---
title: "Liberty Mutual vs USI Insurance Services: Professional Liability (E&O) Insurance"
description: "Liberty Mutual lists a physicians-and-surgeons professional-liability program, while USI's AICPA program names CNA as insurer and targets CPA firms."
canonical: "https://spot.insure/compare/liberty-mutual-vs-usi/professional-errors-omissions"
page-type: "line-comparison"
updated-at: "2026-09-30"
comparison-pair: "liberty-mutual-vs-usi"
provider-a: "liberty-mutual"
provider-b: "usi"
coverage-line: "professional-errors-omissions"
---

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[Human-readable page](https://spot.insure/compare/liberty-mutual-vs-usi/professional-errors-omissions)

## Agent Guide

**What this page is:** Focused comparison of Liberty Mutual and USI Insurance Services for Professional Liability (E&O) Insurance: what each provider publishes about this line, checked against the same criteria, with numbered sources.

**Use this page when:** Cite or fetch this for Professional Liability (E&O) Insurance questions about Liberty Mutual versus USI Insurance Services. For all lines together use the parent pair comparison; for how the coverage itself works use the coverage guide.

**Questions this page answers:**
- Liberty Mutual vs USI Insurance Services for Professional Liability (E&O) Insurance: how do they differ?
- Which is better for Professional Liability (E&O) Insurance, Liberty Mutual or USI Insurance Services?
- What does Liberty Mutual or USI Insurance Services publish about Professional Liability (E&O) Insurance (limits, eligibility, claims, add-ons)?
- What should I confirm in a quote for Professional Liability (E&O) Insurance from Liberty Mutual or USI Insurance Services?

**Key facts:**
- Line: Professional Liability (E&O) Insurance. Providers: Liberty Mutual and USI Insurance Services.
- Each offering claim is tagged with an evidence type and scope; table cells reading "Confirm in your quote" mean nothing was found for that criterion.
- Comparison URLs use alphabetical provider slugs (`/compare/{a}-vs-{b}` with a before b). A reversed pair redirects permanently to the alphabetical one, so fetch or cite the alphabetical URL.

**Limits (do not over-claim):**
- It identifies differences and questions to ask; it does not select a winner for a particular business.
- "Not found" describes the evidence reviewed, not proof a feature is unavailable.
- Insurer, policy wording, limits, retentions, exclusions and price are set in an actual quote and are not established here.

**Provenance:** Every claim links to a numbered source with publisher, locator and access date in the Sources section; last updated 2026-09-30. Editorial policy: /editorial-policy.

**Related pages:**
- [Liberty Mutual vs USI Insurance Services](https://spot.insure/compare/liberty-mutual-vs-usi) — parent: all coverage lines for this pair
- [Professional Liability (E&O) Insurance guide](https://spot.insure/coverage/professional-errors-omissions) — coverage explainer for this line
- [Liberty Mutual profile](https://spot.insure/insurance-providers/liberty-mutual) — provider profile (evidence)
- [USI Insurance Services profile](https://spot.insure/insurance-providers/usi) — provider profile (evidence)
- [Liberty Mutual vs USI Insurance Services Crime Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/crime) — sibling comparison (other line, or other pair for this line)
- [Liberty Mutual vs USI Insurance Services Cyber Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/cyber) — sibling comparison (other line, or other pair for this line)
- [Liberty Mutual vs USI Insurance Services Fiduciary Liability Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/fiduciary) — sibling comparison (other line, or other pair for this line)
- [Liberty Mutual vs USI Insurance Services Surety Bonds](https://spot.insure/compare/liberty-mutual-vs-usi/surety-bonds) — sibling comparison (other line, or other pair for this line)
- [Liberty Mutual vs USI Insurance Services Workers’ Compensation Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/workers-compensation) — sibling comparison (other line, or other pair for this line)
- [AIG vs Liberty Mutual Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-liberty-mutual/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [AIG vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-usi/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Alliance Risk vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-usi/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [Aon vs Liberty Mutual Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-liberty-mutual/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [At-Bay vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-usi/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)
- [The Baldwin Group vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/baldwin-vs-usi/professional-errors-omissions) — sibling comparison (other line, or other pair for this line)

# Liberty Mutual vs USI Insurance Services: How Do They Compare for Professional Liability (E&O) Insurance?

Liberty Mutual lists a physicians-and-surgeons professional-liability program, while USI's AICPA program names CNA as insurer and targets CPA firms.

