Table 2. Examples of mapping of Read codes to ICD10-CM codes.

Mapping is performed manually or automatically using TRUD dictionary.

Read code, version and description*	ICD10-CM code and description mapped manually	ICD10-CM code and description mapped by TRUD
3/B3030 Malignant neoplasm of rib	C413 Malignant neoplasm of ribs, sternum and clavicle
3/B7658 Benign neoplasm of perianal skin	D235 Other benign neoplasm of skin of trunk
3/E2745 Jet lag–disorder	F518 Other sleep disorders not due to a substance or known physiological condition
3/J07y2 Submandibular sialectasia	K118 Other diseases of salivary glands
3/Xa5et Nizatidine allergy	Z888 Allergy status to other drugs, medicaments and biological substances
3/F4A.. Keratitis &/or keratoconjunctivitis	H169 Unspecified keratitis, H16209 Unspecified keratoconjunctivitis, unspecified eye
3/K1632 Diverticulitis of bladder	N323 Diverticulum of bladder, Q646 Congenital diverticulum of bladder
2/J570. Anal and rectal polyp	K620 Anal polyp, K621 Rectal polyp
3/66AJ0 Chronic hyperglycaemia	R739 Hyperglycemia, unspecified
3/G2y.. Other specified hypertensive disease	I158 Other secondary hypertension
3/A56.. Rubella	B069 Rubella without complication
3/FyuQ. [X]Diseases of inner ear	H80-H83 Diseases of inner ear
3/X78O6 Tumor of descending colon	D124 Benign neoplasm of descending colon, C186 Malignant neoplasm of descending colon	D489 Neoplasms of uncertain or unknown behavior, unspecified
3/Xa2Tq Dog bite of foot	W540XXA Bitten by dog, initial encounter	S913 Open wound of other parts of foot, S917 Multiple open wounds of ankle and foot
2/SN580 Egg allergy	Z91012 Allergy to eggs	T781 Other adverse food reactions, not elsewhere classified
2/A0762 Enteritis due to rotavirus	A080 Rotaviral enteritis	A080 Rotaviral enteritis, J108 Influenza with other manifestations, influenza virus identified, J118 Influenza with other manifestations, virus not identified

* 3/ or 2/ denotes v3 or v2 of the Read code.