| 3단위코드 | 3단위 분류 한글명칭 | 3단위 분류 영문명칭 | 4단위 분류코드수 |
| U코드 | | | 306 |
| U20-U33 | 한의병명(韓醫病名) | Disease Name of Oriental Medicine | 97 |
| U20-U21 | 전신질환 | General diseases | 12 |
| U22 | 정신 및 행동장애 | Mental and behavioral disorders | 3 |
| U23-U24 | 신경계통의 질환 | Diseases of the nervous system | 12 |
| U25 | 눈, 혀, 목구멍의 질환 | Diseases of eye, tongue, throat | 6 |
| U26 | 순환기계통의 질환 | Diseases of the circulatory system | 4 |
| U27 | 호흡기계통의 질환 | Diseases of the respiratory system | 8 |
| U28 | 소화기계통의 질환 | Diseases of the digestive system | 10 |
| U29 | 피부 및 피하조직의 질환 | Diseases of the skin and subcutaneous tissue | 8 |
| U30 | 근골격계 및 결합조직의 질환 | Diseases of the musculoskeletal system and connective tissue | 7 |
| U31 | 비뇨생식기계통의 질환 | Diseases of the genitourinary system | 10 |
| U32 | 여성비뇨생식기 및 분만관련 질환 | Diseases of the female genitourinary system and related to pregnancy | 8 |
| U33 | 발육지연, 발달장애 및 소아 청소년기 질환 | Diseases of retardation & development, childhood & adolescence | 9 |
| U50-U79 | 한의병증(韓醫病證) | Disease Pattern/Syndrome of Oriental Medicine | 191 |
| U50 | 육음병증(六淫病證) | Disease Pattern/Syndrome of Six Excesses | 9 |
| U51-U57 | 육경병증(六經病證) | Disease Pattern/Syndrome of Six Meridians | 45 |
| 태양병증(太陽病證) | Greater yang disease pattern/syndrome | 14 |
| 양명병증(陽明病證) | Yang brightness disease pattern/syndrome | 6 |
| 소양병증(少陽病證) | Lesser yang disease pattern/syndrome | 6 |
| 태음병증(太陰病證) | Greater yin disease pattern/syndrome | 3 |
| 소음병증(少陰病證) | Lesser yin disease pattern/syndrome | 10 |
| 궐음병증(厥陰病證) | Reverting yin disease pattern/syndrome | 6 |
| U58 | 위기영혈병증(衛氣營血病證) | Disease Pattern/Syndrome of Defense-Qi-Nutrient-Blood | 9 |
| U59 | 삼초병증(三焦病證) | Disease Pattern/Syndrome of Triple Energizer | 4 |
| U60-63 | (氣血陰陽津液病證) | Disease Pattern/Syndrome of Qi-Blood-Yin-Yang-Fluid-Humor | 30 |
| 기병증(氣病證) | Disease pattern/syndrome of Qi | 6 |
| 혈병증(血病證) | Disease pattern/syndrome of Blood | 6 |
| 기혈음양병증(氣血陰陽病證) | Disease pattern/syndrome of Qi-Blood-Yin-Yang | 9 |
| 진액병증(津液病證) | Disease pattern/syndrome of Fluid and Humor | 9 |
| U64-U79 | 장부병증(臟腑病證) | Disease Pattern/Syndrome of Viscera and Bowels | 94 |
| 간병증(肝病證) | Liver disease pattern/syndrome | 14 |
| 심병증(心病證) | Heart disease pattern/syndrome | 12 |
| 비병증(脾病證) | Spleen disease pattern/syndrome | 7 |
| 폐병증(肺病證) | Lung disease pattern/syndrome | 11 |
| 신병증(腎病證) | Kidney disease pattern/syndrome | 8 |
| 담병증(膽病證) | Gallbladder disease pattern/syndrome | 4 |
| 위병증(胃病證) | Stomach disease pattern/syndrome | 5 |
| 대장병증(大腸病證) | Large Intestine disease pattern/syndrome | 4 |
| 소장병증(小腸病證) | Small Intestine disease pattern/syndrome | 3 |
| 방광병증(膀胱病證) | Bladder disease pattern/syndrome | 2 |
| 충임포궁병증(衝任胞宮病證) | Disease pattern/syndrome of thoroughfare, conception vessels and uterus | 7 |
| 장부겸병증(臟腑兼病證) | Combined disease pattern/syndrome of viscera and bowels | 17 |
| U95-U98 | 사상체질병증명(四象體質病證名) | Disease Pattern/Syndrome of Four-Constitutional Medicine | 18 |
| U95 | 소음인병증(少陰人病證) | Soeumin disease pattern/syndrome | 5 |
| U96 | 소양인병증(少陽人病證) | Soyangin disease pattern/syndrome | 5 |
| U97 | 태음인병증(太陰人病證) | Taeumin disease pattern/syndrome | 5 |
| U98 | 태양인병증(太陽人病證) | Taeyangin disease pattern/syndrome | 3 |