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Understanding how length of time factors into the billing of an E/M code is a perpetual point of confusion in the coding world. Failing to code time correctly can result in third-party payers not reimbursing your practice appropriately-or sometimes not at all. So it's vital that your billers and coders (or whomever at your practice does the coding and billing) understand the three kinds of time that all third-party insurances should pay (see below for all seven E/M code elements).