2027 ICD-10-CM Diagnosis Code F81.81Disorder of written expression

ICD-10-CM Codes›F01–F99›F80-F89›F81

ICD-10-CM F81.81
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F81.81 is a billable ICD-10-CM diagnosis code for disorder of written expression. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 886. Coders also document this condition as basic learning problem. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neurodevelopmental disorders.

Code Identity

ICD-10-CM Code
F81.81
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of written expression
Short Description
Disorder of written expression
Same as the full description in the CMS dataset.
Parent Code
F81.8
Other developmental disorders of scholastic skills

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF80-F89Pervasive and specific developmental disorders
CategoryF81Specific developmental disorders of scholastic skills
This CodeF81.81Disorder of written expression

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Basic learning problem
  • Basic learning problem in writing
  • Developmental expressive writing disorder
  • Difficulty performing writing activities
  • Difficulty writing
  • Finding related to ability to perform writing activities
  • Finding related to ability to write
  • Micrographia
  • Specific spelling disorder

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F81.81: its own notes plus those printed at 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.

  • Specific learning disorder, with impairment in written expression
  • Specific spelling disorder

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)

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F81.81, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming F81.81: they are not reported together with it, unless the two conditions are unrelated.

  • R48 Dyslexia and other symbolic dysfunctions, not elsewhere classified
    specific developmental disorders of scholastic skills (F81.-) names F81.-, which includes this code
  • Z55 Problems related to education and literacy
    disorders of psychological development (F80-F89) names F80-F89, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming F81.81: its condition is not part of those codes, and both may be reported when the patient has both.

  • F81.2 Mathematics disorder
    arithmetical difficulties associated with a spelling disorder (F81.81)

Code Also 2

These codes say F81.81 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • G93.45 Developmental and epileptic encephalopathy
    developmental disorders of scholastic skills (F81.-) names F81.-, which includes this code
  • Z15.1 Genetic susceptibility to epilepsy and neurodevelopmental disorders
    developmental disorders of scholastic skills (F81.-) names F81.-, 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

Learning Disabilities

Learning disabilities are conditions that affect the ability to learn. They can cause problems with:

The full article covers:

  • What is a learning disability?
  • What causes learning disabilities?
  • How are learning disabilities diagnosed?
  • What are the treatments for learning disabilities?

Read the full article at MedlinePlus

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

Convert F81.81 to ICD-9-CMHistory

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

ICD-9-CM
315.09 Reading disorder NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
315.2 Oth learning difficulty
Approximate The match is approximate rather than exact.

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 F81.81Overview

What is the ICD-10 code for disorder of written expression?

The ICD-10-CM code for disorder of written expression is F81.81 (sometimes written as F8181). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F81.81 (Other developmental disorders of scholastic skills) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorder of written expression on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F81.81 group to?

When disorder of written expression is the principal diagnosis on an inpatient stay, it groups to MS-DRG 886 (behavioral and Developmental Disorders), which carries a relative weight of 1.6455. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of F81.81?

Under the General Equivalence Mappings, disorder of written expression converts to ICD-9-CM 315.09 (reading disorder NEC) and 315.2 (oth learning difficulty). The mapping is approximate, so confirm the match fits the documentation.