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Classification and external resources
ICD-10 R73.9
ICD-9 790.29
DiseasesDB 6234
MedlinePlus 007228
MeSH D006943

Hyperglycemia means high blood sugar levels at or beyond 200 mg/dl. It is a serious and life threatening health problem that can be fatal if not properly treated in time. Extremely high blood sugar means diabetes mellitus, a condition that often causes extensive high blood sugar. Intermittent hyperglycemia may mean diabetes of any kind may be developing under low insulin levels or resistance to insulin.