The assessment of disability and occupational invalidity is a critical process in many legal and social security systems worldwide. In Colombia, this process is meticulously defined by specific legal frameworks, among which Decree 917 of 1999 stands as a cornerstone. This decree establishes the Single National Manual for the Qualification of Invalidity, providing a standardized methodology for medical-legal professionals to determine the percentage of loss of working capacity due to various health conditions. This comprehensive guide delves into Chapter III, focusing specifically on the general aspects of Rheumatology, a field that presents unique challenges in disability assessment due to the chronic, progressive, and often systemic nature of its diseases. The objective of this section is to provide a detailed understanding of how rheumatic conditions are evaluated under this Colombian legal instrument. It outlines the general principles, classifications, and specific criteria us...