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CPT 99213 and 99214 look nearly identical on paper — both are established patient office visits — but the difference between them is one of the most common sources of lost revenue in primary care and internal medicine billing. This 2026 guide breaks down exactly when each code applies, what documentation each one requires under current MDM guidelines, how the reimbursement compares, and the real-world scenario that trips up more practices than almost any other coding decision