International Classification of Diseases 9th Edition (ICD-9)

ICD-9-CM Tabular List
The disease tabular list is also known as Volume II of ICD-9. This sections contains the Tabular List to ICD-9-CM diseases and related health problems, a chronological list of codes divided into chapters based on body system or condition.
ICD-9-CM Index
The Disease Index (Alphabetic) is also known as Volume I of ICD-9. This section contains the alphabetical index to ICD-9-CM diseases and related health problems. This alphabetic index is arranged by condition. Conditions may be expressed as nouns, adjectives, and eponyms. Some conditions have multiple entries under their synonyms.
ICD-9 External Causes Of Injury
This section contains the index to the ICD-9 codes which classify environmental events, circumstances, and other conditions as the cause of injury and other adverse effects. The alphabetic index to the E codes is organized by main terms which describe the accident, circumstance, event, or specific agent which caused the injury or other adverse effect.
ICD-9 Drugs and Chemicals Table
This table contains a classification of drugs and other chemical substances to identify poisoning states and external causes of adverse effects. Each of the listed substances in the table is assigned a code according to the poisoning classification (960-989). These codes are used when there is a statement of poisoning, overdose, wrong substance given or taken, or intoxication.
ICD-9-CM to ICD-10-CM Conversion/General Equivalence Mappings (GEMS)
This is a great tool that you can use to convert data from ICD-9-CM to ICD-10-CM and vice versa. The GEMs are also known as crosswalks as they provide important information linking codes of one system with codes in the other system. The GEMs are a comprehensive translation dictionary that can be used to accurately and effectively translate any ICD-9-CM-based data.