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ICD-10-CM 2027 diagnosis code

F72Severe intellectual disabilities

✓ Billable / specificCC — complication/comorbidity

F72 is a valid, billable ICD-10-CM code for severe intellectual disabilities. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About F72

F72 is the ICD-10-CM diagnosis code for severe intellectual disabilities. It belongs to block F70-F79 (intellectual Disabilities) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 884 (Organic Disturbances and Intellectual Disability, relative weight 1.6001), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 318.1 (severe intellectual disabilities).

Coding notes

Applicable toConditions and synonyms classified to this code
  • IQ 20-25 to 35-40
  • Severe mental subnormality

Notes that apply from higher levels

Instructions written at a parent level also apply to F72.

Broader instructions also apply from F70-F79 Intellectual Disabilities and Chapter 5: Mental, Behavioral and Neurodevelopmental disorders.

Alphabetic index entries

2 entries

Terms in the official ICD-10-CM index that lead to F72.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 318.1Severe intellectual disabilitiesexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about F72

Is F72 billable?

Yes. F72 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F72 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F72 as a principal diagnosis.

Is F72 a CC or MCC?

F72 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does F72 group to?

F72 is used in the MS-DRG v44.0 logic for MS-DRG 884 (Organic Disturbances and Intellectual Disability). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for F72?

The CMS General Equivalence Mappings map F72 to ICD-9-CM 318.1.