Rupture of synovium, unspecified finger(s)

This code describes a tear or break in the synovial membrane surrounding the joint or tendon sheath of an unspecified finger. This injury can result in pain, swelling, and impaired finger movement due to the disruption of the lubricating fluid-producing tissue.

Use this code when documentation specifies a rupture of the synovium affecting one or more fingers, but the specific finger (e.g., thumb, index) is not identified. This typically applies to acute traumatic injuries or spontaneous ruptures. Documentation should clearly state "rupture of synovium" and indicate the affected area as "finger(s)" without further specificity.

• Do not use if a specific finger is documented (e.g., thumb, index finger); instead, select a more specific code from the M66.1- series.
• Ensure the documentation explicitly states "rupture" of the synovium, not just inflammation (synovitis) or other synovial disorders.
• Consider an external cause code (V00-Y99) if the rupture is due to an external cause, such as trauma.