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

Sole practitioners and regional CPA firms can use USI Insurance Services's AICPA program, underwritten by CNA, with risk-management resources such as engagement-letter templates. Corgi's Miscellaneous E&O is for service businesses generally.

USI says its AICPA Professional Liability Program, sold exclusively to CPA firms, is underwritten by CNA. Corgi's Miscellaneous E&O, marketed to service businesses generally, names no carrier. ^4,^2,¹

What Are the Key Differences Between Corgi and USI Insurance Services Professional Liability (E&O) Insurance?

A Named Carrier for a Narrow Audience Versus No Carrier for a Broad One

USI's own page states that the AICPA Professional Liability Program, which it runs as the endorsed producer through its USI Affinity division, is "underwritten by CNA," naming the carrier for that specific program. ⁴ Corgi's Miscellaneous E&O listing names no carrier at all; its general disclosures describe affiliated or third-party partner carriers without identifying which applies to this line. ³

CPA Firms Only Versus a Catch-All for Service Businesses

USI markets the AICPA program to sole practitioners and regional CPA firms specifically, and has been the endorsed AICPA Program provider since 1994. ⁴ Corgi markets Miscellaneous E&O to service-based businesses generally, positioned as what's left over once a business doesn't fit Corgi's own Tech E&O, Real Estate E&O or Lawyer E&O products. ¹

A Named Risk-Management Service Versus None Described

USI says firms enrolled in the AICPA program get supportive claims handling and exclusive access to risk-management resources, including engagement-letter templates, in addition to the coverage itself. ⁴ Corgi's Miscellaneous E&O listing describes no comparable risk-management resources or claims-handling service. ¹

What Should You Confirm in Corgi and USI Insurance Services Professional Liability (E&O) Insurance Quotes?

If you're a CPA firm, ask USI whether your quote falls under the AICPA program or its general Business Services brokerage, since USI runs both. ⁶
Ask Corgi to name the underwriting carrier for your Miscellaneous E&O quote; the reviewed pages don't identify one. ³
Get published limit or premium figures from both; neither reviewed page shows them for these lines. ⁴ ¹
Ask USI which risk-management resources actually apply to your firm size before assuming the full engagement-letter library is included. ⁴

Corgi vs USI Insurance Services Professional Liability (E&O) Compared

Corgi vs USI Insurance Services: Professional Liability (E&O) Insurance: documented features by provider

Criteria	Corgi Miscellaneous E&O	AICPA Professional Liability Program (USI Affinity)
Who It’s For	Corgi targets Miscellaneous E&O at service-based businesses generally, positioned as a catch-all for professional-liability exposure not covered by its technology-, real-estate-, or legal-specific E&O products. ^2,¹Company-reported. Catalog description; no industry, size, or state restrictions are published for this line.	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. ⁴Company-reported. Program page description.
How to Apply	Miscellaneous E&O sits outside Corgi's instant-quote flow; the site groups it with policies quoted in 1-14 days rather than through the self-serve online application used for its core coverages. ^2,¹Company-reported. Homepage and startup-insurance page policy-card labeling.	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. ⁴Company-reported. Contact instructions on the AICPA program page.
Coverage Features	Corgi describes Miscellaneous E&O as broad professional liability coverage for service-based businesses facing claims of negligence, errors, or failure to perform professional services, distinct from its named Tech E&O, Real Estate E&O, and Lawyer E&O products. ^2,¹Company-reported. One-sentence catalog description; no policy form, insuring agreement, exclusion, or claims-made/occurrence trigger is published for this line.	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. ⁴Company-reported. Program page description; actual insuring agreements, exclusions and conditions are set by the issued CNA policy form.
Role in This Line	Corgi lists Miscellaneous E&O as a specialty coverage quoted with a 1-14 day turnaround, separate from its instant-quote Tech & AI Liability product and from its Real Estate E&O and Lawyer E&O products, which target specific professions. ^2,¹Company-reported. Homepage and startup-insurance page policy-card labeling as of 2026-09-23. No dedicated product page was found; direct URL guesses (/miscellaneous-errors-and-omissions, /misc-eo) returned 404s.	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. ^4,⁶Company-reported. AICPA program page and Business Services practice page.