| U051 | UCCR | Urine Calcium/Creatinine Ratio | Detects calcium excretion in urine | UCCR used in kidney stone evaluation |
| U052 | UPJ | Ureteropelvic Junction | Junction of ureter and kidney pelvis | UPJ obstruction treated surgically |
| U053 | UDS | Urine Drug Screen | Detects presence of drugs in urine | UDS performed in ER |
| U054 | UGI | Upper Gastrointestinal | Upper part of digestive tract | UGI series done for reflux evaluation |
| U055 | U/A | Urinalysis | Laboratory examination of urine | U/A performed to detect infection |
| U056 | UT | Urinary Tract | System of kidneys, ureters, bladder | UT infection treated with antibiotics |
| U057 | UO | Urine Output | Measurement of urine volume | UO monitored in ICU patients |
| U058 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC managed with mesalamine |
| U059 | UF | Ultrafiltration | Removal of fluid in dialysis | UF performed in renal failure patients |
| U060 | UP | Uterine Prolapse | Descent of uterus into vaginal canal | UP surgically repaired in severe cases |
| U061 | UTE | Upper Tract Endoscopy | Endoscopic examination of ureters/kidneys | UTE performed to assess obstruction |
| U062 | UMN | Upper Motor Neuron | Nerve pathway in CNS | UMN lesion causes spasticity and hyperreflexia |
| U063 | USG | Ultrasonography | Imaging using sound waves | USG done for abdominal organs or fetus |
| U064 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U065 | UPE | Urine Protein Excretion | Measures protein in urine | UPE monitored in nephrotic syndrome |
| U066 | UAUC | Urinary Albumin/Creatinine | Measures albumin in urine | UAUC used for diabetic nephropathy assessment |
| U067 | UCG | Urine Culture and Gram stain | Detects bacteria in urine | UCG confirms bacterial UTI |
| U068 | URTI | Upper Respiratory Tract Infection | Infection of nose/throat | URTI treated symptomatically |
| U069 | US | Ultrasound | Imaging technique using sound waves | US performed for abdominal pain |
| U070 | U/S | Ultrasound | Synonym for US | U/S done for fetal monitoring |
| U071 | UCP | Umbilical Cord pH | Measures acid-base status in newborn | UCP measured immediately after birth |
| U072 | UTI | Urinary Tract Infection | Infection of kidneys, ureters, bladder | UTI treated with antibiotics |
| U073 | UPC | Urine Protein/Creatinine ratio | Measures protein in urine | UPC used in nephrology follow-up |
| U074 | UTN | Ureteral Tumor | Tumor in the ureter | UTN diagnosed via imaging |
| U075 | UP | Ureteropelvic | Junction of ureter and renal pelvis | UP obstruction repaired surgically |
| U076 | UTI | Urinary Tract Infection | Infection of urinary system | UTI treated with antibiotics |
| U077 | UDS | Urine Drug Screen | Detects drugs in urine | UDS performed in ER or clinic |
| U078 | UPE | Urine Protein Excretion | Measures protein lost in urine | UPE monitored in nephropathy |
| U079 | UA | Urinalysis | Lab test of urine | UA performed to detect hematuria |
| U080 | UC | Ulcerative Colitis | Chronic inflammation of colon | UC managed with mesalamine |
| U081 | UO | Urine Output | Volume of urine excreted | UO monitored in hospitalized patients |
| U082 | UF | Ultrafiltration | Fluid removal in dialysis | UF used in renal replacement therapy |
| U083 | UTE | Upper Tract Endoscopy | Endoscopy of ureters and renal pelvis | UTE done for obstruction |
| U084 | UMN | Upper Motor Neuron | CNS pathway controlling voluntary movement | UMN lesion causes spasticity |
| U085 | USG | Ultrasonography | Imaging technique | USG performed for abdominal evaluation |
| U086 | UMB | Umbilical | Pertaining to the navel | UMB hernia repaired surgically |
| U087 | UCCR | Urine Calcium/Creatinine Ratio | Measures urinary calcium excretion | UCCR used in kidney stone evaluation |
| U088 | UPJ | Ureteropelvic Junction | Junction of ureter and renal pelvis | UPJ obstruction treated surgically |
| U089 | UDS | Urine Drug Screen | Detects drugs in urine | UDS performed in ER or addiction clinic |
| U090 | UGI | Upper Gastrointestinal | Upper part of digestive tract | UGI series performed for reflux |
| U091 | U/A | Urinalysis | Laboratory urine examination | U/A detects infection, hematuria, protein |
| U092 | UT | Urinary Tract | System of kidneys, ureters, bladder | UT infection treated with antibiotics |
| U093 | UO | Urine Output | Volume of urine produced | UO monitored in ICU or post-surgery |
| U094 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC treated with medications |
| U095 | UF | Ultrafiltration | Fluid removal via dialysis | UF used in renal failure |
| U096 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U097 | UTE | Upper Tract Endoscopy | Endoscopic examination | UTE performed for ureteral obstruction |
