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T34.90XS ICD-10-CM Code: Frostbite with tissue necrosis of unspecified sites, 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 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 unspecified sites, sequela is a billable ICD-10-CM diagnosis code (T34.90S).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T34.90XS in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Frostbite with tissue necrosis NOS

Excludes2 — Not Included Here

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

Frequently Compared Codes

The official Excludes notes on T34.90XS name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

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

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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

Relationships & Classification

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 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.

Clinical classification (AHRQ CCSR):INJ074 — Effect of other external causes, sequela (default).

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

Related Codes

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

T34.90XA — Frostbite with tissue necrosis of unspecified sites, initial encounter Compare T34.90XS vs T34.90XA →, T34.90XD — Frostbite with tissue necrosis of unspecified sites, subsequent encounter

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Effect of other external causes, sequela).

T34.72XS — Frostbite with tissue necrosis of left knee and lower leg, sequela, T34.811S — Frostbite with tissue necrosis of right ankle, sequela, T34.812S — Frostbite with tissue necrosis of left ankle, sequela, T34.819S — Frostbite with tissue necrosis of unspecified ankle, sequela, T34.821S — Frostbite with tissue necrosis of right foot, sequela, T34.822S — Frostbite with tissue necrosis of left foot, sequela, T34.829S — Frostbite with tissue necrosis of unspecified foot, sequela, T34.831S — Frostbite with tissue necrosis of right toe(s), sequela, T34.832S — Frostbite with tissue necrosis of left toe(s), sequela, T34.839S — Frostbite with tissue necrosis of unspecified toe(s), sequela, T34.99XS — Frostbite with tissue necrosis of other sites, sequela, T66.XXXS — Radiation sickness, unspecified, sequela, T67.01XS — Heatstroke and sunstroke, sequela, T67.02XS — Exertional heatstroke, sequela, T67.09XS — Other heatstroke and sunstroke, sequela, T67.1XXS — Heat syncope, sequela, T67.2XXS — Heat cramp, sequela, T67.3XXS — Heat exhaustion, anhydrotic, sequela, T67.4XXS — Heat exhaustion due to salt depletion, sequela, T67.5XXS — Heat exhaustion, unspecified, sequela, +178 more

Contextual Map

Every relationship of T34.90XS 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]
  • T33-T34 — Frostbite [Hierarchy]

Clinical classification (CCSR)

  • INJ074 — Effect of other external causes, sequela [CCSR]

Potential MS-DRG

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

MDC crossing · procedures (32029)

  • MDC 21 — Injuries, Poisonings and Toxic Effects of Drugs [MDC crossing]: “Injuries, Poisonings and Toxic Effects of Drugs — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”
  • 0016070 — Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Nasopharynx with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016071 — Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Mastoid Sinus with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016072 — Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Atrium with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016073 — Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Blood Vessel with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • 0016074 — Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach [Same-MDC procedure]: “Bypass Cerebral Ventricle to Pleural Cavity with Autologous Tissue Substitute, Open Approach — grouped in MDC 21, the procedure side of this code's crossing.” · check together
  • and 32024 more

Nearest codes (40)

  • T34 — Frostbite with tissue necrosis [Sibling]
  • T34.812D — Frostbite with tissue necrosis of left ankle, subsequent encounter [Sibling]
  • T34.812S — Frostbite with tissue necrosis of left ankle, sequela [Sibling]
  • T34.819 — Frostbite with tissue necrosis of unspecified ankle [Sibling]
  • T34.819A — Frostbite with tissue necrosis of unspecified ankle, initial encounter [Sibling]
  • T34.819D — Frostbite with tissue necrosis of unspecified ankle, subsequent encounter [Sibling]
  • T34.819S — Frostbite with tissue necrosis of unspecified ankle, sequela [Sibling]
  • T34.82 — Frostbite with tissue necrosis of foot [Sibling]
  • and 32 more

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T34.90XS 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 T34.90XS in its code family, with their registry titles.

  • T34.839A — Frostbite with tissue necrosis of unspecified toe(s), initial encounter
  • T34.839D — Frostbite with tissue necrosis of unspecified toe(s), subsequent encounter
  • T34.839S — Frostbite with tissue necrosis of unspecified toe(s), sequela
  • T34.9 — Frostbite with tissue necrosis of other and unspecified sites
  • T34.90 — Frostbite with tissue necrosis of unspecified sites
  • T34.90XA — Frostbite with tissue necrosis of unspecified sites, initial encounter
  • T34.90XD — Frostbite with tissue necrosis of unspecified sites, subsequent encounter
  • T34.99 — Frostbite with tissue necrosis of other sites
  • T34.99XA — Frostbite with tissue necrosis of other sites, initial encounter
  • T34.99XD — Frostbite with tissue necrosis of other sites, subsequent encounter

View all codes in the T34 family