Convert to ICD-10-CM: 
840.5 converts approximately to:
- 2015/16 ICD-10-CM S43.80XA Sprain of other specified parts of unspecified shoulder girdle, initial encounter
 ICD-9-CM Volume 2 Index entries containing back-references to 
840.5:
- Sprain, strain (joint) (ligament) (muscle) (tendon) 848.9  subscapularis 840.5 subscapularis 840.5