Code R35.8, Other polyuria, was expanded to allow the addition of new code R35.81, Nocturnal polyuria. Code R35.89, Other polyuria, was also added under this new subcategory to allow the continued reporting of other and unspecified polyuria.
Nocturnal polyuria is a condition in which polyuria occurs only at night and in the absence of conditions such as neurogenic bladder, small bladder, overactive bladder or benign prostatic hyperplasia. Nocturnal polyuria is typically caused by the production of too much urine at night. With this condition, the usual day to night ratio of urine production is altered with more than one third of the patient’s total daily urine output occurring at night, although the total daily urine output remains normal. Nocturnal polyuria is more specific than nocturia or polyuria. It usually does not overlap with these conditions.
This condition may occur in patients with edema forming conditions, such as congestive heart failure; in patients with neurodegenerative conditions, such as Parkinson’s disease or Alzheimer’s disease; and in patients with diabetes mellitus and/or chronic kidney disease. However, the cause of the majority of cases of nocturnal polyuria is unknown.
AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2021 Issue 4; ICD-10-CM New/Revised Codes
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