ICD-10-CM categoryN18 (Chronic kidney disease)is used to reportCKD by stage, including stage-based descriptors andend stage renal disease (ESRD). Within N18, codes identify CKD stage 1 through stage 5,ESRD (stage 5D), and CKD unspecified. Outpatient CDI review focuses on ensuring providers document thestage(often supported by eGFR trends) because stage drives correct code selection and accurately reflects disease severity for risk, quality, and medical necessity. Options that includedialysisare not part of N18 itself; dialysis status and encounter codes are reported elsewhere (e.g., dialysis dependence/status codes), not as N18 category diagnoses.AKI(acute kidney injury) andATN(acute tubular necrosis) are acute renal conditions and are coded outside N18. Likewise, polycystic kidney disease and “uremia” are separate diagnoses with their own code categories. Therefore, the set that correctly matches what N18 represents is CKD stage-based diagnoses such asCKD stage 3, more advanced/severe CKD stages, andESRD.
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