--- title: "URSA-CKD-004: Hospital Admissions per 1000 CKD Patient-Years" slug: "ursa-ckd-004-hospital-admissions-per-1000-ckd-patient-years" updated: 2026-10-08T03:13:08Z published: 2026-10-08T03:13:08Z canonical: "docs.ursahealth.com/ursa-ckd-004-hospital-admissions-per-1000-ckd-patient-years" --- > ## Documentation Index > Fetch the complete documentation index at: https://docs.ursahealth.com/llms.txt > Use this file to discover all available pages before exploring further. # URSA-CKD-004: Hospital Admissions per 1000 CKD Patient-Years ## Measure Description Among patients with CKD, the population rate of hospital inpatient admissions per 1000 patient-years ## Metadata - **Measure Identifier**: URSA-CKD-004 - **Measure Type**: Rate Measure - **Temporal Structure**: Interval - **Component Class**: Long-Form - **Denominator Case Field**: Patient ID - **Denominator Observation Fields**: Patient ID, Segmented Period Start Date [, segmented_period_start_date] - **Target Direction**: Down ## Denominator Description The elapsed time in a reporting period during which the patient had (1) CKD Stage; and (2) claims data available, expressed in units of 1000s of patient-years. ## Numerator Description The count of hospital inpatient admission encounters with encounter start date falling within a qualifying denominator period ## Published Fields - **Data Model Keys** - Patient ID -- The internal database identifier (used, e.g., for joins and primary keys) for the patient. This value is typically mastered, i.e., all records for the same patient, regardless of the source data system from which that record originated, should have the same Patient ID value. (Note that while the mastered Patient ID value might resemble a local identifier used in one of the upstream data sources, this does not indicate any special priority of that source system in determining the characteristics of the patient.) (See also [URSA-CORE] Patient) - Primary Plan ID -- The identifier for the health insurance plan product that is the first party responsible for payment. - Primary Payor ID -- The internal database identifier (used, e.g., for joins and primary keys) for the Primary Payor. (See also [URSA-CORE] Primary Payor) - Empirical Attributee Individual Nephrology Provider ID - Empirical Attributee Nephrology Group Provider ID - **Patient Fields** - Patient Date of Birth -- The patient's date of birth. On the Patients Natural Object, this field reflects the "best" known value for the patient available from all data sources; on other Natural Objects, e.g., MMR Member-Months, the value faithfully reflects the date of birth found on that particular type of record in the source data. - Is Patient Alive - Patient Age Integer -- Patient age, expressed as an integer, as of a reference date or interval. - Patient Age Category Tier 1 -- Non-overlapping ranges of the patient age in years into three categories; [01] Pediatrics < 19, [02] Adults 19 - 64, and [03] Older Adults >= 65. Coarser grain to the Patient Age Category Tier 2. (See also [URSA-CORE] Patient Age Category Tier 2) - Patient Age Category Tier 2 -- Non-overlapping ranges of the patient age in years representing finer grain categories than the Patient Age Category Tier 1. This field incorporates findings from publications on defining meaningful age groups in the context of disease. These ranges closely, but not exactly, align with standard age ranges such as those defined by the Medical Subject Headings (MeSH). See results of K-Means simple clustering method at: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3825015/ (See also [URSA-CORE] Patient Age Category Tier 1) - Patient Sex Category - Count Hospital Inpatient Admissions in Last 12 Months - Count ED Visits Without Inpatient Admissions in Last 12 Months - **Date Fields** - Current Continuous Primary Payor Membership Episode Start Date -- The start date of the Continuous Primary Payor Membership Episode in effect as of the (potentially historical) period covered by the record. (See also [URSA-CORE] Continuous Primary Payor Membership Episode) - Current Continuous Primary Payor Membership Episode End Date -- The end date of the Continuous Primary Payor Membership Episode in effect as of the (potentially historical) period covered by the record. Values follow the standard exclusive convention for Period End Dates. (See also [URSA-CORE] Continuous Primary Payor Membership Episode, [URSA-CORE] Period End Date) - Current Dialysis Episode Start Date - Current Dialysis Episode End Date - Segment Start Date -- The start date of the reporting segment. (See also [URSA-CORE] Reporting Segment) - Segment End Date -- The end date of the reporting segment. (See also [URSA-CORE] Reporting Segment) - Segmented Period Start Date - Segmented Period End Date - **Provider Fields** - CKD