## Research Scope and Use

Use this comparison to evaluate Liberty Mutual and USI Insurance Services for Professional Liability (E&O) Insurance against the same documented criteria. It identifies differences and questions to confirm; it does not select a winner for a particular business. Offering claims are what each provider publishes about this line unless marked otherwise. “Not found” describes the evidence reviewed, not proof that a feature is unavailable. Confirm the insurer, policy wording, limits, retentions, exclusions and cost in an actual quote.

## Summary

Liberty Mutual's listed program is for physicians and surgeons; USI's AICPA Professional Liability Program is underwritten by CNA and marketed to CPA firms. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity")

## What Is Liberty Mutual Business Insurance?

Liberty Mutual spans small-commercial, commercial, specialty, surety, and reinsurance businesses. The insurer and distribution route depend on the product, so check the offer and policy before you compare terms. [1](https://www.libertymutualgroup.com/about-lm/investor-relations/our-company/company-profile "Company Profile") [2](https://business.libertymutual.com/commercial-solutions/ "Commercial Insurance Solutions")

[Liberty Mutual profile](https://spot.insure/insurance-providers/liberty-mutual)

## What Is USI Insurance Services?

USI suits software and hardware companies from seed stage through IPO seeking consultative broker support; buyers wanting a self-serve quote should compare digital agencies. Insurer commissions are typical and contingent compensation may also apply. [4](https://www.usi.com/about-usi "The Power of ONE") [5](https://www.usi.com/property-casualty/technology/ "Technology Insurance") [6](https://www.usi.com/commissions-fees/ "Commissions and Fees")

[USI Insurance Services profile](https://spot.insure/insurance-providers/usi)

## What Is Professional Errors and Omissions (E&O) Insurance?

Professional liability can help pay defense costs and covered losses when a client says your advice or service caused financial harm. If customers rely on your work, list every service you provide and check the claims-made reporting and prior-work terms. [10](https://www.tdi.texas.gov/commercial/pl-faq.html "FAQ: Professional liability insurance") [11](https://www.iii.org/article/professional-liability-insurance "Professional liability insurance") [12](https://www.sba.gov/counseling/launch-your-business/#business-insurance "Get business insurance") [13](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf "Professional Liability – US Direct Errors and Omissions Insurance")

## Key Differences in Professional Liability (E&O) Insurance

### Different professions anchor the documented programs

Liberty Mutual lists Physicians & Surgeons Professional as a professional-liability-only specialty program. USI's AICPA Professional Liability Program is aimed at sole practitioners and regional CPA firms, so the published routes point to different professions; check whether either program accepts your specific practice. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity")

### USI names the carrier and CPA protections

USI identifies CNA as the insurer for its AICPA program and describes defense and damages for third-party claims alleging financial harm from CPA services. Liberty Mutual's listing confirms a physicians-and-surgeons program but does not give its insurer, limits, or form terms. A CPA firm can use USI's published description to frame questions, while a physician should request Liberty Mutual's actual policy details. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs")

### Their quote paths differ

USI Affinity directs CPA firms to contact its dedicated AICPA program team for quotes and renewals. Liberty Mutual says administrators manage its programs and provides inquiry contacts, so ask which administrator handles the physicians-and-surgeons program and what information it needs. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs")

## What to Confirm in Professional Liability (E&O) Insurance Quotes

- Ask Liberty Mutual which administrator handles Physicians & Surgeons Professional, who issues the policy, and what limits, exclusions, and retroactive date the quote includes. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs")
- If comparing USI, confirm the CNA policy's claims-made terms and whether the firm's services and individual practitioners are covered. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity")

