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Indicator Details: Age of Patients
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Non-Hispanic whites are the largest racial/ethnic group in ages 70+, followed by Native Hawaiian/Pacific Islander. There is a greater fraction of Asian and Hispanic veterans in aged 70 years or older (23.4% for Asians and 25.9% for Hispanics) relative to the fraction of veterans ages 20-29 (5.4% for Asians; 5.7% for Hispanics). The percentage of veterans without race/ethnic information has increased greatly over time and in 2017, is lowest in the 20-29 age range (3.3%) and highest in 70+ group (38.9%).
Chart Explanation: The chart shows on the y-axis (vertical line) the percentage of patients, and the x-axis (horizontal line) shows the age groups by year, gender, or race.
The Veteran’s Affairs (VA) data presented are from a national sample of health care visits to the VA Health System by eligible U. S. veterans. During any given year, ~70% of the outpatient population receives a serum creatinine test. While the demographics of VA Health System users are distinct from the general U.S. population, the VA data allow a ‘snapshot’ of clinical practices across the nation.

National VA data were examined for veterans with at least one outpatient visit during the federal fiscal year. To estimate prevalence of CKD, outpatient serum creatinine laboratory results (averaged if a patient had more than one test during the fiscal year) were used to calculate an estimated glomerular filtration rate (eGFR) for each patient using the CKD-EPI equation, excluding dialysis and transplant patients. Estimated GFR (kidney function) was classified into five CKD categories (eGFR =90, eGFR 60-89, stage 3=eGFR 30-59, stage 4=eGFR 15 to 29, and stage 5 without dialysis=eGFR<15 ml/min/1.73 m² and “eGFR Unmeasured” for those patients without serum creatinine testing. Inpatient serum creatinine data were not used as they would be affected by the presence of acute illnesses. Due to the infrequency of testing, albuminuria was not included in the definition of CKD. Dialysis patients were defined by clinic stop-codes (602-611), outpatient procedure codes for dialysis (CPT4: 90921 and 90925), outpatient diagnosis codes (ICD-9-CM: 585.6, V56, V45.1 and E87.91 and ICD-10-CM: N186, Y841, Z4931, Z4901, Z4902, Z4931, Z4932, and Z4933)  to indicate dialysis. Kidney transplant patients were identified by inpatient and outpatient ICD-9-CM diagnosis code V420, 99681, ICD-10 CM diagnosis code T86X, Z4822 and Z940, and inpatient procedure and surgery codes (55.69)

This material is the result of work supported with resources and the use of facilities at the Veterans Affairs Ann Arbor Health Care System, Ann Arbor, Michigan.
Secondary (1) Indicator Method of MeasurementOutpatient and/or inpatient visits
Primary Indicator Method of MeasurementOutpatient visit
Secondary (1) VariableRace/Ethnicity
Description of MeasureRacial/ethnic distribution within age group
U.S. Region Covered by Primary VariableAll
Period Currently Available2005–2018
Data SourceVA
Type of Data SourceAdministrative
Data SetVA National Data, using the MedSAS data files
DenominatorTotal number of patients (age>20) in denominator in specified race/ethnic group
NumeratorPatients in denominator in each age group
Health Care System DataYes
Regional or National?National
Demographic GroupPatients in VA health plan
Primary Data Source IndicatorAge = (Date of Visit - Date of Birth)/365.25

Suggested Citation:
Centers for Disease Control and Prevention. Chronic Kidney Disease Surveillance System—United States.
website. http://www.cdc.gov/ckd