Table 1.

ICD-10-CM and ICD-10 codes data summary.

		ICD-10-CMa (VUMCb)	ICD-10c (UKBBd)
Official classification systems
	Unique codes, n	94,201	12,027
	Unique codes mapped, n (%)	82,303 (87.37)	9,060 (75.33)
Official codes used in cohorts
	Unique codes, n	36,858	6,245
	Unique codes mapped, n (%)	34,793 (94.40)	5,823 (93.24)
Total patients (with ICD-10-CM or ICD-10 codes), n		651,649	391,181
Total instances of all ICDe codes, n		19,682,697	5,114,363
Instances mapped to phecodes, n (%)		17,658,470 (89.72)	4,279,544 (83.68)

^aICD-10-CM: International Classification of Diseases, 10th Revision, Clinical Modification

^bVUMC: Vanderbilt University Medical Center

^cICD-10: International Classification of Diseases, 10th Revision

^dUKBB: UK Biobank

^eICD: International Classification of Diseases