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Thursday, May 2, 2019

The International Classification of Diseases (ICD)


By: Lourie W. Reichemberg

Most of the world already uses ICD-10 to classify diseases and other health problems, to code health records and death certificates, and to capture national morbidity and mortality statistics. The ICD-10 has been translated into 43 languages and is used by 117 countries.

Within the United States, the ICD-9-CM (Clinical Modification) is the current version officially used for coding and billing purposes. This is a modified version of WHO’s ICD codes created by the U.S. National Center for Health Statistics (NCHS) and the Centers for Medicare and Medicaid Services (CMS). The CM versions provide additional detail and are used specifically for medical coding and reporting in the United States (American Psychological Association, 2012).

On October 1, 2014, all U.S. healthcare providers covered under the Healthcare Insurance Portability and Accountability Act (HIPAA) must begin to use the ICD-10-CM diagnosis codes. The ICD provides the code numbers but limited diagnostic information. On the other hand, DSM-5 provides more specific and detailed diagnostic criteria and cross-cutting measures to help the clinician make that diagnostic determination. The complete listing of ICD codes is available for use free of charge from the WHO website: www.who.int/classifications/icd/en

A Brief History of the ICD

The ICD has been the standard diagnostic tool for more than 150 years. It is used to monitor the incidence and prevalence of diseases and other health problems worldwide. This includes epidemiology, health management, clinical purposes, and analysis of the general health situation of population groups.


The ICD system began in the 1850s with the publication of the International List of Causes of Death by the International Statistical Institute. This list, which reported causes of morbidity and mortality, was taken over by the World Health Organization (WHO) in 1948, when the sixth revision was published.

In 1977, the ICD-9 codes were published and are still being used, although the ICD-10 codes were approved in 1990 and came into use in 1994 (WHO, 2010). Most countries are already using the ICD-10 coding system; only a few (e.g., the United States, Italy) have yet to switch over. The U.S. Department of Health and Human Services has mandated October 1, 2014 as the deadline for switching over to the ICD-10-CM for diagnostic code reporting across all of health care, and the implementation of ICD-10-PCS (Procedural Coding System) for inpatient procedural reporting for hospitals and payers.

Overall, the number of codes will increase from 17,000 codes currently in ICD-9 to more than 141,000 codes for different medical diagnoses and procedures with the implementation of ICD-10.

Although the primary purpose of the ICD is to code and record causes of mortality and morbidity (disease or illness), for the most part, those who are responsible for mental health diagnosis and coding will be interested in only a small section of the four-volume series put out by WHO: The ICD-10 Classification of Mental and Behavioural Disorders.

A Few Facts to Keep in Mind About ICD Codes

Every edition of the DSM has supplied ICD codes. All of the DSM-IV code numbers are ICD-9 codes. So if you look up PTSD in DSM-IV, it will have the same code number as DSM-5. ICD-10-CM is not just an update to the ICD-9-CM codes. ICD-10-CM follows a new alphanumeric coding scheme, and therefore the codes cannot be converted. The ICD-10 reminds us that no classification system is ever perfect, that this and other documents used for diagnosis are always evolving, and that diagnosis requires judgment and clinical experience. Readers may want to check errata sheets for ICD-10 and code revisions for DSM-5 at www.DSM5.org. Corrections through October 1, 2013, have been made to this text, so readers should be aware that, in some cases, codes in this book differ from those published in the DSM-5.

CONCLUSION

It is beyond the scope of this introduction to include a complete assessment of the evolution of the Diagnostic and Statistical Manual of Mental Disorders. Interested readers will find such history in the introductory pages of DSM-5.

The takeaway message clinicians need to know to conduct a diagnosis using the DSM-5 classification system is the same guidance they have used in the past: A comprehensive clinical assessment must include a complete biopsychosocial assessment of factors that have contributed to, and that continue tsustain, the mental disorder. The underlying goal is to conduct an accurate diagnosis so that the appropriate evidence-based treatment can begin.

References

Lourie W. Reichemberg, DSM-5™ Essentials The Savvy Clinician’s Guide to the Changes in Criteria, 2014 by John Wiley & Sons, Inc

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