AHA Coding Clinic® for ICD-9 - 1989 Third Quarter
Ill-Defined Descriptions and Complications of Heart Disease
Code Revisions Effective October 1, 1989 Category 429, Ill-defined descriptions and complications of heart disease, has been expanded to include a subdivision 429.7 to identify certain sequelae, such as acquired cardiac septal defect and mural thrombus following myocardial infarctions. These revisions are effective October 1, 1989. The revisions are as follows: 429 Ill-defined descriptions and complications of heart disease 429.7 Certain sequelae of myocardial infarction, not elsewhere classified Use additional code to identify the associated myocardial infarction: with onset of 8 weeks or less (410.00-410.92) with onset of more than 8 weeks (414.8) Excludes:...
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Article Overview
This article explains a revision to an ICD-9-CM heart disease category that became effective October 1, 1989. It is relevant to coders, auditors, and clinical documentation staff who work with cardiovascular diagnoses, myocardial infarction follow-up, and sequelae classification. The article covers the expanded subdivision structure, related exclusions, references to associated diagnosis coding, and illustrative examples showing how the revised category applies in post-infarction situations.
Why This Topic Matters
The revision changes how certain heart disease sequelae are classified and documented in ICD-9-CM, which can affect diagnosis selection, record clarity, and coding consistency for post-infarction cases.
Article Sections
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Code Revisions Effective October 1, 1989
Introduces the effective date and the ICD-9-CM category revision being discussed. Summarizes the scope of the update and the newly added subdivision within the heart disease category.
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Revised Category Structure and Exclusions
Outlines the revised category and subdivision structure for the heart disease code family. Includes references to associated exclusions and related diagnostic groupings mentioned in the update.
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Examples of Appropriate Use
Provides illustrative post-infarction scenarios showing how the revised category is applied in practice. The examples are presented as documentation and coding context for the updated classification.
What You Will Learn
- What ICD-9-CM heart disease category was revised and when the revision became effective.
- How the article frames the subdivision added for post-infarction sequelae.
- What types of related exclusions and associated diagnosis references are discussed.
- How the article presents example scenarios for revised classification of myocardial infarction sequelae.
Who Should Read This
- Medical coders
- Coding auditors
- Clinical documentation specialists
- Health information management professionals
- Billing staff working with cardiovascular diagnoses
Codes Discussed
Code Ranges Discussed
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