The World Health Organization sets a list of medical conditions into well-used code called the “International Statistical Classification of Diseases and Related Health Problems,” or ICD for short. The official alphanumeric ciphers are used in medical records and insurance claims worldwide, noting the wide range of ailments and conditions a human may experience—everything from “tuberculosis” and “gastric ulcers” to “struck by orca” and “burn due to water skis on fire.”

The latter categories of unusual and puzzlingly specific conditions even inspired the 2014 book Struck by Orca: ICD-10 Illustrated.

But how often are these peculiar codes actually used? An insurance data company did the work to find out. The most bizarre ICD codes listed in the 2014 book, such as the title “struck by orca,” were not used in the US in the last 12 months, which is both good and disappointing. But codes just slightly less bizarre were used—some quite a lot, such as W503: “accidental bite by another person.”

To get the answer, the company, called Amino, swept through its extensive healthcare data. Amino is a San Francisco-based healthcare transparency company, headed by CEO David Vivero, a former executive of Zillow, the online real estate database company. With tens of millions in venture capital and investments, the company bought and aggregated 9 billion insurance claims. So it's in a good position to know the most unusual conditions Americans turn up with.

Amino found that 25,500 people experienced a W2203, which is code for “walked into furniture.” In the same vein, 17,200 Americans walked into walls and 400 walked into a lamppost.

Perhaps with all our eyeballs glued to phones and tablets these days, the oblivious walking accidents aren’t surprising. But barnyard animals have less of an excuse. In the last year, 1,700 people showed up with W5522: “struck by cow,” and 200 had W6132: “struck by chicken.”

More understandable, 700 people had a W5511, “bitten by horse,” and there were 300 W5541s, “bitten by pig.” In a head-scratcher, there were 10,600 W503s, “accidental bite by another human," though.

While the use of “accidental” is a bit puzzling there, the ICD codes are a little more clear in their use of the word “contact.” For instance, 2,200 patients had a W294: “contact with nail gun,” and there were 3,400 W28s, “contact with powered lawn mower.” A whopping 8,900 people had a W270, “contact with workbench tool.” Some 600 people showed up with a W261, “contact with sword or dagger.”

Of course, codes with such few uses may suffer from just transcription error, Amino notes. Still, be careful out there, especially around cows, sword fights, power tools, and pedestrian obstacles.