S63.501A Unspecified sprain of the right wrist, initial encounter. However, I would further query the provider to see if we could garner a little more specificity - ie, sprain of carpal joint, radiocarpal joint, etc. Happy Friday everyone!
Rationale: The Alphabetic Index main term is sprain, subterm wrist, resulting in S63.50-. The correct code is S63.501A with the sixth character for right wrist and the seventh character A for initial encounter.