CPT code (Current Procedural Terminology)
A five-digit numeric code maintained by the American Medical Association that identifies a specific medical, surgical, or diagnostic service. CPT codes are the language payers use to determine what you get paid. Every billable service you provide maps to at least one CPT code, and the code determines the reimbursement amount under each payer contract.
Why this matters for your clinic
CPT codes are the foundation of your revenue. The wrong code on a claim can mean an underpayment, a denial, or in serious cases a compliance problem. Upcoding (billing a higher-intensity service than was actually documented) is a major audit trigger. Downcoding (billing a lower-intensity service than the documentation supports) is money left on the table voluntarily.
Most clinic owners trust their billers to handle CPT selection, which is reasonable. But understanding the codes that drive the majority of your revenue gives you the context to ask the right questions. If your average reimbursement per visit is drifting down, the first place to look is whether your coding profile has shifted, not just whether payer rates changed.
Documentation drives coding. Providers who document thoroughly and accurately can support higher-level codes. Providers who document minimally will be coded conservatively, often leaving real revenue behind. A coding review of 50 randomly selected charts can reveal in a few hours how much a practice is systematically under-documenting.
What good looks like
The AMA publishes the CPT code set annually with annual updates taking effect on January 1. CMS uses CPT codes as the foundation for the Medicare Physician Fee Schedule. Commercial payers build their own contracted rates on top of CPT code structures, which is why the same CPT code may reimburse very differently across your payer mix.
Example
A physical therapy practice bills CPT 97110 (therapeutic exercise) and CPT 97140 (manual therapy) for most visits. If the therapist performs 30 minutes of each, the correct coding is two units of 97110 and two units of 97140, assuming the documentation supports both time and medical necessity. If the biller defaults to one unit of each to avoid scrutiny, the practice is routinely collecting roughly half the legitimate reimbursement on every visit.
From Sorso
In the RCM reviews we do, CPT coding accuracy is one of the first things we check because it is where honest errors are most common and most costly. A systematic downgrade by just one level on evaluation and management visits can represent tens of thousands of dollars per provider per year.
Founder of Sorso. 19 years in corporate finance. Managed a $450M loan portfolio before building a fractional CFO firm exclusively for healthcare clinics.
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