HARRISBURG — Gov. Tom Corbett’s meeting with U.S. Health and Human Secretary Kathleen Sebelius on whether he’ll seek an expansion of Medicaid to provide health care to hundreds of thousands of low-income Pennsylvania adults comes as state revenues are lagging his projections.

The meeting is set for late this afternoon in Washington, D.C.

On Monday, Corbett’s administration remained quiet about what kind of concessions he might seek from Sebelius to address his complaints about the need for flexibility in Medicaid and the potential cost to Pennsylvania taxpayers.

A spokeswoman would not discuss details of the matters the governor will raise in the meeting. Instead, she pointed to the governor’s previous statements that his administration has unanswered questions about the Medicaid expansion, and he is seeking more flexibility to tailor benefits packages to different types of enrollees.

Under the 2010 Affordable Care Act, states were required to expand Medicaid’s eligibility rules, primarily to benefit low-income working adults. But a U.S. Supreme Court decision last summer ruled that the federal government could not force states into the expansion, and it thus became a decision for each state.

Thirty-seven House Republicans are co-sponsoring a bill that would prohibit a Medicaid expansion. However, many, if not all, Democratic lawmakers support an expansion, as do a growing number of Republican senators, the AARP, hospital executives and labor unions.

Corbett has three months left until he must join with lawmakers to approve a budget, and his financial flexibility is slimmer than he had anticipated. A disappointing report Monday on March tax collections left state accounts about $200 million behind the expectations in Corbett’s Feb. 5 budget proposal.