Persistent refusal to accept medical advice that there is no adequate physical cause for the symptoms or physical abnormality, except for short periods of up to a few weeks at a time immediately after or during medical investigations.D. Most commonly used exclusion criteria: not occurring only during any of the schizophrenia and related disorders (F20–F29, particularly F22) or any of the mood disorders (F30–F39).The DSM-IV defines hypochondriasis according to the following criteria:

A. Preoccupation with fears of having, or the idea that one has, a serious disease based on the persons misinterpretation of bodily symptoms. B. The preoccupation persists despite appropriate medical evaluation and reassurance. C. The belief in Criterion A is not of delusional intensity (as in Delusional Disorder, Somatic Type) and is not restricted to a circumscribed concern about appearance (as in Body Dysmorphic Disorder). D. The preoccupation causes clinically significant distress or impairment in
social, occupational, or other important areas of functioning. E. The duration of the disturbance is at least 6 months. F. The preoccupation is not better accounted for by Generalized Anxiety Disorder, Obsessive-Compulsive Disorder, Panic Disorder, a Major Depressive Episode, Separation Anxiety, or another Somatoform Disorder. In the fifth version of the DSM (DSM-5), most who met criteria for DSM-IV hypochondriasis instead meet criteria for a diagnosis of somatic symptom disorder (SSD) or illness anxiety disorder (IAD). Classification
The classification of hypochondriasis in relation to other psychiatric disorders has long been a topic of scholarly debate and has differed widely between different diagnostic systems and influential publications.
XVI edited by William Torrey Harris p. 395-396

See also
References
Further reading
External links
Hypochondriasis at Curlie