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ICD-10/T34.71XA

T34.71XA ICD-10-CM Code: Frostbite with tissue necrosis of right knee and lower leg, 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, Appendix B.

  • MS-DRG 922 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITH MCC (MDC 21)
  • MS-DRG 923 — OTHER INJURY, POISONING AND TOXIC EFFECT DIAGNOSES WITHOUT MCC (MDC 21)

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

Frostbite with tissue necrosis of right knee and lower leg, initial encounter is a billable ICD-10-CM diagnosis code (T34.71A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T34.71XA in the official ICD-10-CM tabular list.

Excludes2 — Not Included Here

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

Change history

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

Verify Before Coding

  • Billable — reportable as written.
  • CC as a secondary diagnosis (FY2026). Can raise the stay's MS-DRG severity tier.

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

Relationships & Classification

Clinical classification (AHRQ CCSR):INJ021 — Effect of other external causes, initial 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)

CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 77 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 2 MS-DRGs: DRG 922 (MDC 21), DRG 923 (MDC 21).

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

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T34.71XA require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T34.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T34.71XA in its code family, with their registry titles.

  • T34.70 — Frostbite with tissue necrosis of unspecified knee and lower leg
  • T34.70XA — Frostbite with tissue necrosis of unspecified knee and lower leg, initial encounter
  • T34.70XD — Frostbite with tissue necrosis of unspecified knee and lower leg, subsequent encounter
  • T34.70XS — Frostbite with tissue necrosis of unspecified knee and lower leg, sequela
  • T34.71 — Frostbite with tissue necrosis of right knee and lower leg
  • T34.71XD — Frostbite with tissue necrosis of right knee and lower leg, subsequent encounter
  • T34.71XS — Frostbite with tissue necrosis of right knee and lower leg, sequela
  • T34.72 — Frostbite with tissue necrosis of left knee and lower leg
  • T34.72XA — Frostbite with tissue necrosis of left knee and lower leg, initial encounter
  • T34.72XD — Frostbite with tissue necrosis of left knee and lower leg, subsequent encounter

View all codes in the T34 family