F79 Unspecified intellectual disabilities

BillableNo payment HCCChapter 5

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Instructional notes

Chapter 5

Excludes2Not included here: the patient may have both; report both when both are present.

symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Includes

disorders of psychological development

Section F70-F79

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.

borderline intellectual functioning, IQ above 70 to 84 (R41.83)

Code firstSequence the underlying condition first.

any associated physical or developmental disorders

This code

Inclusion terms

Mental deficiency NOS
Mental subnormality NOS

Chapter 5: Mental, Behavioral and Neurodevelopmental disorders · F70-F79 Intellectual Disabilities (F70-F79)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.