G47.00 — Insomnia, unspecified

G47.00

ICD-10 Chapter 6: Nervous System — illustrative image — Chapter 6: Diseases of the nervous system (G00–G99) — illustrative image

What this code means

Insomnia is difficulty falling asleep, staying asleep, or waking too early, affecting daytime function.

Also called: insomnia, sleeplessness.

When this code is used

Used for insomnia when the type is not specified.

Where it sits in ICD-10-CM

Code G47.00 belongs to Chapter 6: Diseases of the nervous system, which covers codes G00–G99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

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Frequently asked questions

What is ICD-10-CM code G47.00?

G47.00 is the ICD-10-CM diagnosis code for “Insomnia, unspecified”. Insomnia is difficulty falling asleep, staying asleep, or waking too early, affecting daytime function.

When is code G47.00 used?

Used for insomnia when the type is not specified. It belongs to Chapter 6 of ICD-10-CM (Diseases of the nervous system).

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.