| U098 | UMN | Upper Motor Neuron | CNS nerve pathway | UMN lesion causes spasticity |
| U099 | USG | Ultrasonography | Imaging using sound waves | USG performed for kidney evaluation |
| U100 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U101 | UAUC | Urinary Albumin/Creatinine | Measures albumin in urine | UAUC monitored in diabetes |
| U102 | UCG | Urine Culture and Gram stain | Detects urinary pathogens | UCG confirms UTI |
| U103 | URTI | Upper Respiratory Tract Infection | Infection of nose/throat | URTI treated symptomatically |
| U104 | US | Ultrasound | Imaging technique | US performed for abdominal pain |
| U105 | U/S | Ultrasound | Synonym for US | U/S performed for fetal assessment |
| U106 | UCP | Umbilical Cord pH | Newborn acid-base status | UCP measured immediately after birth |
| U107 | UTI | Urinary Tract Infection | Infection of urinary system | UTI treated with antibiotics |
| U108 | UPC | Urine Protein/Creatinine ratio | Measures urine protein | UPC used in nephrology follow-up |
| U109 | UTN | Ureteral Tumor | Tumor of ureter | UTN diagnosed via imaging |
| U110 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction surgically corrected |
| U111 | UPE | Urine Protein Excretion | Protein loss in urine | UPE monitored in nephrotic syndrome |
| U112 | UA | Urinalysis | Lab urine test | UA detects hematuria or infection |
| U113 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC treated with medications |
| U114 | UO | Urine Output | Volume of urine | UO monitored in hospitalized patients |
| U115 | UF | Ultrafiltration | Fluid removal via dialysis | UF used in renal replacement therapy |
| U116 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U117 | UTE | Upper Tract Endoscopy | Endoscopic examination of ureters/kidneys | UTE performed for obstruction |
| U118 | UMN | Upper Motor Neuron | CNS nerve pathway | UMN lesion causes spasticity |
| U119 | USG | Ultrasonography | Imaging technique | USG performed for kidney evaluation |
| U120 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U121 | UCCR | Urine Calcium/Creatinine Ratio | Detects calcium excretion | UCCR used in kidney stone evaluation |
| U122 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction treated surgically |
| U123 | UDS | Urine Drug Screen | Detects drugs in urine | UDS performed in ER or clinic |
| U124 | UGI | Upper Gastrointestinal | Upper digestive tract | UGI series performed for reflux |
| U125 | U/A | Urinalysis | Lab test of urine | U/A detects infection, protein, hematuria |
| U126 | UT | Urinary Tract | Kidneys, ureters, bladder | UT infection treated with antibiotics |
| U127 | UO | Urine Output | Volume of urine produced | UO monitored in ICU |
| U128 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC managed with mesalamine |
| U129 | UF | Ultrafiltration | Removal of fluid | UF used in dialysis |
| U130 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U131 | UTE | Upper Tract Endoscopy | Endoscopic examination of urinary tract | UTE performed for obstruction |
| U132 | UMN | Upper Motor Neuron | CNS pathway | UMN lesion causes spasticity |
| U133 | USG | Ultrasonography | Imaging using sound waves | USG performed for abdominal organs |
| U134 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U135 | UAUC | Urinary Albumin/Creatinine | Albumin measurement in urine | UAUC monitored in diabetes |
| U136 | UCG | Urine Culture and Gram stain | Detects bacteria in urine | UCG confirms UTI |
| U137 | URTI | Upper Respiratory Tract Infection | Infection of nose/throat | URTI treated symptomatically |
| U138 | US | Ultrasound | Imaging technique | US performed for abdominal pain |
| U139 | U/S | Ultrasound | Synonym for US | U/S performed for fetal assessment |
| U140 | UCP | Umbilical Cord pH | Acid-base status of newborn | UCP measured after delivery |
| U141 | UTI | Urinary Tract Infection | Infection of urinary system | UTI treated with antibiotics |
| U142 | UPC | Urine Protein/Creatinine ratio | Measures urine protein | UPC used in nephrology follow-up |
| U143 | UTN | Ureteral Tumor | Tumor in ureter | UTN diagnosed via imaging |
| U144 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction corrected surgically |
| U145 | UPE | Urine Protein Excretion | Protein loss in urine | UPE monitored in nephrotic syndrome |
| U146 | UA | Urinalysis | Lab test of urine | UA performed to detect infection |
| U147 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC managed with medications |
| U148 | UO | Urine Output | Volume of urine | UO monitored in ICU patients |
