Table 3.

ICD-9 codes used to identify and the criteria used to validate kidney disease and selected comorbid conditions included in the registry

Comorbid ConditionICD-9 Codes for Relevant ConditionsChart Review Validation Criteria
CKD585, 585.1, 585.2, 585.3, 585.4, 585.5, 585.6, 585.9
  1. Estimated GFR

  2. Nephrology notes

Diabetic nephropathy250.4, 250.40, 250.41, 250.42, 250.43
  1. History of diabetes mellitus

  2. Micro or macroalbuminuria

  3. Nephrology notes

Glomerulonephritis580, 580.0, 580.4, 580.8, 580.81, 580.89, 580.9, 582, 582.1, 582.2, 582.4, 582.8, 582.81, 582.89, 582.9
  1. Renal biopsy reports

  2. Proteinuria

  3. Nephrology notes

Polycystic kidney disease753.12, 753.13, 753.14
  1. Renal ultrasound or computed tomography or CT to look for cysts

  2. Nephrology notes

Coronary artery disease410, 410.0, 410.00, 410.01, 410.02, 410.1, 410.10, 410.11, 410.12, 410.2, 410.20, 410.21, 410.22, 410.3, 410.30, 410.31, 410.32, 410.4, 410.40, 410.41, 410.42, 410.5, 410.50, 410.51, 410.52, 410.6, 410.60, 410.61, 410.62, 410.7, 410.71, 401.72, 410.8, 410.81, 410.82, 410.9, 410.90, 410.91, 410.92, 411, 411.0, 411.1, 411.8, 411.81, 411.89, 412, 413, 413.0, 413.1, 413.9, 414, 414.0, 414.00, 414.01, 414.02, 414.03, 414.04, 414.05, 414.06, 414.07, 414.1, 414.10, 414.11, 414.12, 414.19, 414.2, 414.3, 414.8, 414.9
  1. Cardiac catheterization results or procedure notes

  2. Cardiology notes

Congestive heart failure428.0
  1. Echocardiogram

  2. Cardiology notes

  3. Cardiac stress test results

  4. Relevant medications

Cerebrovascular disease430.0, 431, 432.0, 432.1, 433.00, 433.01, 433.1, 433.10, 433.11, 433.2, 433.20, 433.21, 433.3, 433.30, 433.31, 433.8, 433.80, 433.81, 433.9, 433.91, 434.0, 434.00, 434.01, 434.1, 434.10, 434.11, 434.9, 434.90, 434.91, 435.0, 435.1, 435.2, 435.3, 435.8, 435.9, 436, 437.0, 437.1, 437.3, 437.4, 437.5, 437.6, 437.8, 437.9, 438, 438.0, 438.10, 438.11, 438.12, 438.19, 438.20, 438.21, 438.22, 438.30, 438.31, 438.32, 438.40, 438.41, 438.42, 438.50, 438.51, 438.52, 438.53, 438.6, 438.7, 438.81, 438.81, 438.82, 438.83, 438.84, 438.85, 438.89, 438.9
  1. Computed tomography/magnetic resonance imaging/MRA/carotid doppler results

  2. Neurology/cardiology notes

Diabetes250, 250.0, 250.00, 250.01, 250.02, 250.03, 250.1, 250.10, 250.11, 250.12, 250.13, 250.2, 250.20, 250.21, 250.22, 250.23, 250.3, 250.30, 250.31, 250.32, 250.33, 250.4, 250.40, 250.41, 250.42, 250.43, 250.5, 250.50, 250.51, 250.52, 250.53, 250.6, 250.60, 250.61, 250.62, 250.63, 250.7,250.70, 250.71, 250.72,250.73, 250.8, 250.81, 250.81,250.82, 250.83, 250.9, 250.90, 250.91, 250.92, 250.93
  1. Use of oral hypoglycemics or insulin

  2. Relevant laboratory tests (HgbA1C, fasting blood sugar)

Hyperlipidemia272.0, 272.1, 272.2, 272.3, 272.4
  1. Use of ICD-9 codes at two different visits and/or

  2. Use of statins or fibrates and/or

  3. Total cholesterol >200 mg/dl or LDL cholesterol >130 mg/dl)

Hypertension401, 401.0, 401.1, 401.9, 402, 402.0, 402.00, 402.01, 402.1, 402.10, 402.11, 402.9, 402.90, 402.91, 403, 403.00, 403.01, 403.1, 403.10, 403.11, 403.9, 403.91, 404, 404.0, 404.00, 404.01, 404.02, 404.03, 404.1, 404.10, 404.11, 404.12, 404.13, 404.9, 404.90, 404.91, 404.92, 404.93, 405, 405.0, 405.01, 405.09, 405.1, 405.11, 405.19, 405.9, 405.91, 405.99
  1. Use of two or more use of relevant ICD-9 codes during outpatient visits and/or

  2. BP >130/80 in two different visits and/or

  3. One outpatient use of ICD-9 code and use of at least one antihypertensive medication