The international classification of diseases ninth revision clinical modification icd 9 cm is based on the world health organizations ninth revision international classification of diseases icd 9 icd 9 cm is the official system of assigning codes to diagnoses and procedures associated with hospital utilization in the united states. International classification of diseases clinical modification icd 9 cm is an adaption created by the us national center for health statistics nchs and used in assigning diagnostic and procedure codes associated with inpatient outpatient and physician office utilization in the united states. The international classification of diseases ninth revision clinical modification icd 9 cm is the us health systems adaptation of international icd 9 standard list of six character alphanumeric codes to describe diagnoses. The first international classification edition known as the international list of causes of death was adopted by the international statistical institute in 1893 who was entrusted with the icd at its creation in 1948 and published the 6th version icd 6 that incorporated morbidity for the first time. Icd 9 volume 3 codes are 3 or 4 digits and appear in the format xxyz where the final digit is optional icd 10 icd 10 is the 10th version of the international classification of diseases and replaced icd 9 medical codes used to describe patient diagnoses and level of care in hospitals across the united states
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