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T34.99XD ICD-10-CM Code: Frostbite with tissue necrosis of other sites, 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

Frostbite with tissue necrosis of other sites, subsequent encounter is a billable ICD-10-CM diagnosis code (T34.99D).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T34.99XD in the official ICD-10-CM tabular list.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Frostbite with tissue necrosis of leg NOS
  • Frostbite with tissue necrosis of trunk 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 T34.99XD 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 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.

Clinical classification (AHRQ CCSR):INJ058 — Effect of other external causes, 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.

Related Codes

Same injury, other encounter phase

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

T34.99XA — Frostbite with tissue necrosis of other sites, initial encounter, T34.99XS — Frostbite with tissue necrosis of other sites, sequela

Same clinical category (CCSR)

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

T34.829D — Frostbite with tissue necrosis of unspecified foot, subsequent encounter, T34.831D — Frostbite with tissue necrosis of right toe(s), subsequent encounter, T34.832D — Frostbite with tissue necrosis of left toe(s), subsequent encounter, T34.839D — Frostbite with tissue necrosis of unspecified toe(s), subsequent encounter, T34.90XD — Frostbite with tissue necrosis of unspecified sites, subsequent encounter, T66.XXXD — Radiation sickness, unspecified, subsequent encounter, T67.01XD — Heatstroke and sunstroke, subsequent encounter, T67.02XD — Exertional heatstroke, subsequent encounter, T67.09XD — Other heatstroke and sunstroke, subsequent encounter, T67.1XXD — Heat syncope, subsequent encounter, +159 more

Contextual Map

Every relationship of T34.99XD 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)

  • INJ058 — Effect of other external causes, subsequent encounter [CCSR]

Potential MS-DRG

  • DRG 949 — AFTERCARE WITH CC/MCC [MS-DRG]: “AFTERCARE WITH CC/MCC (MDC 23)”
  • DRG 950 — AFTERCARE WITHOUT CC/MCC [MS-DRG]: “AFTERCARE WITHOUT CC/MCC (MDC 23)”

MDC crossing · procedures (1235)

  • MDC 23 — Factors Influencing Health Status and Other Contacts with Health Services [MDC crossing]: “Factors Influencing Health Status and Other Contacts with Health Services — 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.”
  • F003GKZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Audiovisual Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Audiovisual Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GMZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Augmentative / Alternative Communication Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Augmentative / Alternative Communication Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GPZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Computer [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Computer — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GYZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Other Equipment [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body using Other Equipment — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • F003GZZ — Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body [Same-MDC procedure]: “Communicative/Cognitive Integration Skills Assessment of Neurological System - Whole Body — grouped in MDC 23, the procedure side of this code's crossing.” · check together
  • and 1230 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 T34.99XD 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 T34.99XD 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
  • T34.90XS — Frostbite with tissue necrosis of unspecified sites, sequela
  • T34.99 — Frostbite with tissue necrosis of other sites
  • T34.99XA — Frostbite with tissue necrosis of other sites, initial encounter

View all codes in the T34 family