Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Corrosions involving 20-29% of body surface with 0% to 9% third degree corrosion is a billable ICD-10-CM diagnosis code (T32.20).

Official ICD-10-CM classifications closest to T32.20 in its code family, with their registry titles.

T32.0 — Corrosions involving less than 10% of body surface
T32.1 — Corrosions involving 10-19% of body surface
T32.10 — Corrosions involving 10-19% of body surface with 0% to 9% third degree corrosion
T32.11 — Corrosions involving 10-19% of body surface with 10-19% third degree corrosion
T32.2 — Corrosions involving 20-29% of body surface
T32.21 — Corrosions involving 20-29% of body surface with 10-19% third degree corrosion
T32.22 — Corrosions involving 20-29% of body surface with 20-29% third degree corrosion
T32.3 — Corrosions involving 30-39% of body surface
T32.30 — Corrosions involving 30-39% of body surface with 0% to 9% third degree corrosion
T32.31 — Corrosions involving 30-39% of body surface with 10-19% third degree corrosion

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), extent (percentage of body surface), 20-29 percent (0-9 percent third degree)
Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal), unspecified site with extent of body surface involved specified, 20-29 percent (0-9 percent third degree)