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ICD-10-CM 2027 diagnosis code

F73Profound intellectual disabilities

✓ Billable / specificCC — complication/comorbidity

F73 is a valid, billable ICD-10-CM code for profound intellectual disabilities. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Idiot.

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 F73

F73 is the ICD-10-CM diagnosis code for profound 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 318.2 (profound intellectual disabilities).

Coding notes

Applicable toConditions and synonyms classified to this code
  • IQ level below 20-25
  • Profound mental subnormality

Notes that apply from higher levels

Instructions written at a parent level also apply to F73.

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

Alphabetic index entries

3 entries

Terms in the official ICD-10-CM index that lead to F73.

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 →
  • 318.2Profound 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 F73

Is F73 billable?

Yes. F73 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can F73 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict F73 as a principal diagnosis.

Is F73 a CC or MCC?

F73 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does F73 group to?

F73 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 F73?

The CMS General Equivalence Mappings map F73 to ICD-9-CM 318.2.