Maryland lawmakers on Wednesday finalized a bipartisan measure to collect $380 million in taxes from health insurers next year to help curtail surging premiums for 150,000 Marylanders and prevent the state’s Obamacare marketplace from a potential collapse.

The legislation was a quiet, one-year compromise between the Democratic-controlled General Assembly and Republican Gov. Larry Hogan, who is expected to sign the measures.

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For the sake of competition in Maryland’s Obamacare marketplace — particularly for those who buy insurance as individuals, not through their employers — Evergreen Health needs to survive. CareFirst BlueCross BlueShield had 80 percent of Maryland’s individual insurance market in 2014, according to the Kaiser Family Foundation, up from 74 percent three years before. Evergreen, with nearly 40,000 members and growing fast, is expanding in the state at a time when other carriers are pulling back. Though still relatively small, it provides another option for consumers and puts pressure on the dominant carrier to innovate and contain costs.

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Evergreen Health Cooperative must pay $24.2 million to its biggest competitor because of an Affordable Care Act program that aims to level the playing field for insurers taking on riskier customers from state health insurance exchanges.

Evergreen, an innovative insurer established under the new law by former Baltimore Health Commissioner Peter Beilenson, is not alone in having to pay for its healthier clients. Kaiser Permanente of the Mid-Atlantic States owes $14.7 million and Aetna will shell out $11.8 million.

When consumer advocates tried to call the obstetrician-gynecologists in the online directory of insurers’ in-network providers on the Maryland state exchange, they found that only about 22% of the 1,493 practitioners were accepting new patients, performed well-patient visits and had appointments available within four weeks. More than a third  weren’t available at all because they had left the networks, retired or were dead.