ICD9International Classification of Diseases 9 (book)
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Exclusion criteria included patients aged < 18 or >89, a diagnosis of rheumatoid arthritis, posttraumatic arthritis or inflammatory arthritis of the knee (ICD9 714.x), previous total knee arthroplasty procedure, and patients undergoing revision arthroplasty or patients undergoing unicompartmental or patellofemoral joint arthroplasty.
Comorbidity status was based on having a documented condition in the respective medical conditions file, identified by ICD9 codes.
We used the top 15 ICD9 codes at discharge from each patient to classify the presence of ischemic heart disease (ICD9 410-414); ST-elevation MI (STEMI) (410 excluding 410.7); non-ST elevation MI (NSTEMI) (410.7); intermediate coronary syndrome (ICS/UA), which includes unstable angina, preinfarction angina, impending infarction, and preinfarction syndrome (411.1); or angina (413.9).
Making the switch from the ICD9 to the ICD-10 diagnosis code set could cost as much as $225,000 for some small practices and up to $8 million in some large practices, according to a study from the American Medical Association.
At present, Dubai hospitals use ICD9 disease codes while Abu Dhabi has already implemented ICD10 codes.
Inclusion criteria consisted of all inpatients aged 0-19 years and treated between 1992 and June 30, 2011, who had a principal ICD9 procedure code for correction of ureteropelvic junction (55.87) and principal ICD-9 diagnosis code for congenital obstruction of ureteropelvic junction (753.21).
The shift from International Classification of Diseases, Ninth Revision (ICD9) involves serious challenges, including transitioning from a system of 13,000 codes to a system of more than 68,000 codes in ICD10-CM.
Among the overall population of 1.6 million patients, approximately 61,400 had an ICD-9 code for diabetes mellitus (ICD9 250.x).
All patients with EHR diagnosis codes indicating a clinical diagnosis of alcohol abuse, ICD9 303 or ICD9 305.0, were also excluded.
An example of that is the ICD (International Classification of Diseases) glossary published by the WHO, where the ICD9 version holds a list of medical procedures which can be performed in a patient's treatment, and ICD-10 lists the possible names (diagnoses) of diseases.
The source of this information was the cause of death code (ICD9 185) as captured in the Ontario Cancer Registry.