## Offering Details

| Criteria | Physicians & Surgeons Professional program | AICPA Professional Liability Program (USI Affinity) |
| --- | --- | --- |
| Role in This Line | Liberty Mutual lists a Physicians & Surgeons Professional program, marked “PL Only,” in its specialty-program portfolio. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") (Evidence: Company-reported; scope: Official Liberty Mutual commercial/product page; company-reported description scoped to Physicians & Surgeons Professional program. Not policy wording, underwriting approval, state eligibility or a coverage guarantee..) | For CPA firms, USI runs the AICPA Professional Liability Program through its USI Affinity division as the endorsed producer, rather than underwriting the policy itself. USI's general Business Services practice separately brokers errors and omissions/professional liability coverage for other business types. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") [9](https://www.usi.com/property-casualty/business-services/ "Business Services") (Evidence: Company-reported; scope: AICPA program page and Business Services practice page..) |
| Issuing Insurer | Confirm in your quote. | USI's own page states that the AICPA Professional Liability Program is "underwritten by CNA," naming the carrier for that specific program. USI's general Business Services E&O placements do not name an insurer. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Direct quote from the AICPA program page; CNA underwrites only this named program, not USI's other professional-liability placements..) |
| Who It’s For | Liberty Mutual says its programs are managed by program administrators; the page provides program inquiry contact details. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") (Evidence: Company-reported; scope: Official Liberty Mutual commercial/product page; company-reported description scoped to Physicians & Surgeons Professional program. Not policy wording, underwriting approval, state eligibility or a coverage guarantee..) | USI markets the AICPA program to sole practitioners and regional CPA firms. It has offered CPA coverage since 1967 and has been the endorsed AICPA Program provider since 1994. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description..) |
| Coverage Features | The listing identifies professional liability only; it does not establish form terms, limits, exclusions or insurer for a quote. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") (Evidence: Company-reported; scope: Official Liberty Mutual commercial/product page; company-reported description scoped to Physicians & Surgeons Professional program. Not policy wording, underwriting approval, state eligibility or a coverage guarantee..) | USI describes the policy as insuring a CPA and their practice against third-party claims that professional services caused financial harm, providing a defense and paying damages for covered claims arising from high-risk situations tied to new clients, changing business plans, or new laws and regulations. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description; actual insuring agreements, exclusions and conditions are set by the issued CNA policy form..) |
| Limits and Retentions | Confirm in your quote. | The AICPA program page does not publish limit, retention or premium figures; it says coverage plans allow a firm to tailor coverage to its risk profile. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Not publicly disclosed; scope: Page as read on 2026-09-23..) |
| Risk Services | Confirm in your quote. | USI says firms enrolled in the program get supportive claims handling and exclusive access to risk-management resources, including engagement-letter templates, in addition to the coverage itself. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Program page description..) |
| How to Apply | The cited product page does not establish an online application or policy-binding path; ask the listed team or your broker/agent how this product is placed. [3](https://business.libertymutual.com/commercial-solutions/programs/ "Programs") (Evidence: Not found in reviewed sources; scope: Reviewed product-page scope only. This not-found disposition is not a claim that no digital route exists..) | USI directs CPA firms seeking a quote or renewal to contact USI Affinity, with a dedicated Affinity_APL@usi.com address for the AICPA program specifically. [7](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/ "Accountants Professional Liability — USI Affinity") (Evidence: Company-reported; scope: Contact instructions on the AICPA program page..) |

## Full Comparison

- [Liberty Mutual vs USI Insurance Services](https://spot.insure/compare/liberty-mutual-vs-usi): all coverage lines, business roles, service and claims.
- [What Is Professional Errors and Omissions (E&O) Insurance?](https://spot.insure/coverage/professional-errors-omissions): Professional liability can help pay covered defense costs and losses when a client says your advice or service caused financial harm; check services and reporting terms.
- [Liberty Mutual vs USI Insurance Services Crime Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/crime)
- [Liberty Mutual vs USI Insurance Services Cyber Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/cyber)
- [Liberty Mutual vs USI Insurance Services Fiduciary Liability Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/fiduciary)
- [Liberty Mutual vs USI Insurance Services Surety Bonds](https://spot.insure/compare/liberty-mutual-vs-usi/surety-bonds)
- [Liberty Mutual vs USI Insurance Services Workers’ Compensation Insurance](https://spot.insure/compare/liberty-mutual-vs-usi/workers-compensation)
- [AIG vs Liberty Mutual Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-liberty-mutual/professional-errors-omissions)
- [AIG vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/aig-vs-usi/professional-errors-omissions)
- [Alliance Risk vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/alliance-risk-vs-usi/professional-errors-omissions)
- [Aon vs Liberty Mutual Professional Liability (E&O) Insurance](https://spot.insure/compare/aon-vs-liberty-mutual/professional-errors-omissions)
- [At-Bay vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/at-bay-vs-usi/professional-errors-omissions)
- [The Baldwin Group vs USI Insurance Services Professional Liability (E&O) Insurance](https://spot.insure/compare/baldwin-vs-usi/professional-errors-omissions)