| U149 | UF | Ultrafiltration | Removal of fluid via dialysis | UF performed in renal failure |
| U150 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U151 | UTE | Upper Tract Endoscopy | Endoscopic evaluation of ureters/kidneys | UTE performed for obstruction |
| U152 | UMN | Upper Motor Neuron | CNS nerve pathway | UMN lesion causes spasticity |
| U153 | USG | Ultrasonography | Imaging technique using sound waves | USG performed for abdominal evaluation |
| U154 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U155 | UCCR | Urine Calcium/Creatinine Ratio | Detects urinary calcium excretion | UCCR used in kidney stone evaluation |
| U156 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction treated surgically |
| U157 | UDS | Urine Drug Screen | Detects drugs in urine | UDS performed in ER |
| U158 | UGI | Upper Gastrointestinal | Upper digestive tract | UGI series performed for reflux |
| U159 | U/A | Urinalysis | Lab test of urine | U/A detects infection and protein |
| U160 | UT | Urinary Tract | System of kidneys, ureters, bladder | UT infection treated with antibiotics |
| U161 | UO | Urine Output | Volume of urine | UO monitored in ICU or post-surgery |
| U162 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC treated with medications |
| U163 | UF | Ultrafiltration | Removal of fluid | UF used in dialysis |
| U164 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U165 | UTE | Upper Tract Endoscopy | Endoscopic evaluation | UTE performed for obstruction |
| U166 | UMN | Upper Motor Neuron | CNS pathway | UMN lesion causes spasticity |
| U167 | USG | Ultrasonography | Imaging using sound waves | USG performed for abdominal organs |
| U168 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U169 | UAUC | Urinary Albumin/Creatinine | Measures albumin in urine | UAUC monitored in diabetes |
| U170 | UCG | Urine Culture and Gram stain | Detects bacteria in urine | UCG confirms UTI |
| U171 | URTI | Upper Respiratory Tract Infection | Infection of nose/throat | URTI treated symptomatically |
| U172 | US | Ultrasound | Imaging technique | US performed for abdominal pain |
| U173 | U/S | Ultrasound | Synonym for US | U/S performed for fetal assessment |
| U174 | UCP | Umbilical Cord pH | Acid-base status of newborn | UCP measured immediately after birth |
| U175 | UTI | Urinary Tract Infection | Infection of urinary system | UTI treated with antibiotics |
| U176 | UPC | Urine Protein/Creatinine ratio | Measures protein in urine | UPC used in nephrology follow-up |
| U177 | UTN | Ureteral Tumor | Tumor in ureter | UTN diagnosed via imaging |
| U178 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction surgically corrected |
| U179 | UPE | Urine Protein Excretion | Protein loss in urine | UPE monitored in nephrotic syndrome |
| U180 | UA | Urinalysis | Lab test of urine | UA performed to detect infection |
| U181 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC managed with medications |
| U182 | UO | Urine Output | Volume of urine | UO monitored in ICU patients |
| U183 | UF | Ultrafiltration | Removal of fluid via dialysis | UF performed in renal failure |
| U184 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U185 | UTE | Upper Tract Endoscopy | Endoscopic evaluation | UTE performed for obstruction |
| U186 | UMN | Upper Motor Neuron | CNS pathway | UMN lesion causes spasticity |
| U187 | USG | Ultrasonography | Imaging technique using sound waves | USG performed for abdominal evaluation |
| U188 | UMB | Umbilical | Pertaining to navel | UMB hernia repaired surgically |
| U189 | UCCR | Urine Calcium/Creatinine Ratio | Detects urinary calcium excretion | UCCR used in kidney stone evaluation |
| U190 | UPJ | Ureteropelvic Junction | Ureter-kidney pelvis junction | UPJ obstruction treated surgically |
| U191 | UDS | Urine Drug Screen | Detects drugs in urine | UDS performed in ER |
| U192 | UGI | Upper Gastrointestinal | Upper digestive tract | UGI series performed for reflux |
| U193 | U/A | Urinalysis | Lab test of urine | U/A detects infection and protein |
| U194 | UT | Urinary Tract | System of kidneys, ureters, bladder | UT infection treated with antibiotics |
| U195 | UO | Urine Output | Volume of urine | UO monitored in ICU or post-surgery |
| U196 | UC | Ulcerative Colitis | Chronic inflammatory bowel disease | UC treated with medications |
| U197 | UF | Ultrafiltration | Removal of fluid | UF used in dialysis |
| U198 | UP | Uterine Prolapse | Descent of uterus | UP surgically corrected |
| U199 | UTE | Upper Tract Endoscopy | Endoscopic evaluation | UTE performed for obstruction |
| U200 | UMN | Upper Motor Neuron | CNS pathway | UMN lesion causes spasticity |