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ICD-10/T21.71XS

T21.71XS ICD-10-CM Code: Corrosion of third degree of chest wall, sequela

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, Appendix B.

  • MS-DRG 604 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC (MDC 09)
  • MS-DRG 605 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC (MDC 09)

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.

Official Registry Overview & Definition

Corrosion of third degree of chest wall, sequela is a billable ICD-10-CM diagnosis code (T21.71S).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T21.71XS in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • burns and corrosion of hip region
  • burns and corrosions of first degree [erythema]
  • burns and corrosions of second degree [blisters][epidermal loss]
  • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Corrosion of third degree of breast

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

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 place (Y92)
  • Use additional code from category T31 or T32 to identify extent of body surface involved

Change history

No changes recorded for this code — unchanged since the FY2016 baseline of the change ledger.

Verify Before Coding

  • Billable — reportable as written.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of T21.71XS in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • T20-T25 — Burns and corrosions of external body surface, specified by site [Hierarchy]

Referenced by Excludes2 notes

  • T22 — Burn and corrosion of shoulder and upper limb, except wrist and hand [Excludes2](via T21.-): “burn and corrosion of interscapular region (T21.-)”
  • T24 — Burn and corrosion of lower limb, except ankle and foot [Excludes2](via T21.-): “burn and corrosion of hip region (T21.-)”

Clinical classification (CCSR)

  • INJ073 — Injury, sequela [CCSR]

Potential MS-DRG

  • DRG 604 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC [MS-DRG]: “TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITH MCC (MDC 09)”
  • DRG 605 — TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC [MS-DRG]: “TRAUMA TO THE SKIN, SUBCUTANEOUS TISSUE AND BREAST WITHOUT MCC (MDC 09)”

Nearest codes (40)

  • T21 — Burn and corrosion of trunk [Sibling]
  • T21.66 — Corrosion of second degree of male genital region [Sibling]
  • T21.66XA — Corrosion of second degree of male genital region, initial encounter [Sibling]
  • T21.66XD — Corrosion of second degree of male genital region, subsequent encounter [Sibling]
  • T21.66XS — Corrosion of second degree of male genital region, sequela [Sibling]
  • T21.67 — Corrosion of second degree of female genital region [Sibling]
  • T21.67XA — Corrosion of second degree of female genital region, initial encounter [Sibling]
  • T21.67XD — Corrosion of second degree of female genital region, subsequent encounter [Sibling]
  • and 32 more

Referenced by Other Codes

Clinical classification (AHRQ CCSR):INJ073 — Injury, sequela (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 2 MS-DRGs: DRG 604 (MDC 09), DRG 605 (MDC 09).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name T21.71XS or its code family.

2 Excludes2 notes: T22 (via T21.-), T24 (via T21.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T21.71XS require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T21.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T21.71XS in its code family, with their registry titles.

  • T21.70XD — Corrosion of third degree of trunk, unspecified site, subsequent encounter
  • T21.70XS — Corrosion of third degree of trunk, unspecified site, sequela
  • T21.71 — Corrosion of third degree of chest wall
  • T21.71XA — Corrosion of third degree of chest wall, initial encounter
  • T21.71XD — Corrosion of third degree of chest wall, subsequent encounter
  • T21.72 — Corrosion of third degree of abdominal wall
  • T21.72XA — Corrosion of third degree of abdominal wall, initial encounter
  • T21.72XD — Corrosion of third degree of abdominal wall, subsequent encounter
  • T21.72XS — Corrosion of third degree of abdominal wall, sequela
  • T21.73 — Corrosion of third degree of upper back

View all codes in the T21 family