F81.2 — Mathematics disorder
F81.2 is a billable, specific ICD-10-CM code for mathematics disorder. It is valid for submission on a claim.
Excludes1 — never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- acalculia NOS (R48.8)
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Developmental acalculia
- Developmental arithmetical disorder
- Developmental Gerstmann's syndrome
- Specific learning disorder, with impairment in mathematics
Risk adjustment
F81.2 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
F81.2 is named in 15 Medicare coverage policies — 13 listing it as supporting medical necessity, and 2 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A52434Health and Behavior Assessment/Intervention – Medical Policy Articlenot covered
- A56865Billing and Coding: Psychiatric Inpatient Hospitalizationnot covered
- A52866Billing and Coding: Speech-Language Pathology
- A53064Billing and Coding: Outpatient Occupational Therapy
How F81.2 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to F81.2.
- Acalculia›developmental
- Dyscalculia›developmental
- Gerstmann's syndrome›developmental
- Development›delayed›arithmetical skills
- Disorder›developmental›arithmetical skills
- Disorder›learning›mathematics
- Disorder›specific›arithmetical
- Disorder›developmental›learning›arithmetical
- Disorder›learning›specified›with impairment in›mathematics
Related codes at this level
Codes that share F81. If F81.2 is not quite right, the correct code is usually one of these.
Questions about F81.2
- Is F81.2 a billable ICD-10-CM code?
- Yes. F81.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does F81.2 sit in the tabular list?
- Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Pervasive and specific developmental disorders (F80-F89).
- What cannot be coded together with F81.2?
- F81.2 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.