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2025 ICD-10-CM code R35.81

Nocturnal polyuria.

Code R35.81 should be used when the primary symptom is excessive urination at night. If the underlying cause is known, it should be coded as well.

Medical necessity for services related to nocturnal polyuria should be supported by documentation of the symptoms, impact on the patient's quality of life, and the clinical rationale for the chosen treatment approach.

Clinicians are responsible for evaluating patients presenting with nocturnal polyuria to determine the underlying cause and appropriate treatment. This involves taking a thorough medical history, conducting a physical exam, and ordering relevant diagnostic tests, such as urinalysis, blood tests, and imaging studies. Based on the findings, clinicians may initiate treatment or refer the patient to a specialist, such as a urologist or nephrologist.

In simple words: Nocturnal polyuria is a condition characterized by excessive urination at night.

Excessive urination during the night.

Example 1: A 65-year-old male with benign prostatic hyperplasia experiences increased urinary frequency at night, impacting his sleep quality. He is diagnosed with nocturnal polyuria and treated with medication to shrink the prostate., A 30-year-old female with uncontrolled diabetes mellitus presents with excessive thirst and frequent urination, including during the night. She is diagnosed with nocturnal polyuria secondary to diabetes and her diabetes management plan is adjusted., A 40-year-old male with no significant medical history complains of frequent nighttime urination. After ruling out other causes, he is diagnosed with primary nocturnal polyuria and prescribed medication to reduce urine production at night.

Documentation should include the frequency and volume of nighttime urination, any associated symptoms like thirst or pain, relevant medical history, physical exam findings, results of diagnostic tests, and the treatment plan.

** Excludes2: nocturnal enuresis (N39.44). Parent code notes: R35 Excludes1: psychogenic polyuria (F45.8).

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