Physician Management Category - Plan Attributee Provider Description - Count Nephrology Provider Visits in Last 12 Months - Empirical Attributee Individual Nephrology Provider Description - Empirical Attributee Nephrology Group Provider Description - Count Primary Care Visits for CKD in Last 12 Months - Primary Care Engagement Category - Count Primary Care Visits in Last 36 Months - Empirical Attributee Primary Care Provider Group Description - Empirical Attributee Individual Primary Care Provider Description - Count Visits with Attributee Individual Primary Care Provider in Last 36 Months - Count Visits with Attributee Primary Care Provider Group in Last 36 Months - **Location Fields** - Patient ZIP Code 5-Digit - UW HIP ADI Quintile Category -- The UW HIP Area Deprivation Index National Percentile grouped into 5 levels, each spanning 20 percentile points (ADI 1 is percentile scores from 1 to 20 while ADI 5 is scores from 81 to 100). Higher scores indicate more deprivation, so ADI 1 is the least deprived while ADI 5 is the most deprived. Quintiles are frequently used in health research. They give larger sample sizes per group and are easier to plot and interpret. Quintiles also carry less information and group more dissimilar patients. Quintiles are good for descriptive analyses while the original percentile measure is preferable for predictive modeling. (See also [URSA-CORE] UW HIP Area Deprivation Index National Percentile) - **Insurance Fields** - Is Any Current Plan Membership - Primary Plan Description - Primary Plan Financial Class Description - **Clinical Services Fields** - Is Hospice in Last 12 Months -- Evidence of CMS hospice status or evidence of hospice services in the last 12 months. Typically used as a denominator exclusion. - Is Last Dialysis Modality Hemodialysis - Is Last Dialysis Modality Peritoneal Dialysis - **Diagnosis Fields** - Count CCW Conditions -- The total of both Chronic Conditions and Potentially Disabling Events included in the CMS Chronic Condition Warehouse (CCW) library. (See also [URSA-CORE] CCW Comorbidity Category, [URSA-CORE] Count Potentially Disabling Events, [URSA-CORE] CMS Chronic Condition Warehouse (CCW), [URSA-CORE] Count Chronic Conditions) - Is CCW System Behavioral Health -- Indicates the patient has one or more of the following CCW conditions; ADHD, Conduct Disorders, and Hyperkinetic Syndrome, Anxiety Disorders, Autism Spectrum Disorder, Bipolar Disorder, Depression, Depressive Disorders, Personality Disorders, PTSD, Schizophrenia, or Schizophrenia and Other Psychotic Disorders. - Is CCW System Cardiovascular -- Indicates the patient has one or more of the following CCW conditions; Acute Myocardial Infarction (AMI), Atrial Fibrillation, Heart Failure, Hypertension, Ischemic Heart Disease, or Peripheral Vascular Disease (PVD). - Is CCW System Genitourinary -- Indicates the patient has one or more of the following CCW conditions; Benign Prostatic Hyperplasia or Chronic Kidney Disease (CKD). - Is CCW System Musculoskeletal -- Indicates the patient has one or more of the following CCW conditions; Hip or Pelvic Fracture, Rheumatoid Arthritis or Osteoarthritis, or Osteoporosis. - Is CCW System Pulmonary -- Indicates the patient has one or more of the following CCW conditions; Asthma, or Chronic Obstructive Pulmonary Disease (COPD) and Bronchiectasis. - Is CCW Acquired Hypothyroidism -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Acute Myocardial Infarction -- At least 1 inpatient claim with one or more of the DX codes from the corresponding CCW value set as the first or second diagnosis position in the prior 1 year. - Is CCW Alzheimers Disease -- At least 1 inpatient, SNF, HHA, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 3 years. - Is CCW Anemia -- At least 1 inpatient, SNF, HHA, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Anxiety Disorders -- At least 1 inpatient OR 2 other nondrug claims of any service type with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Asthma -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Atrial Fibrillation -- At least 1 inpatient OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set as the first or second diagnosis position in the prior 1 year. - Is CCW Benign Prostatic Hyperplasia -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. Exclusion: If any of the qualifying claims also have an ICD-10 DX of D29.1, then it is excluded. - Is CCW Bipolar Disorder -- At least 1 inpatient OR 2 other nondrug claims of any service type with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Breast Cancer -- At least 1 inpatient, SNF OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in prior 1 year. - Is CCW Cataract -- At least 1 HOP or Carrier claim with one or more of the DX codes from the corresponding CCW value set as the principal