2026 |
| ACP Insurance Mgmt LLC GroupAccelerant National Insurance Company | 20 | 4 | 09 08 | Dec 8, 2025 |
| WCF Mutual Insurance Company Group2 group companies filed it, led by Associated Indemnity Corporation and WCF National Insurance Company | 19 | 18 | 09 08 | Jan 15, 2026 |
| MS & AD Insurance Group3 group companies filed it, led by Transverse Insurance Company and Mitsui Sumitomo Insurance Company of America | 16 | 5 | 09 08 | Sep 4, 2025 |
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States
Number of filings that include IL 00 21 in each state, Oct 2021 to Oct 2026. Darker states have more filings.
Often filed with
Standard-style form numbers that appear in the same filings most often.
- IL 00 03Calculation of Premium473 filings
- IL 00 17Common Policy Conditions454 filings
- CA 99 33Employees as Insureds310 filings
- CA 20 48Designated Insured for Covered Autos Liability Coverage299 filings
- CA 04 44Waiver of Transfer of Rights of Recovery Against Others to Us (Waiver of Subrogation)289 filings
- CA 20 01Lessor – Additional Insured and Loss Payee265 filings
- CA 99 16Hired Autos Specified as Covered Autos You Own263 filings
- CA 99 10Drive Other Car Coverage – Broadened Coverage for Named Individuals256 filings
- CA 99 30Tapes, Records and Discs Coverage256 filings
- CA 23 05Wrong Delivery of Liquid Products254 filings
Recent filings
Latest filings that include this form number. Filed copies open in FilingFocus.
| Submitted | Company | State | Editions | Tracking number |
|---|---|---|---|---|
| Oct 22, 2026 | State National Insurance Company, Inc. | CO | 09 08 | STNA-135128706 |
| Oct 16, 2026 | MIC General Insurance Corporation | NJ | 09 08 | GMMX-135128490 |
| Oct 14, 2026 | Century-National Insurance Company | GA | 09 08 | GMMX-135119885 |
| Oct 6, 2026 | American Casualty Company of Reading, Pennsylvaniaand 5 more | CA | 09 08 | CNAB-135091690 |
| Sep 21, 2026 | The Cincinnati Casualty Companyand 2 more | NV | 09 08 | CNNA-135046178 |
| Sep 4, 2026 | Incline Casualty Company | SC | 09 08 | AIAD-135047572 |
| Sep 4, 2026 | Southern Trust Insurance Company | GA | 09 08 | STTR-135079411 |
| Sep 1, 2026 | MIC General Insurance Corporation | NV | 09 08 | GMMX-135075522 |
| Aug 28, 2026 | Jet Insurance Company | SC | 09 08 | MRTN-134878222 |
| Aug 18, 2026 | National Indemnity Company | WY | 09 08 | NTIN-135019781 |
| Aug 18, 2026 | National Liability and Fire Insurance Company | WY | 09 08 | NTIN-135035948 |
| Aug 17, 2026 | Mississippi Farm Bureau Casualty Insurance Company | MS | 09 08 | SFBC-135017175 |
Related coverage topics
Most filed ISO IL forms
- IL 00 17 Common Policy Conditions
- IL 12 01 Policy Changes
- IL DS 00 Common Policy Declarations
- IL 09 85 Disclosure Pursuant to Terrorism Risk Insurance Act
- IL 00 03 Calculation of Premium
- IL 09 52 Cap On Losses From Certified Acts Of Terrorism
- IL 09 53 Exclusion of Certified Acts of Terrorism
- IL 09 98 Disclosure of Premium Through End of Year For Certified Acts of Terrorism Coverage (Pursuant to Terrorism Risk Insurance Act)
- IL 09 35 Exclusion of Certain Computer-Related Losses
- IL 09 99 Disclosure of Premium and Estimated Premium for Certified Acts of Terrorism Coverage (Pursuant to Terrorism Risk Insurance Act)
- IL 09 17 Resident Agent Countersignature Endorsement
- IL 02 70 California Changes - Cancellation And Nonrenewal
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