F81.2Mathematics disorder

F81.2 is the ICD-10-CM diagnosis code for Mathematics disorder. It belongs to category F81 (specific developmental disorders of scholastic skills), block F80-F89 (pervasive and specific developmental disorders) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within F81 (specific developmental disorders of scholastic skills), F81.2 is specifically for Mathematics disorder. Related codes cover specific reading disorder (F81.0), other developmental disorders of scholastic skills (F81.8) and developmental disorder of scholastic skills, unspecified (F81.9).

Don't report F81.2 together with the conditions in its Excludes1 note: acalculia NOS (R48.8).

The conditions in its Excludes2 note aren't part of F81.2, but may be coded alongside it if the patient has both: arithmetical difficulties associated with a reading disorder (F81.0), arithmetical difficulties associated with a spelling disorder (F81.81) and arithmetical difficulties due to inadequate teaching (Z55.8).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 886 (Behavioral and Developmental Disorders, relative weight 1.8678), in MDC 19 (Mental Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 315.1 (Mathematics disorder).