G47.00

Insomnia, unspecified

FY2027Chapter 6: Diseases of the nervous system/G40–G47 Episodic and paroxysmal disorders

BillableComplete code, valid to report

Excludes2

Care settingsHome Health Primary · MMTA - Other IPF Primary · MS-DRG 887

G47.00 (also written G4700) is a billable ICD-10-CM diagnosis code for insomnia, unspecified. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 43 codes in category G47 (Sleep disorders). The Alphabetic Index lists it under 1 entry. Its coding notes include 20 Excludes2 entries.

Excludes2

Not included here. Both codes may be reported if the patient has both conditions.

Inherited from G47.0 Insomnia

alcohol related insomnia (F10.182, F10.282, F10.982)
drug-related insomnia (F11.182, F11.282, F11.982, F13.182, F13.282, F13.982, F14.182, F14.282, F14.982, F15.182, F15.282, F15.982, F19.182, F19.282, F19.982)
idiopathic insomnia (F51.01)
insomnia due to a mental disorder (F51.05)
insomnia not due to a substance or known physiological condition (F51.0-)
nonorganic insomnia (F51.0-)
primary insomnia (F51.01)
sleep apnea (G47.3-)

Inherited from G47 Sleep disorders

nightmares (F51.5)
nonorganic sleep disorders (F51.-)
sleep terrors (F51.4)
sleepwalking (F51.3)

Also from chapter/block level (8 notes)

Inherited from Chapter 6 Diseases of the nervous system

certain conditions originating in the perinatal period (P04-P96)
certain infectious and parasitic diseases (A00-B99)
complications of pregnancy, childbirth and the puerperium (O00-O9A)
congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
endocrine, nutritional and metabolic diseases (E00-E88)
injury, poisoning and certain other consequences of external causes (S00-T88)
neoplasms (C00-D49)
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Care settings

How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.

Home Health Primary

Accepted as the primary (principal) diagnosis on a home health claim. The Home Health Grouper assigns it to the MMTA - Other clinical group.

Source: CMS Home Health Grouper Software v07.2.26, effective October 1, 2026

IPF Primary

IPF MS-DRG adjustment. A principal diagnosis of this code groups to this MS-DRG:

MS-DRG	Description	Factor
887	Other mental disorder diagnoses	1.00

A principal diagnosis that groups to none of the 19 designated MS-DRGs gets no MS-DRG adjustment. Otherwise the claim still receives the federal per diem base rate and the other adjustments.

Source: CMS IPF PPS FY 2027 final rule (CMS-1847-F), Addendum A; code lists from the CMS MS-DRG Definitions Manual v44; effective for discharges on or after October 1, 2026

Inclusion terms

Conditions classified to this code.

This code

Insomnia NOS

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 1 entry

Insomnia (organic)