| COI | Central Obesity Index; certificate of insurance; cost of illness |
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| CSI | calculus surface index; cancer serum index; cavernous sinus infiltration; cervical spine injury; che... |
| HIP | health illness profile; health insurance plan or program; homograft incus prosthesis; hospital insur... |
| HOPI | history of present illness |
| HPI | hepatic perfusion index; history of present illness |
| illness, acute | An illness with an abrupt onset and usually a short course. (12 Dec 1998) |
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| illness, chronic | An illness that has persisted for a long period of time. It is a continuing disease process. (12 Dec 1998) |
| environmental illness | A polysymptomatic condition believed by clinical ecologists to result from immune dysregulation induced by common foods, allergens, and chemicals, resulting in various physical and mental disorders. The medical community has remained largely skeptical of the existence of this "disease", given the plethora of symptoms attributed to environmental illness, the lack of reproducible laboratory abnormalities, and the use of unproven therapies to treat the condition. (12 Dec 1998) |
| functional illness | A physical disorder with no known or detectable organic basis to explain the symptoms. See: behaviour disorder, neurosis. Synonym: dynamic disease, functional disease, functional illness. (05 Mar 2000) |