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

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
2 inclusion terms

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 886 — BEHAVIORAL AND DEVELOPMENTAL DISORDERS (MDC 19)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for F81.81 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Inclusion Terms

Alternative terms the tabular list files under this code.

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

Code Overview

Disorder of written expression is a billable ICD-10-CM diagnosis code (F81.81).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (15)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name F81.81 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes1 notes across 2 chapters: R48 — Dyslexia and other symbolic dysfunctions, not elsewhere classified (via F81.-), Z55 — Problems related to education and literacy (via F81.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: F81.2 — Mathematics disorder.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 2 Code Also instructions across 2 chapters: G93.45 — Developmental and epileptic encephalopathy (via F81.-), Z15.1 — Genetic susceptibility to epilepsy and neurodevelopmental disorders (via F81.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 1 MS-DRG: DRG 886 (MDC 19).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MBD014 — Neurodevelopmental disorders (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Neurodevelopmental disorders).

F80.0 — Phonological disorder, F80.1 — Expressive language disorder, F80.2 — Mixed receptive-expressive language disorder, F80.4 — Speech and language development delay due to hearing loss, F80.81 — Childhood onset fluency disorder, F80.82 — Social pragmatic communication disorder, F80.89 — Other developmental disorders of speech and language, F80.9 — Developmental disorder of speech and language, unspecified, F81.0 — Specific reading disorder, F81.2 — Mathematics disorder, F81.89 — Other developmental disorders of scholastic skills, F81.9 — Developmental disorder of scholastic skills, unspecified, F82 — Specific developmental disorder of motor function, F84.0 — Autistic disorder, F84.2 — Rett's syndrome, F84.3 — Other childhood disintegrative disorder, F84.5 — Asperger's syndrome, F84.8 — Other pervasive developmental disorders, F84.9 — Pervasive developmental disorder, unspecified, F88 — Other disorders of psychological development, +24 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Retardation”, “Delay, delayed”, “Development”, …; these codes share that main term but sit in a different category of the Tabular List.

F70 — Mild intellectual disabilities (intellectual, mild), F71 — Moderate intellectual disabilities (intellectual, moderate), F72 — Severe intellectual disabilities (intellectual, severe), F73 — Profound intellectual disabilities (intellectual, profound), F78.A1 — SYNGAP1-related intellectual disability (intellectual, SYNGAP1-related), F78.A9 — Other genetic related intellectual disability (intellectual, X-linked), F79 — Unspecified intellectual disabilities (tardy, mental), F80.1 — Expressive language disorder (delayed, language), F80.4 — Speech and language development delay due to hearing loss (development, speech, due to hearing loss), F80.9 — Developmental disorder of speech and language, unspecified (delayed, speech), F82 — Specific developmental disorder of motor function (motor function, specific), F84.9 — Pervasive developmental disorder, unspecified (development, pervasive), F88 — Other disorders of psychological development (delayed, mixed skills), F93.9 — Childhood emotional disorder, unspecified (reading, secondary to emotional disorders), F98.29 — Other feeding disorders of infancy and early childhood (feeding, nonorganic), G47.21 — Circadian rhythm sleep disorder, delayed sleep phase type (sleep phase syndrome), I45.9 — Conduction disorder, unspecified (conduction), K30 — Functional dyspepsia (gastric emptying), K91.30 — Postprocedural intestinal obstruction, unspecified as to partial versus complete (mechanical, gastroduodenal stoma, causing obstruction), K91.89 — Other postprocedural complications and disorders of digestive system (mechanical, gastroduodenal stoma), +43 more

Contextual Map

Every relationship of F81.81 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run F81.81 with these 5 related codes in Claim Check

Hierarchy

Referenced by Excludes1 notes

Referenced by Excludes2 notes

  • F81.2 — Mathematics disorder[Excludes2]: “arithmetical difficulties associated with a spelling disorder (F81.81)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 19 — Mental Diseases and Disorders[MDC crossing]: “Mental Diseases and Disorders — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2027

Index entries (15)

  • Agraphia (absolute), developmental[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Delay, delayed, development, spelling[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Development, delayed, spelling[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Development, delayed, written expression[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Difficult, difficulty (in), spelling (specific)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Disability, disabilities, spelling, specific[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Disorder (of), developmental, expressive writing[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • Disorder (of), developmental, written expression[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
  • and 7 more

Nearest codes

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "F81.81 — Disorder of written expression." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/f81.81-disorder-of-written-expression

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Disorder of written expression

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to F81.81 in its code family, with their registry titles.

View all codes in the F81 family