- Uhl\’s anomaly or disease, Q24.8
- Ulcer, ulcerated, ulcerating, ulceration, ulcerative
- Ulcerosa scarlatina, A38.8
- Ulcus
- Ulegyria, Q04.8
- Ulerythema
- Ullrich syndrome (-Bonnevie)(-Turner), Q87.19
- Ullrich-Feichtiger syndrome, Q87.0
- Ulnar
- Ulorrhagia, ulorrhea, K06.8
- Umbilicus, umbilical
- Unable to
- Unacceptable
- Unaffordable transportation, Z59.82
- Unavailability (of)
- Uncinaria americana infestation, B76.1
- Uncinariasis, B76.9
- Uncongenial work, Z56.5
- Unconscious (ness)
- Under observation
- Underachievement in school, Z55.3
- Underdevelopment
- Underdosing, Z91.14
- Underfeeding, newborn, P92.3
- Underfill, endodontic, M27.53
- Underimmunization status, Z28.39
- Undernourishment
- Undernutrition
- Underweight, R63.6
- Underwood\’s disease, P83.0
- Undescended
- Undeveloped, undevelopment
- Undiagnosed (disease), R69
- Undulant fever
- Unemployment, anxiety concerning, Z56.0
- Unequal length (acquired) (limb)
- Unextracted dental root, K08.3
- Unguis incarnatus, L60.0
- Unhappiness, R45.2
- Unicornate uterus, Q51.4
- Unilateral
- Unilocular heart, Q20.8
- Unimmunized
- Union, abnormal
- Universal mesentery, Q43.3
- Unreliable transportation, Z59.82
- Unrepairable overhanging of dental restorative materials, K08.52
- Unroofed coronary sinus, Q21.13
- Unsafe transportation, Z59.82
- Unsatisfactory
- Unsoundness of mind
- Unstable
- Unsteadiness on feet, R26.81
- Untruthfulness, child problem, F91.8
- Unvaccinated
- Unverricht disease or epilepsy (-Lundborg)
- Unwanted
- Upbringing, institutional, Z62.22
- Upper respiratory
- Upset
- Urachus
- Urbach-Oppenheim disease (necrobiosis lipoidica diabeticorum)
- Urbach-Wiethe disease, E78.89
- Urbach\’s lipoid proteinosis, E78.89
- Urban yellow fever, A95.1
- Urea
- Uremia, uremic, N19
- Ureter, ureteral
- Ureteralgia, N23
- Ureterectasis
- Ureteritis, N28.89
- Ureterocele, N28.89
- Ureterolith, ureterolithiasis
- Ureterostomy
- Urethra, urethral
- Urethralgia, R39.89
- Urethritis (anterior) (posterior), N34.2
- Urethrocele, N81.0
- Urethrolithiasis (with colic or infection), N21.1
- Urethrorectal
- Urethrorrhagia, N36.8
- Urethrorrhea, R36.9
- Urethrostomy
- Urethrotrigonitis
- Urethrovaginal
- Urgency
- Urhidrosis, uridrosis, L74.8
- Uric acid in blood (increased), E79.0
- Uricacidemia (asymptomatic), E79.0
- Uricemia (asymptomatic), E79.0
- Uricosuria, R82.998
- Urinary
- Urination
- Urine
- Urinemia
- Urinoma, urethra, N36.8
- Uroarthritis, infectious (Reiter\’s)
- Urodialysis, R34
- Urolithiasis
- Uronephrosis
- Uropathy, N39.9
- Urosepsis – code to condition
- Urticaria, L50.9
- Use (of)
- Usher-Senear disease or syndrome, L10.4
- Uta, B55.1
- Uteromegaly, N85.2
- Uterovaginal
- Uterovesical
- Uveal
- Uveitis (anterior)
- Uveoencephalitis
- Uveokeratitis
- Uveoparotitis, D86.89
- Uvula
- Uvulitis (acute) (catarrhal) (chronic) (membranous) (suppurative) (ulcerative), K12.2