Case Study: Think Principal Diagnosis Is Enough? Think Again

Why This Topic Matters

Incomplete or incorrectly sequenced diagnosis reporting can change how a surgical encounter is represented and whether all relevant patient conditions are captured. The article helps readers understand the broader ICD-9 context for coding encounters with coexisting conditions and historical findings.

Article Sections

1. Select Principal Diagnosis or First Listed

   Introduces the role of the primary diagnosis for a surgical encounter and explains how inpatient and outpatient ICD-9 guidance frame the first-listed condition.

2. Identify Coexisting Conditions

   Covers the need to report additional documented conditions that may affect patient care during the encounter and discusses how coexisting diagnoses are considered.

3. Keep History in the Past

   Addresses how resolved or previously treated conditions are treated in ICD-9 and distinguishes current conditions from historical ones.

4. Pay Attention to Sequencing

   Reviews the ordering of multiple diagnoses and the general approach to sequencing the primary condition with additional documented conditions.