diagnosis position in the prior 1 year. - Is CCW CKD -- Indicates that the patient meets the CMS Chronic Condition Warehouse criteria for chronic kidney disease; i.e., 2 or more qualifying outpatient or professional ICD codes in the prior 2 years, or 1 or more non-outpatient institutional claim ICD codes in the prior 2 years. - Is CCW COPD and Bronchiectasis -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Colorectal Cancer -- At least 1 inpatient, SNF OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Depression -- At least 1 inpatient, SNF, HHA, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Depressive Disorders -- At least 1 inpatient OR 2 other nondrug claims of any service type with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Diabetes -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Endometrial Cancer -- At least 1 inpatient, SNF OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Glaucoma -- At least 1 Carrier claim with one or more of the DX codes from the corresponding CCW value set as the principal diagnosis position in the prior 1 year. - Is CCW Heart Failure -- At least 1 inpatient, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Ischemic Heart Disease -- At least 1 inpatient, SNF, HHA, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Hip or Pelvic Fracture -- At least 1 inpatient or SNF claim with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Hyperlipidemia -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Hypertension -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Lung Cancer -- At least 1 inpatient, SNF OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Osteoporosis -- At least 1 inpatient, SNF, HHA OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Prostate Cancer -- At least 1 inpatient, SNF OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. - Is CCW Rheumatoid Arthritis or Osteoarthritis -- At least 2 inpatient, SNF, HHA, HOP, or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 2 years. - Is CCW Stroke or Transient Ischemic Attack -- At least 1 inpatient OR 2 HOP or Carrier claims with one or more of the DX codes from the corresponding CCW value set in the prior 1 year. EXCLUSIONS: If any of the qualifying claims have : 800 <= DX Code <= 804.9, 850 <= DX Code <= 854.1 in any DX position OR DX V57xx as the principal DX Code, then the claim is excluded. - Is CCW Schizophrenia or Other Psychotic Disorders -- At least 1 inpatient OR 2 other nondrug claims of any service type with one ore more of the DX codes from the corresponding CCW value set in the prior 2 years. - CCW Count Category - CCW Systems Category - Count CCW Systems -- The count of distinct systems of the body with one or more active CCW Condition. CCW Systems are as a parent category to the individual CCW Conditions grouping them based primarily on the human body system they impact such as; Behavioral Health, Cancers, Cardiovascular, Cerebrovascular, Endocrine, Genitourinary, Musculoskeletal, and Pulmonary. (See also [URSA-CORE] CMS Chronic Condition Warehouse (CCW)) - Is CCW System Congenital -- Indicates the patient has one or more of the following CCW conditions; Cerebral Palsy, Cystic Fibrosis and Other Metabolic Disorder, Intellectual Disability, Learning Disability, Muscular Dystrophy, or Other Developmental Delays. - Is CCW System Endocrine/Metabolic -- Indicates the patient has one or more of the following CCW conditions; Diabetes, Acquired Hypothyroidism, Hyperlipidemia, or Obesity. - Is CCW System Hematologic -- Indicates the patient has one or more of the following CCW conditions; Anemia. - Is CCW System Neurological -- Indicates the patient has one or more of the following CCW conditions; Alzheimer's Disease, Alzheimer's Disease and Related Disorders or Senile Dementia, Stroke or Transient Ischemic Attack, Epilepsy, Migraine and Chronic Headache, Mobility Impairment, Multiple Sclerosis, or Deafness and Hearing Impairment. - Is CCW System Oncologic -- Indicates the patient has one or more of the following CCW conditions; Breast Cancer, Colorectal Cancer, Endometrial Cancer, Lung Cancer, Prostate Cancer, or Leukemia. - Is CCW System Ophthalmologic -- Indicates the patient has one or more of the following CCW conditions; Cataract, Glaucoma, or Blindness and Visual Impairment. - Is CCW System Other -- Indicates the patient has one or more of the following CCW conditions; Fibromyalgia and Chronic Pain and Fatigue, Pressure or Chronic Ulcer. - Is CCW Alzheimers Disease and Related Disorders or Senile Dementia -- At least 1 inpatient, SNF, HHA, HOP, or Carrier claim with one or more of the DX codes from the corresponding CCW value set in the prior 3 years. - **Numerator Fields** - IP Encounter ID - IP Facility Provider ID - IP Prior Hospital IP Encounter ID - IP Encounter Start Date - IP Encounter