2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Supplementary Classification Of Factors Influencing Health Status And Contact With Health Services V01-V85 > Persons With Potential Health Hazards Related To Communicable Diseases V01-V09 > Infection With Drug-Resistant Microorganisms V09.* > 2006 ICD-9-CM Diagnosis V09.9 Infection with drug-resistant microorganisms unspecified View the most recent version of ICD-9-CM V09.9 Diminished or failed response of an organism, disease or tissue to the intended effectiveness of a chemical or drug. It should be differentiated from DRUG TOLERANCE which is the progressive diminution of the susceptibility of a human or animal to the effects of a drug, as a result of continued administration. Diminished or failed response of an organism, disease, or tissue to the intended effectiveness of a chemical or drug. Mechanisms, functions, activities, or processes exhibited by pathogens to withstand previously toxic drugs. OBSOLETE (was not defined before being made obsolete). Reference(s): GO:curators V09.9 is a non-specific code that cannot be used to specify a diagnosis View the ICD-9-CM Volume 1 V09.* hierarchy Alternate Terminology Drug resistance NOS