Can't make a function that finds the value using the key with a JSON array using jQuery

Can't make a function that finds the value using the key with a JSON array
using jQuery

I am trying to build a calculator which uses data from JSON file. I cannot
change the way the data is keyed or labeled in the JSON file since it is
generated from a CSV file.
My JSON data looks like this (I am using a grep filter and then storing it
in a variable but for brevity I am not showing that part unless someone
needs to see it):
var medicare = {
"": "",
"80101": "NC",
"80104": "NC",
"80152": "24.61",
"80154": "22.72",
"80299": "18.83",
"82055": "14.85",
"82145": "9.71",
"82542": "16.01",
"82646": "23.91",
"82649": "23.91",
"83805": "24.23",
"83840": "13.04",
"83887": "22.26",
"83925": "26.74",
"83992": "20.20",
"99080": "NC",
"99358": "NC",
"Carrier Type": "Medicare",
"G0434": "12.17",
"State": "Minnesota",
"id": 122
}
And I need to create a function that will be able to return the value of
any of the given keys.
function findInside( array, key ) {
return array[key]; // <-- This is my problem.
}
Which I can use to return value by running:
console.log(findInside(medicare, "80101"))
I just need to be able to get the value. I don't think I need to do any
loops and such. I'm still new to JavaScript and am banging my head over
this one, and it should be pretty easy.
Thanks in advance!