2027 ICD-10-CM Diagnosis Code F73Profound intellectual disabilities

ICD-10-CM Codes›F01–F99›F70-F79›F73

ICD-10-CM F73
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F73 is a billable ICD-10-CM diagnosis code for profound intellectual disabilities. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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 2027.

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 2027 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F73: its own notes plus those printed at block F70-F79 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • IQ level below 20-25
  • Profound mental subnormality

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block F70-F79 Intellectual disabilities applies to 7 codes
  • borderline intellectual functioning, IQ above 70 to 84 (R41.83)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Code First

The underlying condition named in the note is sequenced before this code.

From Block F70-F79 Intellectual disabilities applies to 7 codes
  • any associated physical or developmental disorders

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F73, its category, or a range that includes it.

Applicable To 1

These notes mention F73.

  • Z81.0 Family history of intellectual disabilities
    Conditions classifiable to F70-F79 names F70-F79, which includes this code

Excludes1 1

These codes carry an Excludes1 note naming F73: they are not reported together with it, unless the two conditions are unrelated.

  • R41.83 Borderline intellectual functioning
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

Excludes2 4

These codes carry an Excludes2 note naming F73: its condition is not part of those codes, and both may be reported when the patient has both.

  • F80.0 Phonological disorder
    speech articulation impairment due to intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F80.1 Expressive language disorder
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F80.2 Mixed receptive-expressive language disorder
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • F82 Specific developmental disorder of motor function
    lack of coordination secondary to intellectual disabilities (F70-F79) names F70-F79, which includes this code

Code First 1

These codes say to code first a condition named in the note, and F73 is one of the conditions named.

  • Z91.83 Wandering in diseases classified elsewhere
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

Use Additional Code 5

These codes say to use an additional code from the note, and F73 is one of the codes named.

  • E00 Congenital iodine-deficiency syndrome
    code (F70-F79) to identify associated intellectual disabilities. names F70-F79, which includes this code
  • Q87.87 Hao-Fountain Syndrome
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q87.88 CTNNB1 syndrome
    intellectual disability (F70-F79) names F70-F79, which includes this code
  • Q90 Down syndrome
    code(s) to identify any associated degree of intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q93.52 Phelan-McDermid syndrome
    degree of intellectual disabilities (F70-F79) names F70-F79, which includes this code

Code Also 4

These codes say F73 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G93.45 Developmental and epileptic encephalopathy
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Q87.85 MED13L syndrome
    intellectual disability (F70-F79) names F70-F79, which includes this code
  • QA0 Neurodevelopmental disorders related to specific genetic pathogenic variants
    intellectual disabilities (F70-F79) names F70-F79, which includes this code
  • Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders
    intellectual disabilities (F70-F79) names F70-F79, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 1.5998. Higher weights mean higher Medicare reimbursement.

Is F73 a CC or MCC?

CMS lists F73 as a CC (complication or comorbidity) for FY 2027. 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.

Can F73 be reported with R41.83?

Not as a rule. The Excludes1 note at block F70-F79, which applies to F73, lists "borderline intellectual functioning, IQ above 70 to 84 (R41.83)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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).