Unspecified sprain of unspecified thumb, subs encntr

This code indicates a sprain of an unknown thumb, where the specific ligament or joint involved is not documented. It is used for encounters following the initial treatment of the injury.

Apply this code when a patient presents for follow-up care, such as a re-evaluation or physical therapy, for a thumb sprain where the laterality (left or right) and specific anatomical site of the sprain were not specified in the initial diagnosis. This code is appropriate when the documentation clearly states a subsequent encounter for an unspecified thumb sprain.

• Ensure documentation explicitly states "subsequent encounter" for this code to be appropriate.
• Avoid using this code if the laterality (left or right thumb) or the specific joint/ligament sprained is known; instead, use a more specific code.
• If this is the initial encounter for an unspecified thumb sprain, use the corresponding "A" (initial encounter) code.