CEDC common mistakes
CEDC · Understand the traps and how to avoid them.
Selecting an emergency department E/M level based on the number of diagnoses or the patient's acuity rather than using the 2023 AMA/ CMS MDM or time-based criteria, and applying the wrong level.
Candidates often rely on the old 1995/1997 documentation guidelines or on the severity of the patient's condition (e.g., 'critical' patient) to choose a level, ignoring the current MDM elements (problems, data, risk) or total time on the date of the encounter.
What to do instead
Always determine the E/M level using the 2023 AMA MDM table (two of three elements) or total time when counseling/coordination dominates. For ED visits, use the ED-specific MDM table (99281-99285) and remember that time is not a component for ED levels. Practice by mapping sample notes to the MDM table.
Assigning a diagnosis code for a symptom (e.g., abdominal pain) when a definitive diagnosis was made and documented in the ED record.
Coders may default to the presenting symptom because it is prominent in the note, or they may be uncertain about the definitive diagnosis and choose the symptom to avoid querying.
What to do instead
Review the entire record for the final documented diagnosis. If a definitive diagnosis is present, code it as the principal diagnosis. Use symptom codes only when no definitive diagnosis is established. When documentation is unclear, query the provider.
Coding wound repair by the length of the wound before debridement or by the number of sutures, rather than using the final repaired length and the correct complexity (simple, intermediate, complex) based on the layers repaired and the degree of difficulty.
Candidates often focus on the initial wound size or the number of sutures, and they misinterpret the complexity definitions, especially for intermediate vs. complex repairs.
What to do instead
Measure the final repaired length (after any debridement) and sum lengths for multiple wounds of the same complexity and site. Determine complexity by the layers involved: simple = epidermis/dermis; intermediate = layered closure or extensive cleaning; complex = involving deeper structures or requiring extensive undermining. Refer to CPT guidelines for repair.
Billing fracture care (e.g., 2xxxx codes) for a closed reduction with splinting when the provider only applied a splint without reduction, or billing both fracture care and a splint application without modifier 50 or 51 as appropriate.
Candidates confuse fracture care (which includes application of the initial cast/splint) with splinting alone, and they may not know that fracture care codes include the initial immobilization, so separate splint codes are not billable unless a significant separately identifiable service is performed.
What to do instead
If the provider performs a closed reduction and applies a splint, code the fracture care (e.g., 25600 for distal radius fracture) and do not separately code the splint. If only splinting is done without reduction, code the splint (e.g., 29125). For multiple procedures, apply modifier 51 or 59 as appropriate. Review NCCI edits.
Omitting modifier 25 on an E/M service when a significant, separately identifiable E/M is performed on the same day as a procedure (e.g., wound repair, fracture care).
Candidates may think the E/M is always bundled with the procedure, or they may not recognize that the E/M is separately reportable when it is above and beyond the procedure.
What to do instead
Append modifier 25 to the E/M code when the E/M is significant and separately identifiable from the procedure. Ensure the documentation supports a distinct E/M service. Do not use modifier 25 if the E/M is solely for the procedure.
Using an unspecified diagnosis code (e.g., 'unspecified injury of knee') when a more specific code is available from the documentation (e.g., 'sprain of anterior cruciate ligament of right knee').
Candidates may not read the full note or may not be familiar with the specificity in ICD-10-CM, leading to unspecified codes that are often rejected or downcoded.
What to do instead
Always code to the highest level of specificity supported by the documentation. Review the note for details such as laterality, specific site, type of injury, and encounter type. Use unspecified codes only when the documentation does not provide enough detail. Query the provider if needed.
Failing to assign the correct external cause code (e.g., W00-W19, V00-Y99) for an injury or poisoning, or assigning an external cause code when not required.
Candidates may overlook external cause codes or may not know when they are required (e.g., for injuries, poisonings, adverse effects). They may also forget to sequence them properly.
What to do instead
For initial encounters for injuries, assign the appropriate external cause code as a secondary diagnosis. Ensure the external cause code matches the mechanism and intent. For subsequent encounters, external cause codes are not required. Review ICD-10-CM Chapter 20 guidelines.
Coding for a procedure that was not performed or was performed by another provider (e.g., coding for a laceration repair done by a physician assistant when the ED physician only evaluated the patient).
Candidates may assume the ED physician performed all services, or they may not check the documentation for who performed the procedure.
What to do instead
Verify the provider who performed the procedure and ensure the code is assigned to that provider. If the ED physician did not perform the procedure, do not code it for them. Use modifiers (e.g., -52, -53) if the procedure was discontinued or reduced.
Misusing modifier 59 or the X{EPSU} modifiers to bypass NCCI edits without meeting the criteria for a distinct procedural service.
Candidates may use modifier 59 indiscriminately to unbundle services that should be bundled, leading to compliance risks.
What to do instead
Use modifier 59 or X{EPSU} only when the service is distinct and independent from other services performed on the same day. Ensure documentation supports separate sites, lesions, or procedures. Prefer X{EPSU} modifiers when applicable (XE, XS, XP, XU).
Incorrectly coding for respiratory or cardiovascular procedures (e.g., intubation, CPR, cardioversion) by using the wrong code or missing that the procedure is included in another service.
Candidates may confuse similar procedures (e.g., intubation vs. ventilation) or may not know that certain procedures (e.g., CPR) are bundled with E/M services or are not separately reportable in some circumstances.
What to do instead
Review CPT codes for respiratory and cardiovascular procedures (e.g., 31500 for intubation, 92950 for CPR, 92960 for cardioversion). Check NCCI edits and CPT guidelines for bundling. For CPR, note that it is separately reportable when performed in the ED, but not with certain critical care codes.