Evaluating Billing Code Distributions in the Emergency Department Following the Implementation of the New...

Area of Science:

• Medical Billing and Coding
• Healthcare Policy
• Emergency Medicine

Background:

• Current Procedural Terminology (CPT) evaluation and management (E/M) documentation guidelines were revised on January 1, 2023.
• Previous E/M guidelines faced dissatisfaction, prompting changes.
• The impact of these revisions on billing distributions was previously unknown.

Purpose of the Study:

• To compare the proportion of E/M visits across different billing codes before and after the 2023 guideline changes.
• To determine the effect of the new CPT E/M documentation guidelines on billing distributions in emergency departments (EDs).

Main Methods:

• Retrospective, observational analysis of ED visits for adult patients across 5 EDs.
• Data collected from January 1 to March 31 for 2021, 2022, and 2023.
• Multivariate mixed-effect Poisson regression used to compare E/M code distributions pre- and post-guideline implementation.

Main Results:

• A significant increase in the proportion of visits coded as E/M level 4 (RR=1.40) and level 5 (RR=1.17) was observed post-implementation.
• The proportion of visits coded as E/M levels 1, 2, and 3 significantly decreased.
• No significant change was noted in critical care coding; similar trends were observed in academic and community EDs.

Conclusions:

• The implementation of new CPT E/M documentation guidelines led to an overall increase in E/M coding levels.
• These findings alleviate concerns that the documentation changes might negatively impact reimbursement.
• The study provides evidence of the real-world impact of E/M guideline revisions on ED billing practices.