## Sources

### Liberty Mutual

1. [Company Profile](https://www.libertymutualgroup.com/about-lm/investor-relations/our-company/company-profile). Liberty Mutual Group; Strategic business units paragraph: US Retail Markets (individuals/small businesses; small commercial; countrywide) and Global Risk Solutions (mid-size/large businesses; commercial, specialty, reinsurance, surety; worldwide).. Accessed 2026-09-29.
2. [Commercial Insurance Solutions](https://business.libertymutual.com/commercial-solutions/). Liberty Mutual Business Insurance; Commercial solutions index names commercial auto and fleet, cyber, environmental liability, equipment breakdown, excess and surplus, general liability, healthcare liability, inland marine, management liability, multinational, ocean marine, professional liability, property, reinsurance, surety, umbrella/excess and workers compensation. Disclosure says policy insurer is named when offered, may be an affiliate/subsidiary or surplus-lines insurer; states/jurisdictions and actual policy terms vary.. Accessed 2026-09-29.
3. [Programs](https://business.libertymutual.com/commercial-solutions/programs/). Liberty Mutual Business Insurance; ‘Our programs portfolio’ lists Auto Salvage/Dismantlers, Fire Suppression and Sprinkler Contractors, Nonprofits, Physicians & Surgeons Professional (PL only), Post-surgical for bariatric and plastic surgeries, Roofing Contractors, Scrap Metal Dealers, Self-storage, and Sports and Fitness. Page says programs are managed by program administrators; not a complete business catalogue.. Accessed 2026-09-29.

### USI Insurance Services

4. [The Power of ONE](https://www.usi.com/about-usi). USI Insurance Services; History, client-count, nationwide office, and P&C / benefits / personal risk / retirement description. Accessed 2026-09-16.
5. [Technology Insurance](https://www.usi.com/property-casualty/technology/). USI Insurance Services; Technology practice client types, seed-to-IPO range, and listed insurance placement lines including PrivaSafe. Accessed 2026-09-16.
6. [Commissions and Fees](https://www.usi.com/commissions-fees/). USI Insurance Services; Licensed-producer authority, insurer-paid commission default, contingent compensation, and client request right. Accessed 2026-09-16.
7. [Accountants Professional Liability — USI Affinity](https://www.usi.com/programs/affinity-programs/accountants-professional-liability/). USI Insurance Services; Quality Professional Liability Insurance Exclusively for CPA Firms; "The AICPA Professional Liability Program, underwritten by CNA, has been offering coverage to CPAs since 1967 and has been the endorsed provider of the AICPA Program since 1994."; supportive claims handling and exclusive access to extensive risk management resources, including engagement letter templates; Email Affinity_APL@usi.com. Accessed 2026-09-23.
8. [USI Specialty Program Solutions](https://www.usi.com/programs/). USI Insurance Services; USI Affinity delivers high-quality insurance and financial solutions to members of affinity organizations and targeted industry segments...for professional associations, law firms, alumni and collegiate organizations, travel groups, and insurance administrators.. Accessed 2026-09-23.
9. [Business Services](https://www.usi.com/property-casualty/business-services/). USI Insurance Services; USI advises clients...and provides solutions for...Errors & Omissions/Professional Liability.... Accessed 2026-09-23.

### Professional Liability (E&O) Insurance Guide

10. [FAQ: Professional liability insurance](https://www.tdi.texas.gov/commercial/pl-faq.html). Texas Department of Insurance; What’s professional liability coverage?; What types of damages…; What’s general liability insurance?; Do I need professional liability… if I have general liability…?; Is professional liability insurance required?; Can a client require…?; What’s the difference between occurrence policies and claims-made policies. Accessed 2026-09-16.
11. [Professional liability insurance](https://www.iii.org/article/professional-liability-insurance). Insurance Information Institute; Opening paragraphs (professional services/advice and E&O name); Claims not covered by general liability; What types of businesses need professional liability insurance?; What’s covered… and what’s not (claims-made versus occurrence, defense and judgments, non-financial/intentional limits, BOP/in-home exclusion). Accessed 2026-09-16.
12. [Get business insurance](https://www.sba.gov/counseling/launch-your-business/#business-insurance). U.S. Small Business Administration; Six common types of business insurance table. Accessed 2026-09-16.
13. [Professional Liability – US Direct Errors and Omissions Insurance](https://www.hiscox.com/documents/pl-sample-policy-wording.pdf). Hiscox Inc. specimen; About this Policy / Coverage for Claims Made Against You; I.A Insuring Agreement; I.B Defense; I.C Settlement; II.A Notice of Claims; II.C Optional Extended Reporting Period; III.A, III.K, III.M, III.R, III.S Exclusions; IV.A–B Limits and Deductible; VI.O Professional Services; VI.U Wrongful Act. Accessed 2026-09-16.

