Appendix Table 1.

All Included Codes

Code ICD-10-D-S5330XA	International Classification of Diseases Traumatic rupture of unspecified ulnar collateral ligament initial encounter
Code ICD-10-D-S5330XD	Traumatic rupture of unspecified ulnar collateral ligament subsequent encounter
Code ICD-10-D-S5331XA	Traumatic rupture of right ulnar collateral ligament initial encounter
Code ICD-10-D-S5331XD	Traumatic rupture of right ulnar collateral ligament subsequent encounter
Code ICD-10-D-S5331XS	Traumatic rupture of right ulnar collateral ligament sequela
Code ICD-10-D-S5332XA	Traumatic rupture of left ulnar collateral ligament initial encounter
Code ICD-10-D-S5332XD	Traumatic rupture of left ulnar collateral ligament subsequent encounter
Code ICD-10-D-S5332XS	Traumatic rupture of left ulnar collateral ligament sequela
Code ICD-10-D-S53441A	Ulnar collateral ligament sprain of right elbow initial encounter
Code ICD-10-D-S53441D	Ulnar collateral ligament sprain of right elbow subsequent encounter
Code ICD-10-D-S53441S	Ulnar collateral ligament sprain of right elbow sequela
Code ICD-10-D-S53442A	Ulnar collateral ligament sprain of left elbow initial encounter
Code ICD-10-D-S53442D	Ulnar collateral ligament sprain of left elbow subsequent encounter
Code ICD-10-D-S53442S	Ulnar collateral ligament sprain of left elbow sequela
Code ICD-10-D-S53449A	Ulnar collateral ligament sprain of unspecified elbow initial encounter
Code ICD-10-D-S53449D	Ulnar collateral ligament sprain of unspecified elbow subsequent encounter
Code ICD-9-D-8411	Ulnar collateral ligament sprain

ICD, International Classification of Diseases.