DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

F81 Specific developmental disorders of scholastic skills

  • Header · not billable

F81 is not billable. The category heads 5 billable codes in FY2027, grouped under 4 subdivisions.

Index → code

  • Mirror writing → F81.0
  • Strephosymbolia → F81.0
  • Learning defect (specific) → F81.9

Where it sits

  1. Chapter 5 Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
  2. F80-F89 Pervasive and specific developmental disorders (F80-F89)
  3. F81 Specific developmental disorders of scholastic skills
Billable codes
5
Subdivisions
4
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
56

Codes in F81

  1. F81.0
    Specific reading disorder
    Billable
    Inclusion terms 4, Excludes1 2

    Inclusion terms

    • 'Backward reading'
    • Developmental dyslexia
    • Specific learning disorder, with impairment in reading
    • Specific reading retardation

    Excludes1

    • alexia NOS (R48.0) R48.0
    • dyslexia NOS (R48.0) R48.0
  2. F81.2
    Mathematics disorder
    Billable
    Inclusion terms 4, Excludes1 1, Excludes2 3

    Inclusion terms

    • Developmental acalculia
    • Developmental arithmetical disorder
    • Developmental Gerstmann's syndrome
    • Specific learning disorder, with impairment in mathematics

    Excludes1

    • acalculia NOS (R48.8) R48.8

    Excludes2

    • arithmetical difficulties associated with a reading disorder (F81.0) F81.0
    • arithmetical difficulties associated with a spelling disorder (F81.81) F81.81
    • arithmetical difficulties due to inadequate teaching (Z55.8) Z55.8
  3. F81.8
    Other developmental disorders of scholastic skills
    Header
  4. F81.81
    Disorder of written expression
    Billable
    Inclusion terms 2

    Inclusion terms

    • Specific learning disorder, with impairment in written expression
    • Specific spelling disorder
  5. F81.89
    Other developmental disorders of scholastic skills
    Billable
  6. F81.9
    Developmental disorder of scholastic skills, unspecified
    Billable
    Inclusion terms 3

    Inclusion terms

    • Knowledge acquisition disability NOS
    • Learning disability NOS
    • Learning disorder NOS

Sources of each column.

Instructions

Notes that also apply

Chapter 5 instructions (Includes 1, Excludes2 1): printed on the chapter 5 page.

Index entries

  • Backward reading (dyslexia) → F81.0
  • Mirror writing → F81.0
  • Strephosymbolia → F81.0
  • Learning defect (specific) → F81.9
  • Alexiadevelopmental → F81.0
  • Blindness (acquired) (congenital) (both eyes)word (developmental) → F81.0
  • Difficult, difficulty (in)reading (developmental) → F81.0
  • Dyslexiadevelopmental → F81.0
  • Retardationreading (specific) → F81.0
  • Wordblindness (congenital) (developmental) → F81.0
  • Acalculiadevelopmental → F81.2
  • Dyscalculiadevelopmental → F81.2
  • Gerstmann's syndromedevelopmental → F81.2
  • Agraphia (absolute)developmental → F81.81
  • Difficult, difficulty (in)spelling (specific) → F81.81
  • Disability, disabilitiesspelling, specific → F81.81
  • Disorder (of)spelling (specific) → F81.81
  • Retardationspelling (specific) (without reading disorder) → F81.81
  • Disability, disabilitiesknowledge acquisition → F81.9
  • Disability, disabilitieslearning → F81.9
  • Disorder (of)learning (specific) → F81.9
  • Problem (with) (related to)learning (developmental) → F81.9
  • Delay, delayeddevelopmentreading → F81.0
  • Developmentdelayedreading → F81.0
  • Disorder (of)developmentalreading → F81.0
  • Disorder (of)learning (specific)reading → F81.0
  • Disorder (of)readingdevelopmental (specific) → F81.0
  • Disorder (of)specificreading → F81.0
  • Developmentdelayedarithmetical skills → F81.2
  • Disorder (of)developmentalarithmetical skills → F81.2
  • Disorder (of)learning (specific)mathematics → F81.2
  • Disorder (of)specificarithmetical → F81.2
  • Delay, delayeddevelopmentspelling → F81.81
  • Developmentdelayedspelling → F81.81
  • Developmentdelayedwritten expression → F81.81
  • Disorder (of)developmentalexpressive writing → F81.81
  • Disorder (of)developmentalwritten expression → F81.81
  • Disorder (of)learning (specific)spelling → F81.81
  • Disorder (of)learning (specific)written expression → F81.81
  • Disorder (of)specificspelling → F81.81

16 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy