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URSA-CKD-R03: Registry of Hospital Inpatient Admissions

  • Published on Oct 8, 2026
  • 18 minute(s) read
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Measure Description

One record per hospital inpatient admission encounter for patients with CKD as of the encounter start date.

Metadata

  • Measure Identifier: URSA-CKD-R03
  • Measure Type: Registry
  • Temporal Structure: Event
  • Component Class: Normal-Form
  • Case Field: IP Encounter ID
  • Observation Field: IP Encounter ID
  • Target Direction: None

Published Fields

  • Data Model Keys

    • IP Encounter ID
    • IP Patient ID
    • IP Encounter Primary Payor ID
    • IP Encounter Primary Plan ID
    • IP Facility Provider ID
    • IP Attending Provider ID
    • IP Primary HCPCS Procedure Provider ID
    • IP Prior Hospital IP Encounter ID
    • Empirical Attributee Individual Nephrology Provider ID
    • Empirical Attributee Nephrology Group Provider ID
    • Empirical Attributee Primary Care Individual Provider ID
    • Empirical Attributee Primary Care Provider Group Provider ID

  • Patient Fields

    • 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

    • 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
    • IP Is Hospital IP Discharge in Prior 30 Days
    • 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)

  • Encounter Fields

    • Is Dialysis Encounter
    • Dialysis Encounter Qualifying HCPCS Code
    • IP Is Discharge Status Home or Home with Home Health
    • IP Is Routine Discharge Home
    • IP Is Discharged Home with Home Health
    • IP Inpatient LOS Category Tier 1
    • IP Is Inpatient LOS < 2 Midnights
    • IP Inpatient LOS in Elapsed Midnights
    • IP Inpatient LOS in Distinct Calendar Days
    • IP Ursa Hospital Admission Condition-Treatment Type Tier 1 Category
    • IP Is Ursa Hospital Admission Condition-Treatment Type Tier 1 Maternity
    • IP Is Ursa Hospital Admission Condition-Treatment Type Tier 1 Behavioral Health
    • IP Is Ursa Hospital Admission Condition-Treatment Type Tier 1 Surgical
    • IP Is Ursa Hospital Admission Condition-Treatment Type Tier 1 Medical
    • IP Is Emergency Department Visit Parent Encounter
    • IP Is Observation Stay Parent Encounter
    • IP Is IRF Parent Encounter
    • IP Is LTCH Parent Encounter
    • IP Is IPF Parent Encounter

  • Provider Fields

    • IP Facility Provider Description
    • IP Facility Provider CCN
    • IP Billing Provider CCN
    • IP Facility Provider Primary NUCC Provider Taxonomy Code
    • IP Facility Provider Primary NUCC Provider Taxonomy Description
    • IP Facility Provider State Abbreviation
    • IP Facility Provider ZIP Code 5-Digit
    • IP Attending Provider Description
    • IP Attending Provider Primary NUCC Provider Taxonomy Code
    • IP Attending Provider Primary NUCC Provider Taxonomy Description
    • CKD Physician Management Category
    • Count Nephrology Provider Visits in Last 12 Months
    • Empirical Attributee Individual Nephrology Provider Description
    • Empirical Attributee Nephrology Group Provider Description
    • Count Visits with Attributee Individual Primary Care Provider in Last 36 Months

  • Location Fields

    • Patient State Abbreviation
    • Patient ZIP Code 5-Digit
    • Patient County Description
    • 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)
    • CDC SVI Overall Quintile Category -- The CDC SVI Overall National Percentile grouped into 5 levels, each spanning 20 percentile points (the first quintile is percentile scores from 1 to 20 while the fifth is scores from 81 to 100). Higher scores indicate more vulnerability, so the first quintile is the least vulnerable while the fifth is the most vulnerable. 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.
    • CDC SVI Socioeconomic Quintile Category -- The CDC SVI Socioeconomic Theme National Percentile grouped into 5 levels, each spanning 20 percentile points (the first quintile is percentile scores from 1 to 20 while the fifth is scores from 81 to 100). Higher scores indicate more vulnerability, so the first quintile is the least vulnerable while the fifth is the most vulnerable. (See also [URSA-CORE] CDC SVI Socioeconomic Theme National Percentile )
    • CDC SVI Household / Disability Quintile Category -- The CDC SVI Household/Disability Theme National Percentile grouped into 5 levels, each spanning 20 percentile points (the first quintile is percentile scores from 1 to 20 while the fifth is scores from 81 to 100). Higher scores indicate more vulnerability, so the first quintile is the least vulnerable while the fifth is the most vulnerable. (See also [URSA-CORE] CDC SVI Household / Disability Theme National Percentile )
    • CDC SVI Minority / Language Quintile Category -- The CDC SVI Minority/Language Theme National Percentile grouped into 5 levels, each spanning 20 percentile points (the first quintile is percentile scores from 1 to 20 while the fifth is scores from 81 to 100). Higher scores indicate more vulnerability, so the first quintile is the least vulnerable while the fifth is the most vulnerable. (See also [URSA-CORE] CDC SVI Minority / Language Theme National Percentile)
    • CDC SVI Housing / Transportation Quintile Category -- The CDC SVI Housing/Transportation Theme National Percentile grouped into 5 levels, each spanning 20 percentile points (the first quintile is percentile scores from 1 to 20 while the fifth is scores from 81 to 100). Higher scores indicate more vulnerability, so the first quintile is the least vulnerable while the fifth is the most vulnerable. (See also [URSA-CORE] CDC SVI Housing / Transportation Theme National Percentile)

  • Insurance Fields

    • IP Encounter Primary Payor Description
    • IP Encounter Primary Plan Description
    • IP Encounter Primary Plan Financial Class Description
    • IP Is Encounter Primary Plan Financial Class Commercial
    • IP Is Encounter Primary Plan Financial Class Medicare FFS
    • IP Is Encounter Primary Plan Financial Class Medicare Advantage
    • IP Is Encounter Primary Plan Financial Class Medicaid
    • Primary Plan Description
    • Primary Plan Financial Class Description

  • Clinical Services Fields

    • IP Is Surgery Encounter
    • IP Is Prior Hospital IP Admit Surgery Encounter
    • IP Primary HCPCS Procedure HCPCS Code
    • IP Primary HCPCS Short Description
    • IP Primary HCPCS Long Description
    • IP Is 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 ICD-10-PCS AHRQ CCS Single-Level Procedure Category Code
    • IP Principal ICD-10-PCS AHRQ CCS Single-Level Procedure Category Description
    • 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.
    • Dialysis Modality Category
    • Is Dialysis Modality Hemodialysis
    • Is Dialysis Modality Peritoneal Dialysis
    • Vascular Access Type Category
    • Is Vascular Access Type Any Catheter
    • Is Vascular Access Type Graft Without Catheter
    • Is Vascular Access Type Fistula Only

  • Diagnosis Fields

    • 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
    • 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
    • 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.
    • 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.

  • Billing and Claims Fields

    • IP MS-DRG Code
    • IP MS-DRG Description
    • IP MS-DRG MDC Code
    • IP MS-DRG MDC Description
    • IP Is CMS DRG Medical-Surgical Type Surgical
    • IP Is CMS DRG Medical-Surgical Type Medical
    • IP CMS DRG Weight
    • IP APR-DRG Code
    • IP APR-DRG Description
    • IP APR-DRG MDC Code
    • IP APR-DRG MDC Description
    • IP APR-DRG Severity of Illness Code
    • IP APR-DRG Risk of Mortality Code
    • IP Is APR-DRG Medical Surgical Type Medical
    • IP Is APR-DRG Medical Surgical Type Surgical
    • IP Last CMS Type of Bill Code
    • 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

  • Financial Fields

    • IP Primary Plan Allowed Amount
    • IP Primary Plan Paid Amount
    • IP Total Plan Paid Amount from All Plans
    • IP Patient Paid Amount

  • Metadata Fields

    • IP Calculated MS-DRG Mean Length of Stay in Calendar Days
    • IP Relative Change of Encounter LOS to Calculated MS-DRG Mean
    • IP Calculated APR-DRG Mean Length of Stay in Calendar Days
    • IP Relative Change of Encounter LOS to Calculated APR-DRG Mean
    • IP CMS DRG Arithmetic Mean LOS
    • IP Relative Change of Encounter LOS to CMS MS-DRG Arithmetic Mean
    • IP CMS DRG Geometric Mean LOS
    • IP Relative Change of Encounter LOS to CMS MSDRG Geometric Mean

  • Measure Fields

    • Denominator

  • 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 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.