An InsuredPatient contains all the data of a Patient, plus fields to hold an insurance company name and the percentage of the hospital bill the insurance company will pay.

Company : Portion of bill paid by insurance (%)
Wrightstown Mutual 80
Red Umbrella 60
All other companies 25

How to get the Company percentage listed above?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace pit
{
    class InsuredPatient : Patient
    {
        public string InsuranceCompany { get; set; }
        public string InsurancePercentage { get; set; }
    }
    class Patient : IComparable
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public int Age { get; set; }
        public double AmountDue { get; set; }

        public override string ToString()
        {
            return ("Patient ID Number " + ID + "'s Name Is " + Name
                + "\nTheir Age Is " + Age
                + "\nAmountDue: " + AmountDue.ToString("C") + "\n");
        }

        int IComparable.CompareTo(Object o)
        {
            int returnVal;
            Patient temp = (Patient)o;
            if (this.ID > temp.ID)
                returnVal = 1;
            else
                if (this.ID < temp.ID)
                    returnVal = -1;
                else
                    returnVal = 0;
            return returnVal;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Wrightstown Hospital Billing Department\n\n");
            InsuredPatient[] insuredPatient = new InsuredPatient[5];

            int x;
            int idNum;
            int pAge;
            double aDue;
            for (x = 0; x < insuredPatient.Length; x++)
            {
                insuredPatient[x] = new InsuredPatient();
                Console.WriteLine("Patient ID Number: ");
                Int32.TryParse(Console.ReadLine(), out idNum);
                insuredPatient[x].ID = idNum;
                Console.WriteLine("Patient Name: ");
                insuredPatient[x].Name = (Console.ReadLine());
                Console.WriteLine("Patient Age: ");
                Int32.TryParse(Console.ReadLine(), out pAge);
                insuredPatient[x].Age = pAge;
                Console.WriteLine("Amount Due: ");
                double.TryParse(Console.ReadLine(), out aDue);
                insuredPatient[x].AmountDue = aDue;
                Console.WriteLine("Name of Insurance Company: ");
                insuredPatient[x].InsuranceCompany = (Console.ReadLine());


            }
            Array.Sort(insuredPatient);
            Console.WriteLine("\nPatient Summary Sorted: \n");
            Console.WriteLine("-------------------------------\n");
            for (x = 0; x < insuredPatient.Length; ++x)
                Console.WriteLine(insuredPatient[x].ToString());
            Console.ReadLine();
        }


    }

}

The percentage is a string, which makes things a bit more difficult as you have to convert that to something you can use in a mathematical expression. Let's say InsurancePercent is of the form "###%". The process would be some variant of this:

var percent = Convert.ToDouble(patient.InsurancePercentage.TrimEnd('%'));
var insuredAmount = patient.AmountDue * (percent / 100);

Console.WriteLine("Insured Amount: " + insuredAmount);
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