WASHINGTON (AP) — Reigniting a debate about the bottom line for President Barack Obama’s health care law, a leading conservative economist estimates in a study to be released Tuesday that the overhaul will add at least $340 billion to the deficit, not reduce it.

Charles Blahous, who serves as public trustee overseeing Medicare and Social Security finances, also suggested that federal accounting practices have obscured the true fiscal impact of the legislation, the fate of which is now in the hands of the Supreme Court.

Officially, the health care law is still projected to help reduce government red ink. The Congressional Budget Office, the government’s nonpartisan fiscal umpire, said in an estimate last year that repealing the law actually would increase deficits by $210 billion from 2012 to 2021.

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