Updated 2026-09-30. Spot, a product of Tools for Enlightenment, publishes this research and works in the commercial insurance market. The comparison applies the same criteria to both providers. [Editorial policy](https://spot.insure/editorial-policy). To suggest a correction, [contact Spot](https://spot.insure/contact) with the page URL and supporting source.

## Liberty Mutual Reviews

Review Score: 7.2 / 10 from 2 rated sources, equally weighted.

Customers give Liberty Mutual 4.2 out of 5 on Trustpilot from 3,836 reviews, but that page mixes auto, home and life customers with business ones. For business insurance specifically, NerdWallet gives 3.0 out of 5 and reports more complaints than expected.

- NerdWallet: NerdWallet editorial rating 3.0/5 (NerdWallet proprietary editorial score; not a consumer rating average or Spot Score). NerdWallet business-insurance editorial review, updated June 3, 2026. Its 3.0/5 is NerdWallet’s editorial score, not a consumer average or Spot Rating. It reports above-expected commercial-property and general-liability complaints for 2022–2024 and a low J.D. Power result. Period: Page updated June 3, 2026. Checked 2026-09-29. [Liberty Mutual Business Insurance Review 2026: Big Company Dogged by Customer Complaints](https://www.nerdwallet.com/business/insurance/learn/liberty-mutual-business-insurance)
- Trustpilot: Trustpilot consumer TrustScore 4.2/5 (Platform aggregate for a mixed Liberty Mutual brand profile; not business-only); 3836 reviews. Company-wide Liberty Mutual Trustpilot profile. Its description highlights auto, home and life insurance; review excerpts are not restricted to commercial buyers or one issuing entity. The displayed score/count are a consumer-review-site aggregate, separate from editorial ratings and survey data. Period: Displayed September 29, 2026; live total changes. Checked 2026-09-29. [Liberty Mutual Reviews](https://www.trustpilot.com/review/www.libertymutual.com)

Reviewed 2026-09-29. [Read the sourced review](https://spot.insure/insurance-providers/liberty-mutual/reviews).

## USI Insurance Services Reviews

Review Score: 6.4 / 10 from 1 rated source, equally weighted.

USI’s public feedback is too sparse and office-specific for a firmwide verdict. Check the local team’s responsiveness and experience with your type of business.

- BBB: BBB complaint count 4. BBB business-profile grade is distinct from customer-review stars; branch/parent scope matters. Period: three years preceding access 2026-09-25. Checked 2026-09-25. [BBB result for USI Insurance Services](https://www.bbb.org/us/ny/valhalla/profile/insurance-agency/usi-insurance-services-0121-97856/complaints)
- Google reviews via Birdeye: Birdeye office listing rating from Google reviews 3.2 (5 stars); 9 reviews. One Louisville office listing, not firmwide. Birdeye shows Google-origin reviews (9) and 0 Birdeye-native reviews; this duplicates a Google source stream and is not independent of Google. Period: accessed 2026-09-25. Checked 2026-09-25. [USI office, Louisville, KY — Birdeye listing of Google reviews](https://reviews.birdeye.com/usi-insurance-145632496752867)

Reviewed 2026-09-25. [Read the sourced review](https://spot.insure/insurance-providers/usi/reviews).

## Agent and Developer Resources

- [Markdown page](https://spot.insure/compare/liberty-mutual-vs-usi/professional-errors-omissions.md)
- [Developer resources](https://spot.insure/developers)
- [Public MCP server](https://spot.insure/mcp)
- [MCP server manifest](https://spot.insure/server.json)
- [OpenAPI description](https://spot.insure/openapi.json)
- [Public page index](https://spot.insure/llms.txt)