ST Elevation and Non-ST Elevation Myocardial Infarction

Why This Topic Matters

Accurate interpretation of myocardial infarction documentation affects diagnosis coding specificity and supports consistent use of ICD-9-CM category 410. The topic is especially relevant when the record uses STEMI, NSTEMI, nontransmural, or nonspecific MI language, or when ST-segment elevation appears without a confirmed acute MI.

Article Sections

1. Effective October 1, 2005 update

   Introduces a coding update tied to category 410 and the addition of inclusion terms. The section frames the discussion around revised myocardial infarction terminology.

2. STEMI and NSTEMI terminology

   Describes the broad clinical distinction between ST elevation and non-ST elevation myocardial infarction. It also explains the article’s emphasis on how these terms relate to ECG findings and myocardial involvement.

3. ICD-9-CM category 410 overview

   Summarizes how the ICD-9-CM myocardial infarction category is structured by site. The section outlines the general relationship between coded categories and MI documentation language.

4. Coding guidance and documentation scenarios

   Addresses general documentation situations involving site specificity, unspecified documentation, and changes in clinical terminology over time. It also notes that the article discusses ST-segment elevation findings that are not necessarily acute myocardial infarction.

5. ICD-9-CM 410 code listing

   Presents the category 410 code list and its major grouped subcategories. The section serves as a reference overview for the myocardial infarction coding family.

6. Coding example and question

   Includes a brief clinical scenario and a question about code assignment. The example provides context for how the topic is applied in practice.