Deals among the nation’s largest health insurers in recent weeks have been almost head-spinning. But whatever the details, if the combinations are finalized, the result will be an industry dominated by three colossal insurers.

Consumer advocates, policy experts and former regulators say that what may be good for the insurers may not be good for consumers, especially in the wake of a similar frenzy of deal-making among hospitals and doctors’ groups.

“The consolidation in both of these industries has been shown to have an adverse impact on consumers,” said Leemore S. Dafny, a former official at the Federal Trade Commission who is now a professor at Northwestern University’s Kellogg School of Management.

Anthem, which operates for-profit Blue Cross plans in 14 states, merging with Cigna, another large for-profit carrier, along with the planned deal for Aetna to join Humana, a smaller rival known for its private Medicare plans, would create two behemoths.

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