2026 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 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F81.81 is a billable ICD-10-CM diagnosis code for disorder of written expression. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). 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

Tabular List NotesGuidance

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

Inclusion Terms

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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Agraphia(absolute)
      • developmental
    • Delay, delayed
      • development
        • spelling
    • Development
      • delayed
        • spelling
    • Development
      • delayed
        • written expression
    • Difficult, difficulty(in)
      • spelling (specific)
    • Disability, disabilities
      • spelling, specific
    • Disorder(of)
      • developmental
        • expressive writing
    • Disorder(of)
      • developmental
        • written expression
    • Disorder(of)
      • learning (specific)
        • specified
          • with impairment in
            • written expression
    • Disorder(of)
      • learning (specific)
        • spelling
    • Disorder(of)
      • learning (specific)
        • written expression
    • Disorder(of)
      • specific
        • spelling
    • Disorder(of)
      • specific
        • written expression
    • Disorder(of)
      • spelling (specific)
    • Retardation
      • spelling (specific) (without reading disorder)

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F81.81Overview

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, 2025 through September 30, 2026.

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.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.