Wiki Nocturia vs. Nocturnal Polyuria

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A patient has a DX of nocturnal polyuria and there is some debate of how it should be coded. The patient was able to provide a 24 hour urine diary. The patient wakes up more than three times per night. Patient's urine production at night exceeds one-third of 24 hour urine volume. According to ICD-10-CM, "Polyuria, nocturnal" is R35.1 in the alpha index. When you go to the tabular list, it is the same code for "Nocturia". Should this be coded as R35.1 or "Other Polyuria", R35.8? When I looked up the DX on CMS.gov, it was listed as R35.81, but there is no such code.

Any help and insight would be helpful.
 
If the Alphabetic index directs you to a specific code, that's what you should use - you would only change to another code if the Tabular List directs you to a more specific selection, or if an instructional note requires you to code elsewhere.

Since 'Polyuria, nocturnal' already directs you to a specific code, there would be no reason to change this to the less specific 'Other Polyuria' code. R35.1 is correct here.
 
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