What signs should I see to indcate a review is warranted?

Claim activity

Increasing claim activity

Claim dispute

Multiple and late Xmod revisions

Xmod varies within the rating period

A major increase in Xmod

Buying/Selling companies

Subrogated/Denied claims

Missing credits/Added debits

Audit - Claim - Class Codedisputes

Multiple state exposure

Payroll audit dispute

Class code dispute