Convert to ICD-10-CM: 
726.63 converts approximately to:
- 2015/16 ICD-10-CM M76.899 Other specified enthesopathies of unspecified lower limb, excluding foot
 ICD-9-CM Volume 2 Index entries containing back-references to 
726.63:
- Bursitis NEC 727.3  collateral ligament collateral ligament