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ICD-10-CM · FY 2026 APRIL UPDATE

T43.636A

Underdosing of methylphenidate, initial encounter

Diagnosis reference

Billable code

This entry is marked billable in the official CMS order file. Confirm the complete clinical documentation and tabular instructions before selecting it.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.