Alphabetic Index FY2027

F80.0

Phonological disorder

FY2027Chapter 5: Mental, Behavioral and Neurodevelopmental disorders/F80–F89 Pervasive and specific developmental disorders

BillableComplete code, valid to report
Care settingsHome Health Primary · Behavioral HealthIPF Primary · MS-DRG 886

F80.0 (also written F800) is a billable ICD-10-CM diagnosis code for phonological disorder. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 8 codes in category F80 (Specific developmental disorders of speech and language). The Alphabetic Index lists it under 8 entries. Its coding notes include 2 Excludes1 entries and 5 Excludes2 entries.

Excludes1

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

This code
  • speech articulation impairment due to aphasia NOS (R47.01)
  • speech articulation impairment due to apraxia (R48.2)

Excludes2

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

This code
  • speech articulation impairment due to hearing loss (F80.4)
  • speech articulation impairment due to intellectual disabilities (F70-F79)
  • speech articulation impairment with expressive language developmental disorder (F80.1)
  • speech articulation impairment with mixed receptive expressive language developmental disorder (F80.2)
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
886Behavioral & developmental disorders1.07
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
  • Dyslalia
  • Functional speech articulation disorder
  • Lalling
  • Lisping
  • Phonological developmental disorder
  • Speech articulation developmental disorder
  • Speech-sound disorder

Alphabetic Index terms

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