Sifting through the opposing rulings on the legality of the subsidies on the federal health insurance exchange.
UnitedHealth Group Inc.'s fourth-quarter net income slipped 1 percent, as a rise in costs from medical claims and other expenses countered revenue gains for the nation's largest health insurer.
The Minnetonka, Minn., company also said Thursday it was reaffirming a forecast for 2013 earnings it made in November.
The insurer turned in "a solid quarter with few surprises, but less impressive than the company's performance earlier in the year," Leerink Swann analyst Jason Gurda said in a research note.
UnitedHealth earned $1.24 billion, or $1.20 per share, in the three months that ended Dec. 31. That compares with $1.26 billion, or $1.17 per share, in the last quarter of 2011, when the company had more shares outstanding.
Total revenue climbed 11 percent to $28.77 billion, but medical costs grew 12 percent to $20.8 billion.
The insurer normally trumps Wall Street earnings expectations, but this performance matched average analyst forecasts. Analysts expected earnings of $1.20 per share on $28.23 billion in revenue, according to FactSet.
Health insurance is UnitedHealth's largest business, but it also operates segments that sell information technology services and pharmacy benefits management. UnitedHealth also is the largest provider of Medicare Advantage plans, which are privately run versions of the government's Medicare program for the elderly and disabled people.
UnitedHealth's operating costs climbed 13 percent to $4.85 billion in the quarter. It also recorded a smaller gain, compared to the 2011 quarter, of $140 million because claims left over from earlier periods coming in lower than expected, which allowed it to release money held in reserve. That compares with a $310 million gain in the final quarter of 2011.
The insurer said operating costs climbed mainly because it decided to bring some pharmacy benefits management business it used to give to an outside company in-house and because it was preparing to start a new contract to cover military members and their families through the government's Tricare program.
UnitedHealth said in October that it would spend about $4.9 billion to buy a majority stake in Brazilian health benefits and care provider Amil Participacoes SA. The company is the largest health insurer in Brazil and also owns hospitals and clinics.
The insurer's enrollment jumped 18 percent in the quarter to 40.9 million people, compared to the 2011 quarter. That was largely due to the addition of the Brazilian business.
For the full year, UnitedHealth earned $5.53 billion, or $5.28 per share, on $110.62 billion in revenue.
The company said it still expects 2013 earnings to range between $5.25 and $5.50 per share on $123 billion to $124 billion in revenue.
Analysts expect, on average, earnings of $5.56 per share on about $122.1 billion in revenue.
UnitedHealth is the first insurer to report earnings every quarter, and many see it as a bellwether for the sector. WellPoint Inc. will be the next major insurer to report on its fourth quarter when it releases results Jan. 23.
UnitedHealth shares rose 19 cents to $53.86 in midday trading, while the Dow Jones industrial average _ of which UnitedHealth is a component _ also climbed less than 1 percent.
Last year, UnitedHealth shares were up 7 percent to close 2012 at $54.24.