РІР‚вЂ№ (Fig.1): 1): (1) chronic primary pain, (2) chronic cancer pain, (3) chronic posttraumatic and postsurgical pain, (4) chronic neuropathic pain, (5) chronic headache and orofacial pain, (6) chronic visceral pain, and (7) chronic musculoskeletal pain. These disorders were divided into 7 groups (Fig. The new ICD category for РІР‚СљChronic PainРІР‚Сњ comprises the most common clinically relevant disorders. Each diagnosis retains 1 category as primary parent, but is cross-referenced to other categories that function as secondary parents. Developing this multilayered classification was greatly facilitated by a novel principle of assigning diagnostic codes in ICD-11, termed РІР‚Сљmultiple parenting.РІР‚Сњ Multiple parenting allows the same diagnosis to be subsumed under more than 1 category (for a glossary of ICD terms refer to Table РІР‚вЂ№ Table1).

The IASP Task Force decided to give first priority to pain etiology, followed by underlying pathophysiological mechanisms, and finally the body site. This problem is not unique to the classification of pain, but exists throughout the ICD. Some diagnoses of pain defy these classification principles (fibromyalgia). Pain categories are variably defined based on the perceived location (headache), etiology (cancer pain), or the primarily affected anatomical system (neuropathic pain). The goal is to create a classification system that is applicable in primary care and in clinical settings for specialized pain management.Р”Р„ major challenge in this process was finding a rational principle of classification that suits the different types of chronic pain and fits into the general ICD-11 framework. The IASP Task Force, which comprises pain experts from across the globe, 19 has developed a new and pragmatic classification of chronic pain for the upcoming 11th revision of the ICD. Responding to these shortcomings, the International Association for the Study of Pain (IASP) contacted the WHO and established a Task Force for the Classification of Chronic Pain. Consequently, the current lack of adequate coding in the ICD makes the acquisition of accurate epidemiological data related to chronic pain difficult, prevents adequate billing for health care expenses related to pain treatment, and hinders the development and implementation of new therapies.

In addition, ICD codes are commonly used to report target diseases and comorbidities of participants in clinical research. The ICD is the preeminent tool for coding diagnoses and documenting investigations or therapeutic measures within the health care systems of many countries. The current version of the International Classification of Diseases ( ICD) of the World Health Organization (WHO) includes some diagnostic codes for chronic pain conditions, but these diagnoses do not reflect the actual epidemiology of chronic pain, nor are they categorized in a systematic manner. 25, 28 Chronic pain should receive greater attention as a global health priority because adequate pain treatment is a human right, and it is the duty of any health care system to provide it. 29 Chronic pain is a frequent condition, affecting an estimated 20% of people worldwide 6, 13, 14, 18 and accounting for 15% to 20% of physician visits. 35 Usually pain is regarded as chronic when it lasts or recurs for more than 3 to 6 months. Chronic pain has been recognized as pain that persists past normal healing time 5 and hence lacks the acute warning function of physiological nociception.

Cid new episode feb 2017 this week full