Mech loosening of unsp internal prosthetic joint, sequela

This code indicates a long-term complication where an unspecified internal prosthetic joint has become mechanically loose. This loosening is not an acute event but rather a residual effect or condition resulting from the initial loosening.

Use this code when documentation specifies mechanical loosening of a prosthetic joint, but the specific joint (e.g., hip, knee) is not identified, and the encounter is for treatment of the sequela. This applies to follow-up visits or ongoing management of the chronic loosening.

• Ensure the documentation clearly states "mechanical loosening" and that the specific joint is not identified.
• The "S" in the seventh character indicates sequela, meaning this code is for conditions that are the late effects of the initial loosening.
• Do not use for acute or initial episodes of mechanical loosening; those would require an initial or subsequent encounter seventh character.