ICD 9 CM Code Set
Case2Code offers a complete ICD-9-CM solution, providing official descriptions, structured hierarchy navigation, crosswalks to ICD-10-CM & HCPCS, and historical updates—ensuring compliance and accuracy for legacy data.

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ICD 9 Code Set
What’s Included?
The ICD-9-CM Code Set on Case2Code ensures that coders, billers, and researchers can retrieve, compare, and analyze legacy coding data.
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Access accurate, detailed ICD-9-CM definitions for historical reference.
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Read simplified descriptions to make complex codes easier to interpret.
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View short descriptions and classification details for ICD-9-CM codes.
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Navigate the ICD-9-CM structure with categorized breakdowns for neoplasms, diseases, and conditions.
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Track ICD-9-CM changes, previous descriptions, and classification updates over time.
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Seamlessly convert ICD-9-CM codes into ICD-10-CM and HCPCS equivalents for modern billing and compliance.
Trusted by Over 140,000 Medical Professionals & Organizations
Number of Active Monthly Users
- 140,000
Codes in our Databse
- 230,000
Faster Coding Workflows
- 36%
Reduce in Denials
- 42%
Benefits
Why Case2Code is the Best ICD-9-CM Coding Resource
Healthcare professionals and researchers trust Case2Code for historical ICD-9-CM data, ensuring accuracy and smooth transitions to ICD-10-CM and HCPCS.
- Easily Convert ICD-9-CM Codes to ICD-10-CM & HCPCS
Use our crosswalks to map ICD-9-CM to ICD-10-CM & HCPCS for compliance.
- Accurate Data for Claims & Audits
Quickly retrieve legacy codes for audits, appeals, and historical claim analysis.
- Structured Hierarchical Navigation
Navigate ICD-9-CM’s categorized system with clear sections and classifications.
- Track Legacy Code Changes
Review historical ICD-9-CM versions and classification updates for accurate reporting.
- Save & Organize Notes for Reference
Attach personal documentation and research notes to ICD-9-CM codes for future use.
- Fast & Reliable Search Tools
Locate ICD-9-CM codes instantly with advanced filtering and hierarchy-based navigation.
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- Search & Filters
- Lay Term Descriptions
- Crosswalk & Mappings
- Code Data Insights
- Modifier Assist
- Notes & Favorites
- History & Updates
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Frequently Asked Questions (FAQ) About The ICD-9-CM Code Set
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Case2Code provides official ICD-9-CM descriptions, historical classifications, structured hierarchy navigation, and crosswalks to ICD-10-CM & HCPCS.
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Easily navigate ICD-9-CM codes using categorized sections, classifications, and structured breakdowns for diseases and conditions.
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Yes! ICD-9-CM codes are mapped to ICD-10-CM and HCPCS to assist with legacy billing and compliance needs.