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ICD-10/T20.77XD

T20.77XD ICD-10-CM Code: Corrosion of third degree of neck, subsequent 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, 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.

Official Registry Overview & Definition

Corrosion of third degree of neck, subsequent encounter is a billable ICD-10-CM diagnosis code (T20.77D).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T20.77XD in the official ICD-10-CM tabular list.

Includes

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

  • 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]

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.

Referenced by Other Codes

Clinical classification (AHRQ CCSR):INJ056 — Burns and corrosion, subsequent encounter (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 949 (MDC 23), DRG 950 (MDC 23).

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 T20.77XD or its code family.

2 Excludes1 notes: T07 (via T20.-), T66 (via T20.-).

121 Excludes2 notes: S00 (via T20.-), S00-S09 (via T20.-), S01 (via T20.-), S02 (via T20.-), S03 (via T20.-), S04 (via T20.-), S05 (via T20.-), S06 (via T20.-), S07 (via T20.-), S08 (via T20.-) and 111 more.

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T20.77XD require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T20.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T20.77XD in its code family, with their registry titles.

  • T20.76 — Corrosion of third degree of forehead and cheek
  • T20.76XA — Corrosion of third degree of forehead and cheek, initial encounter
  • T20.76XD — Corrosion of third degree of forehead and cheek, subsequent encounter
  • T20.76XS — Corrosion of third degree of forehead and cheek, sequela
  • T20.77 — Corrosion of third degree of neck
  • T20.77XA — Corrosion of third degree of neck, initial encounter
  • T20.77XS — Corrosion of third degree of neck, sequela
  • T20.79 — Corrosion of third degree of multiple sites of head, face, and neck
  • T20.79XA — Corrosion of third degree of multiple sites of head, face, and neck, initial encounter
  • T20.79XD — Corrosion of third degree of multiple sites of head, face, and neck, subsequent encounter

View all codes in the T20 family