Monoclonal gammopathy of undetermined significance Tags: Disease.Monoclonal gammopathy of undetermined significance (MGUS unknown or uncertain may be substituted for undetermined) formerly benign monoclonal gammopathy is a condition in which a paraprotein is found in the blood during standard laboratory tests. thumbnail DiseasesDB 1341 eMedicine subject med, 1495 ICD10 D47.2 ICD9 273.1 ICDO 9765/1 MeSH ID D008998 Learn more... Loading...