The Obama administration is releasing a detailed account Wednesday of $77 billion in payouts to more than 880,000 health care providers nationwide in 2012.
The overwhelming majority of doctors billed the government modest amounts.
Care providers in Maryland pulled in nearly 2.3 percent of the $77 billion in payments Medicare made in 2012, slightly more than its share for its population and number of seniors.
Of the state's top 10 recipients, who received more than $84 million, five were doctors, four were ambulance companies and one was a clinical laboratory. The lab was the state's top recipient with more than $36.6 million in payments. The doctors included three ophthalmologists, a vascular surgeon and a hematologist-oncologist.
In all, more than 18,500 providers in the state billed Medicare.
Overall, 2 percent of health care providers accounted for 23 percent of the Medicare fees nationwide, federal information shows.
The two highest-paid doctors listed in the Medicare data are under government review for their billing. An ophthalmologist in the retiree haven of West Palm Beach, Fla., topped the list, taking in more than $26million to treat fewer than 900 patients. That is 61 times the average Medicare payout of $430,000 for an ophthalmologist.
A Florida cardiologist received nearly $23 million in Medicare payments in 2012, nearly 80 times the average amount for that specialty.
The release of payment records involving doctors has been blocked legally since 1979, but recent court rulings removed those obstacles. No personal information on patients is disclosed.
Medicare officials said disclosing physician payment data is an unprecedented opportunity to make the nation's health care system more transparent for consumers and accountable to taxpayers. Consumer advocates and employers applauded the move.
"Providing consumers with this information will help them make more informed choices about the care they receive," Jonathan Blum, Medicare's principal deputy administrator, said last week.
Still, federal officials cautioned against drawing sweeping conclusions about individual doctors from the data. They have warned that high payouts are not necessarily indicative of improper billing or fraud. Payments could be driven higher because providers were treating sicker patients who require more treatment.
These new figures reflect only Medicare Part B claims, which include doctor visits, lab tests and other treatment typically provided outside a hospital. The physician payouts include what Medicare paid plus any money the providers received from patients for deductibles and coinsurance. Spending on the Medicare program, which covers about 60 million elderly and disabled Americans, is expected to exceed $600billion this year. There is broad agreement that fraud is rampant in Medicare and Medicaid, the government health program for the poor, but estimates of the scope vary from $20 billion a year to more than $100billion.
The American Medical Association and other physician groups have long opposed the release of the Medicare data.
AMA President Dr. Ardis Dee Hoven said the group remains concerned that inaccuracies in the data or misinterpretation of the figures might unfairly tar some physicians as outliers.
She said some individual physicians might appear to be billing huge amounts to Medicare, when in fact it is their whole practice that bills under a single physician's name. In other cases, high-volume physicians might be experts in their field who will be portrayed in a bad light.
"How does a physician or a practice get their reputation back?" Hoven said. "And even more problematic, what happens to their referral base? What happens to their patients who end up going someplace else?"
In 2012, the top recipient of Medicare money in the country was a Florida ophthalmologist, Dr. Salomon Melgen, who has been a heavy donor to Sen. Robert Menendez. Last year, federal officials said a grand jury was looking into Melgen's billing practices, and a separate investigation was examining whether the New Jersey Democrat had intervened improperly on his behalf.
An attorney for Melgen, Kirk Ogrosky, said the physician has billed at all times in accordance with Medicare rules. Ogrosky said that the vast majority of the money attributed to Melgen reflects the cost of drugs used in treatment and that physician reimbursement is set at 6 percent above what is paid for the medications.