ICD-10-CM diagnosis code
T20.59XD Corrosion of first degree of multiple sites of head, face, and neck, subsequent encounter
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for a subsequent encounter: active treatment is complete and the patient is being seen during healing or recovery (for example a cast change, medication adjustment or follow-up visit).
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Other codes in T20
264 complete codes in this category.
- T20.56XDCorrosion of first degree of forehead and cheek, subsequent encounter
- T20.56XSCorrosion of first degree of forehead and cheek, sequela
- T20.57XACorrosion of first degree of neck, initial encounter
- T20.57XDCorrosion of first degree of neck, subsequent encounter
- T20.57XSCorrosion of first degree of neck, sequela
- T20.59XACorrosion of first degree of multiple sites of head, face, and neck, initial encounter
- T20.59XDCorrosion of first degree of multiple sites of head, face, and neck, subsequent encounter
- T20.59XSCorrosion of first degree of multiple sites of head, face, and neck, sequela
- T20.60XACorrosion of second degree of head, face, and neck, unspecified site, initial encounter
- T20.60XDCorrosion of second degree of head, face, and neck, unspecified site, subsequent encounter
- T20.60XSCorrosion of second degree of head, face, and neck, unspecified site, sequela
- T20.611ACorrosion of second degree of right ear [any part, except ear drum], initial encounter
Documentation tips
- Make sure the note supports every element of the title, “Corrosion of first degree of multiple sites of head, face, and neck, subsequent encounter”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to T20.
The international WHO ICD-10 also has T20, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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