ICD-10-CM diagnosis coding conventions, chapter structure, and coding guideline rules tested on the RHIA and RHIT exams.
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- How many characters can an ICD-10-CM code have?
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3 to 7 characters- What is the minimum number of characters required for a valid ICD-10-CM category code?
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3 characters- In ICD-10-CM, what does the seventh character often represent in injury and external cause codes?
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The episode of care (initial encounter, subsequent encounter, or sequela)- What placeholder character fills empty positions when a code needs a seventh character but doesn't yet have six characters?
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The letter X- What does "NEC" mean in ICD-10-CM?
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Not elsewhere classifiable- What does "NOS" mean in ICD-10-CM?
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Not otherwise specified- In ICD-10-CM, what does an "Excludes1" note mean?
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The excluded condition can never be coded together with the code above it- In ICD-10-CM, what does an "Excludes2" note mean?
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The excluded condition is not part of the condition represented, but a patient may have both, so both codes may be used together- What does the ICD-10-CM convention "code first" instruct a coder to do?
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Sequence the underlying condition before the code that carries this note- What does the ICD-10-CM convention "use additional code" instruct a coder to do?
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Add a secondary code to fully describe the condition, sequenced after the primary code- In ICD-10-CM, what do square brackets [ ] enclose?
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Synonyms, alternative wording, or explanatory phrases- In ICD-10-CM, what do parentheses ( ) enclose?
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Supplementary words (nonessential modifiers) that do not affect code selection- In the ICD-10-CM Tabular List, what does a colon after a term mean?
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The term is incomplete until modified by one of the terms listed after it- When an ICD-10-CM title links two conditions with "and," such as "acute and chronic," what does that mean for code use?
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The title covers either condition alone or both together- Which ICD-10-CM chapter covers codes for external causes of injury (V, W, X, Y codes)?
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Chapter 20, External Causes of Morbidity
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