In the database, patients with drug, chemical and unspecified poisoning (ICD-10 codes T360 T509, T510 T659 and T887, respectively) have the same major disease code (disease code 161070).
Ailments or descriptions that did not fall under any major disease group were coded under "Factors influencing health status and contact with health services" Z00-Z999 of ICD10).
According to the ICD-10 codes, 506 major disease categories were defined in 2008 (see online supplementary table S1).
Based on an analysis of survival of stroke patients following any readmission within Major Disease Category 5 (Diseases of the Circulatory System), twenty DRG codes with a mean 1-year mortality rate of 40% or greater were defined as non-fatal major cardiac events.
It is clear that even for a major disease such as ovarian cancer not all events are (or can be) coded at the time of definitive diagnosis or even at all.
Individual factors included the woman's age, wage, having prior pregnancy-associated hospitalizations (ICD-9-CM codes from 640 to 676 with a fifth digit of "0" or "3", or any diagnosis in combination with a code V22 (normal pregnancy) or V23 (high-risk pregnancy)), having a major disease card, and the previous year's inpatient expenses.
Bovine tuberculosis is a really major disease.
If there is a serious bias in the reporting of disease codes in outpatient and primary care, for example if alcohol related diseases are given a disease code to a lower extent than non-alcohol related diseases, this could have a major effect on the results of this study.
We used the primary ICD-10 diagnosis of the hospitalization to categorize patients into nine major disease groups: septicemia, other infectious disease, endocrine disease, cardiovascular disease, respiratory disease, gastrointestinal or liver disease, cancer, trauma or poisoning and other (please see Additional file 1 for the ICD-10 codes).
The CCI includes 19 major disease groups.
