Alphabetic Index FY2027

F64.2

Gender identity disorder of childhood

FY2027Chapter 5: Mental, Behavioral and Neurodevelopmental disorders/F60–F69 Disorders of adult personality and behavior

BillableComplete code, valid to report
Care settingsHome Health Primary · Behavioral HealthIPF Primary · MS-DRG 887

F64.2 (also written F642) is a billable ICD-10-CM diagnosis code for gender identity disorder of childhood. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 6 codes in category F64 (Gender identity disorders). The Alphabetic Index lists it under 8 entries. Its coding notes include 1 Excludes1 entry and 2 Excludes2 entries.

Excludes1

Not coded here. The listed conditions generally should not be reported together.

This code
  • gender identity disorder in adolescence and adulthood (F64.0)

Excludes2

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

This code
  • sexual maturation disorder (F66)
Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

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 Behavioral Health 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-DRGDescriptionFactor
887Other mental disorder diagnoses1.00
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

Includes

Further defines or gives examples of the content of the category.

Also from chapter/block level (1 note)
Inherited from Chapter 5 Mental, Behavioral and Neurodevelopmental disorders
  • disorders of psychological development

Inclusion terms

Conditions classified to this code.

This code
  • Gender dysphoria in children
  • Gender incongruence of childhood

Alphabetic Index terms

Terms the official Alphabetic Index lists for this code. 8 entries