R35.1 — Nocturia

R35.1

ICD-10 Chapter 18: Symptoms, Signs & Abnormal Findings — illustrative image — Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00–R99) — illustrative image

What this code means

Nocturia is waking at night to pass urine, common with age, prostate enlargement and some medical conditions.

Also called: nocturia, night-time urination.

When this code is used

Used for nocturia.

Where it sits in ICD-10-CM

Code R35.1 belongs to Chapter 18: Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified, which covers codes R00–R99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Needing to urinate at night

Frequently asked questions

What is ICD-10-CM code R35.1?

R35.1 is the ICD-10-CM diagnosis code for “Nocturia”. Nocturia is waking at night to pass urine, common with age, prostate enlargement and some medical conditions.

When is code R35.1 used?

Used for nocturia. It belongs to Chapter 18 of ICD-10-CM (Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.