M06: Other rheumatoid arthritis

M06.8: Other specified rheumatoid arthritis

Other specified rheumatoid arthritis (M06.8) refers to a specific type of inflammatory disorder that primarily affects the joints, but also possibly other parts of the body. This classification is used when the rheumatoid arthritis (RA) doesn't fit into the typical or most common RA categories, meaning it shows unique or unusual characteristics. Common symptoms across all types of RA include painful, swollen and stiff joints, often affecting the hands, feet, and wrists. Other specified RA may also come with additional or unique symptoms, like inflammation in other areas of the body, unusual patterns of joint involvement, or atypical lab test results. The exact cause of RA is unknown, but it's believed to involve a combination of genetic and environmental factors, possibly triggering an abnormal immune response. RA is a progressive disease, meaning it can worsen over time, leading to joint damage and disability.