Outpatient CDI in the Emergency Department
Emergency department CDI covers professional and facility documentation in the ED, where rapid, episodic care creates high coding risk. The exam tests ED E/M medical decision making, critical care time, procedure documentation, high-risk diagnoses such as sepsis and respiratory failure, and medical necessity.
Core rules and concepts
- ED E/M codes 99281–99285 are based on medical decision making under the 2023 revisions: number and complexity of problems, data reviewed, and risk. Time is not a stand-alone ED E/M component.
- Critical care 99291/99292 requires direct delivery of critical care, high-complexity decision making, and documented time. The first hour is 30–74 minutes; each additional 30 minutes uses 99292.
- Procedures require specifics: wound repair length and site, laterality, foreign-body removal, conscious sedation, and whether the procedure was separate from the E/M.
- High-risk diagnoses need clinical support: sepsis requires suspected infection plus organ dysfunction; respiratory failure must be typed as acute, chronic, or acute-on-chronic; altered mental status needs underlying cause when known.
Worked example
A 72-year-old with COPD presents with fever, wheezing, and hypoxia. The note says “respiratory failure, COPD exacerbation.” The coder cannot tell whether the failure is acute, chronic, or acute-on-chronic, or whether it is hypoxic or hypercapnic. A query asks for the type of respiratory failure and the clinical indicators. The provider documents “acute on chronic hypercapnic respiratory failure due to COPD exacerbation.” The record now supports a more specific diagnosis and justifies the ED level and any critical care time. If critical care is billed, the note must also show 30 or more minutes of critical care delivery.
Traps that cost marks
- Billing critical care without documented time or critical care delivery.
- Selecting an ED E/M level not supported by MDM.
- Bundling a separately documented procedure into the E/M.
- Missing laterality or wound length in procedure notes.
- Using a past history of respiratory failure to support an acute diagnosis.