CPT and HCPCS Level II Coding
Scope and structure
CPT codes describe outpatient procedures and services and are organized into six sections: Evaluation and Management (E/M), Anesthesia, Surgery, Radiology, Pathology and Laboratory, and Medicine. HCPCS Level II codes (beginning with a letter) cover supplies, drugs, durable medical equipment, and services not in CPT. Candidates must understand modifiers (e.g., -25 for significant, separately identifiable E/M; -59 for distinct procedural service; -LT/-RT for laterality) and add-on codes (never reported alone).
E/M and procedure reporting
Know the components of E/M selection under current guidelines: medical decision making or time, depending on the code set and setting. Understand global surgical packages and what is included (e.g., routine post-op care). Recognize bundled services and when modifier -25 or -59 is appropriate-and when it is not.
Traps to watch
- Reporting an E/M service with a procedure without a documented, separately identifiable reason (modifier -25 misuse).
- Using -59 to unbundle services that are truly bundled.
- Reporting add-on codes without their primary code.
- Confusing CPT and HCPCS Level II for drugs and supplies.
- Ignoring laterality modifiers when required.
Rule of thumb
If a service is integral to the procedure, it is not separately reportable. Modifiers explain why a service is distinct-not a tool to increase payment.
Worked example
A patient has a lesion removed and, during the same visit, a separately identifiable problem is evaluated. The E/M may be reported with modifier -25 only if the documentation supports a significant, separately identifiable service.