ICD-10-CM 2018 Guidelines: Code-specific rules take precedence over ‘with’ convention

Why This Topic Matters

Keeping current with annual ICD-10-CM guideline revisions is essential for accurate diagnosis coding, compliant documentation review, and consistent application of chapter-specific rules. This article highlights updates that can affect how coders interpret documentation and apply official guidance across multiple diagnosis categories.

Article Sections

1. Overview of 2018 ICD-10-CM guideline changes

   Introduces selected updates in the 2018 official guidelines and explains that several chapter-level changes were added for the year. It frames the article as a summary of noteworthy revisions rather than a full guideline manual.

2. Documentation conventions and linking terms

   Covers changes to the general interpretation of relational terms in ICD-10-CM documentation and index references. The section also notes that code-specific guidance can override broader convention language.

3. Diabetes and long-term insulin use

   Summarizes an update in the diabetes guidance related to long-term therapy coding. It also mentions a clarification about temporary use during an encounter.

4. Pathological fracture treatment guidance

   Reviews a clarification in the fracture guidance concerning seventh character usage across different phases of care. The section addresses subsequent encounters and healing-related follow-up language.

5. Non-pressure chronic ulcer guidance

   Describes new chapter 12 guidance associated with the introduction of additional chronic ulcer codes. The update is presented as comparable in structure to existing ulcer guidance.

6. Z-code category updates

   Summarizes additions to selected chapter 21 category lists for Z codes. The section notes changes to history-related categories and first-listed diagnosis guidance.