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ICD-10-CM · FY 2026 APRIL UPDATE

T23.4

Corrosion of unspecified degree of wrist and hand

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

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

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
T23.40Corrosion of unspecified degree of hand, unspecified siteCategory
T23.401Corrosion of unspecified degree of right hand, unspecified siteCategory
T23.401ACorrosion of unspecified degree of right hand, unspecified site, initial encounterBillable
T23.401DCorrosion of unspecified degree of right hand, unspecified site, subsequent encounterBillable
T23.401SCorrosion of unspecified degree of right hand, unspecified site, sequelaBillable
T23.402Corrosion of unspecified degree of left hand, unspecified siteCategory
T23.402ACorrosion of unspecified degree of left hand, unspecified site, initial encounterBillable
T23.402DCorrosion of unspecified degree of left hand, unspecified site, subsequent encounterBillable
T23.402SCorrosion of unspecified degree of left hand, unspecified site, sequelaBillable
T23.409Corrosion of unspecified degree of unspecified hand, unspecified siteCategory
T23.409ACorrosion of unspecified degree of unspecified hand, unspecified site, initial encounterBillable
T23.409DCorrosion of unspecified degree of unspecified hand, unspecified site, subsequent encounterBillable
T23.409SCorrosion of unspecified degree of unspecified hand, unspecified site, sequelaBillable
T23.41Corrosion of unspecified degree of thumb (nail)Category
T23.411Corrosion of unspecified degree of right thumb (nail)Category
T23.411ACorrosion of unspecified degree of right thumb (nail), initial encounterBillable
T23.411DCorrosion of unspecified degree of right thumb (nail), subsequent encounterBillable
T23.411SCorrosion of unspecified degree of right thumb (nail), sequelaBillable
T23.412Corrosion of unspecified degree of left thumb (nail)Category
T23.412ACorrosion of unspecified degree of left thumb (nail), initial encounterBillable
T23.412DCorrosion of unspecified degree of left thumb (nail), subsequent encounterBillable
T23.412SCorrosion of unspecified degree of left thumb (nail), sequelaBillable
T23.419Corrosion of unspecified degree of unspecified thumb (nail)Category
T23.419ACorrosion of unspecified degree of unspecified thumb (nail), initial encounterBillable
T23.419DCorrosion of unspecified degree of unspecified thumb (nail), subsequent encounterBillable
T23.419SCorrosion of unspecified degree of unspecified thumb (nail), sequelaBillable
T23.42Corrosion of unspecified degree of single finger (nail) except thumbCategory
T23.421Corrosion of unspecified degree of single right finger (nail) except thumbCategory
T23.421ACorrosion of unspecified degree of single right finger (nail) except thumb, initial encounterBillable
T23.421DCorrosion of unspecified degree of single right finger (nail) except thumb, subsequent encounterBillable

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.

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