Toggle Menu

ICD-9-CM Code Set

The International Classification of Diseases (ICD) is the oldest method of tracking diseases and mortality in the world. It was first developed in Europe, and several versions have evolved over the years. The first edition, known as the International List of Causes of Death, was adopted by the International Statistical Institute in 1893. The current version used in the United States was established by the World Health Organization (WHO) and has seen regular modifications. ICD-9-CM (Clinically Modified) was adopted in United States in 1979. The code set is updated at least once a year, based on the input of providers, payers, and other key stakeholders. A new generation and much larger code set, ICD-10, will replace ICD-9 codes on Oct 1, 2015.

Already the standard for diagnostic and inpatient hospital coding in the United States, ICD-9-CM was mandated in 2003 by the Health Insurance Portability and Accountability Act of 1996 (HIPAA). A comprehensive understanding of the ICD-9-CM code set is essential for all medical coders and billers who work for health plans, healthcare clearinghouses, and healthcare providers transmitting any electronic health information.

The ICD-9-CM code set consists of:

  • Volume 1: The numeric listing of diseases, classified by etiology and anatomical system, along with as a classification of other reasons for encounters and causes of injury. This is called the tabular section of ICD-9-CM. Volume 1 is used by all health care providers and facilities.
  • Volume 2: The alphabetic index used to locate the codes in Volume 1. Volume 2 is used by all healthcare providers and facilities.
  • Volume 3: A procedural classification with a tabular section and an index. This set of procedure codes is used only by hospitals to report services.

All ICD-9-CM changes and modifications are the responsibility of the Centers for Disease Control (CDC), the National Center for Health Statistics (NCHS), and the Centers for Medicare & Medicaid Services (CMS).

See the full list of ICD-9 codes

Looking for ICD-9 Code Search?

Search across 4 medical code sets (CPT®, ICD-9, ICD-10, & HCPCS)

Become a Certified Medical Coder

Get your medical coding training and certification from the same trusted source

Order ICD-9 Books

Count on AAPC's ICD-9-CM books to help you choose and report the right ICD-9-CM code

Get Real-world Coding Experience

Improve coding skills across multiple specialties coding actual medical charts

Looking for Exhibiting Opportunities or Group Discounts?

Contact us at 877-524-5027.

Which certification is right for you?

Call 877-290-0440 or have a career counselor call you.

Which eNewsletters are right for you?

Call 844-334-2816 to speak with a specialist now.

Which books are right for you?

Call 877-524-5027 to speak to a representative.