Strain of intrns musc/fasc/tend thmb at wrs/hnd lv, sequela

This code signifies a chronic or late-effect injury involving the intrinsic muscles, fascia, or tendons within an unspecified thumb, specifically at the wrist and hand level. This type of strain often results from repetitive stress or overuse, leading to persistent pain, weakness, or functional limitation long after the initial acute injury has healed.

Apply this code when documenting the long-term consequences or residual effects of a thumb intrinsic muscle, fascia, or tendon strain. This is appropriate for patients presenting with chronic pain, stiffness, or decreased range of motion in the thumb that is directly attributable to a past strain, and where the acute phase of the injury has resolved.

• Requires a seventh character "S" to indicate sequela, meaning the condition is a late effect of a previous injury.
• Use when the specific thumb (right or left) is not documented or cannot be determined.
• Do not use for acute or initial encounters of a thumb strain; those would require an "A" or "D" seventh character.