T27.7XXA ICD-10-CM Code: Corrosion of respiratory tract, part unspecified, initial encounter
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.
- MS-DRG 205 — OTHER RESPIRATORY SYSTEM DIAGNOSES WITH MCC (MDC 04)
- MS-DRG 206 — OTHER RESPIRATORY SYSTEM DIAGNOSES WITHOUT MCC (MDC 04)
- MS-DRG 928 — FULL THICKNESS BURN WITH SKIN GRAFT OR INHALATION INJURY WITH CC/MCC (MDC 22)
- MS-DRG 929 — FULL THICKNESS BURN WITH SKIN GRAFT OR INHALATION INJURY WITHOUT CC/MCC (MDC 22)
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
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for T27.7XXA in the official ICD-10-CM tabular list.
Code First
Underlying conditions that must be sequenced before this code.
- (T51-T65) to identify chemical and intent
Use Additional Code
Supplementary codes the tabular list directs you to add.
- external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98)
- external cause code to identify place (Y92)
Frequently Asked Questions (FAQ) & Clinical Guidance
Does T27.7XXA require a 7th character?
Yes. The appropriate 7th character is to be added to each code from category T27.
Nearest Codes in This Family
Official ICD-10-CM classifications closest to T27.7XXA in its code family, with their registry titles.
- T27.5XXA — Corrosion involving larynx and trachea with lung, initial encounter
- T27.5XXD — Corrosion involving larynx and trachea with lung, subsequent encounter
- T27.5XXS — Corrosion involving larynx and trachea with lung, sequela
- T27.6 — Corrosion of other parts of respiratory tract
- T27.6XXA — Corrosion of other parts of respiratory tract, initial encounter
- T27.6XXD — Corrosion of other parts of respiratory tract, subsequent encounter
- T27.6XXS — Corrosion of other parts of respiratory tract, sequela
- T27.7 — Corrosion of respiratory tract, part unspecified
- T27.7XXD — Corrosion of respiratory tract, part unspecified, subsequent encounter
- T27.7XXS — Corrosion of respiratory tract, part unspecified, sequela