Patient Inpatient Status Start Date - IP Encounter End Date - IP Encounter Start Date Day of Week - IP Inpatient Status Start Date Day of Week - IP Encounter End Date Day of Week - IP Prior Hospital IP Encounter End Date - IP Elapsed Days from Prior Hospital IP Encounter End Date - Is IP Hospital IP Discharge in Prior 30 Days - IP Ursa Hospital Admission Condition-Treatment Type Tier 1 Category - IP Inpatient LOS Category Tier 1 - Is IP Inpatient LOS < 2 Midnights - IP Inpatient LOS in Elapsed Midnights - IP Inpatient LOS in Distinct Calendar Days - Is IP Emergency Department Visit Parent Encounter - Is IP Observation Stay Parent Encounter - Is IP Discharge Status Home or Home with Home Health - Is IP Routine Discharge Home - Is IP Discharged Home with Home Health - Is IP Surgery Encounter - Is IP Prior Hospital IP Admit Surgery Encounter - IP Primary HCPCS Procedure HCPCS Code - IP Primary HCPCS Short Description - Is IP Primary HCPCS Procedure Surgical - IP Primary HCPCS AHRQ CCS Single-Level Procedure Category Code - IP Primary HCPCS AHRQ CCS Single-Level Procedure Category Description - IP Principal ICD Procedure ICD-10-PCS Code - IP Principal ICD Procedure ICD-10-PCS Description - IP Principal ICD-10-PCS AHRQ CCS Multi-Level Procedure Category Tier 1 Code - IP Principal ICD-10-PCS AHRQ CCS Multi-Level Procedure Category Tier 1 Description - IP Principal Discharge Diagnosis ICD-10-CM Code - IP Principal Discharge Diagnosis ICD-10-CM Description - IP Prior Admit Principal Discharge Diagnosis ICD-10-CM Code - IP Prior Admit Principal Discharge Diagnosis ICD-10-CM Description - IP Discharge Diagnosis AHRQ CCS Single-Level Diagnosis Category Code - IP Discharge Diagnosis AHRQ CCS Single-Level Diagnosis Category Description - IP Discharge Diagnosis AHRQ CCS Multi-Level Diagnosis Category Tier 1 Code - IP Discharge Diagnosis AHRQ CCS Multi-Level Diagnosis Category Tier 1 Description - IP Discharge Diagnosis AHRQ CCS Multi-Level Diagnosis Category Tier 2 Code - IP Discharge Diagnosis AHRQ CCS Multi-Level Diagnosis Category Tier 2 Description - IP Discharge Diagnosis WHO ICD-10 Chapter Description - IP Discharge Diagnosis WHO ICD-10 Block Description - IP Facility Provider Description - IP Facility Provider State Abbreviation - IP Facility Provider ZIP Code 5-Digit - IP MS-DRG Code - IP MS-DRG Description - IP MS-DRG MDC Code - IP MS-DRG MDC Description - Is IP CMS DRG Medical-Surgical Type Surgical - IP APR-DRG Code - IP APR-DRG Description - IP APR-DRG MDC Code - IP APR-DRG MDC Description - Is IP APR-DRG Medical Surgical Type Medical - Is IP APR-DRG Medical Surgical Type Surgical - IP CMS Admit Type Code - IP CMS Admit Type Description - IP CMS Admit Source Code - IP CMS Admit Source Description - IP CMS Patient Discharge Status Code - IP CMS Patient Discharge Status Description - IP Primary Plan Allowed Amount - IP Primary Plan Paid Amount - IP Total Plan Paid Amount from All Plans - IP Patient Paid Amount - **Measure Fields** - Denominator - Numerator - **Module Fields** - CKD Stage Category -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is CKD Stage 1 -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is CKD Stage 2 -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is CKD Stage 3a - Is CKD Stage 3b - Is CKD Stage 4 -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is CKD Stage 5 -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is ESRD -- The stage of a patient’s chronic kidney disease (CKD), for stage 1 through stage 5 and ESRD. Stage is only calculated for patients already meeting the criteria for CKD. Stage is determined by a combination of the following: (1) ICD-10-CM codes specific to a particular stage; (2) eGFR lab results within certain bands associated with a stage (see below); (3) identification of the patient in a CMS Monthly Membership Report as an ESRD beneficiary; (4) documentation of a prior kidney transplantation surgery; and/or (5) status as a chronic dialysis patient. The patient’s CKD stage can change over time, so a patient timeline data structure is appropriate. The following eGFR bands are used: GFR >= 90: Stage 1; 60 <= GFR < 90: Stage 2; 30 <= GFR < 60: Stage 3; 15 <= GFR < 30: Stage 4; GFR < 15: Stage 5. The appropriate race-specific eGFR lab is used when the patient's race is known. (See also [URSA-CKD] Is Chronic Dialysis Patient, [URSA-CKD] Kidney Transplantation Surgery Encounter) - Is CKD Stage Unknown - Is CKD Stage 3 or Higher - Is CKD Stage 4 or Higher - Is Chronic Dialysis Patient -- Indicates that the patient has either (1) documentation in the last 12 months of a chronic dialysis status code; or (2) is currently undergoing regular episode as part of an episode that contains at least one non-inpatient dialysis encounter. - Is History of Kidney Transplantation - **[No Field Group]**