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Table 4 Causes of hospitalization when rheumatoid arthritis was not coded as the main diagnosis

From: Hospitalization burden and comorbidities of patients with rheumatoid arthritis in Spain during the period 2002–2017

ICD-9-MC codesN%
1. Infectious and parasitic diseases (001–139)74472.61%
2. Neoplasms (140–239)20,5147.19%
3. Endocrine, metabolic, and nutritional diseases and immune disorders (240–279)55001.93%
4. Diseases of the blood and haematopoietic organs (280–289)54341.90%
5. Mental, behavioural and neurodevelopmental disorders (290–319)24290.85%
6. Diseases of the nervous system and the sense organs (320–389)67262.36%
7. Diseases of the circulatory system (390–459)54,12318.97%
8. Diseases of the respiratory system (460–519)49,87617.48%
9. Diseases of the digestive system (520–579)31,86411.17%
10. Diseases of the genitourinary system (580–629)15,6755.49%
11. Complications of pregnancy, childbirth and puerperium (630–679)34661.21%
12. Diseases of the skin and subcutaneous tissue (680–709)49151.72%
13. Diseases of the osteomyoarticular system and connective tissue (710–739)32,00311.21%
14. Congenital anomalies (740–759)3830.13%
15. Signs, symptoms and ill-defined states (780–799)12,3854.34%
16. Injuries and poisoning (800–999)27,5799.66%
17. Factors that influence the state of health and contact with health services (V01-V89)49221.72%
18. Lost to follow-up (ZZZ.ZP)1400.05%
Total285,381100%