2026 ICD-10-CM Diagnosis Code F73Profound intellectual disabilities

ICD-10-CM Codes›F01–F99›F70-F79›F73

ICD-10-CM F73
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F73 is a billable ICD-10-CM diagnosis code for profound intellectual disabilities. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 884. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 2 closely related codes. Coders also document this condition as profound intellectual disability. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.

F73 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 146 for payment year 2026.

Code Identity

ICD-10-CM Code
F73
Billable Status
Yes — Valid for Submission
Code Describes
Profound intellectual disabilities
Short Description
Profound intellectual disabilities
Same as the full description in the CMS dataset.
Chapter
F70-F79
Intellectual disabilities

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF70-F79Intellectual disabilities
CategoryF73Profound intellectual disabilities
This CodeF73Profound intellectual disabilities

Medicare Risk Adjustment (HCC)Billing

F73 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
no payment category in the model that pays 100% of MA risk scores
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
RxHCC 146 — Profound or Severe Intellectual Disability/Developmental Disorder
also risk-adjusts in the Part D prescription drug model (V08)

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Profound intellectual disability

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • IQ level below 20-25
  • Profound mental subnormality

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD014
Neurodevelopmental disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Developmental Disabilities

Developmental disabilities are conditions that are usually present at birth. They can affect a child's growth and development. These conditions can cause physical, learning, language, or behavior issues. They can include:

The full article covers:

  • What are developmental disabilities?
  • What causes developmental disabilities?
  • How are developmental disabilities diagnosed?
  • What are the treatments for developmental disabilities?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F73 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
318.2 Profnd intellct disablty
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F73Overview

What is the ICD-10 code for profound intellectual disabilities?

The ICD-10-CM code for profound intellectual disabilities is F73. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is F73 (Profound intellectual disabilities) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report profound intellectual disabilities on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does F73 group to?

When profound intellectual disabilities is the principal diagnosis on an inpatient stay, it groups to MS-DRG 884 (organic Disturbances and Intellectual Disability), which carries a relative weight of 1.6089. Higher weights mean higher Medicare reimbursement.

Is F73 a CC or MCC?

CMS lists F73 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 2 closely related codes in its exclusion list.

What is the ICD-9 equivalent of F73?

Under the General Equivalence Mappings, profound intellectual disabilities converts to ICD-9-CM 318.2 (profnd intellct disablty). The mapping is a direct match.

Does F73 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage: F73 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 146 (Profound or Severe Intellectual Disability/Developmental Disorder).