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ICD-10/T33.99XD

T33.99XD ICD-10-CM Code: Superficial frostbite 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

Superficial frostbite of other sites, subsequent encounter is a billable ICD-10-CM diagnosis code (T33.99D).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T33.99XD in the official ICD-10-CM tabular list.

Includes

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

  • frostbite with partial thickness skin loss

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Superficial frostbite of leg NOS
  • Superficial frostbite of trunk NOS

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.

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 T33.99XD 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]

Referenced by Excludes1 notes

  • T07 — Unspecified multiple injuries [Excludes1](via T33.-): “frostbite (T33-T34)”

Referenced by Excludes2 notes (112)

  • I73 — Other peripheral vascular diseases [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S00 — Superficial injury of head [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S00-S09 — Injuries to the head (S00-S09) [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S01 — Open wound of head [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S02 — Fracture of skull and facial bones [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S03 — Dislocation and sprain of joints and ligaments of head [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S04 — Injury of cranial nerve [Excludes2](via T33.-): “frostbite (T33-T34)”
  • S05 — Injury of eye and orbit [Excludes2](via T33.-): “frostbite (T33-T34)”
  • and 104 more

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)”

Nearest codes (40)

  • T33 — Superficial frostbite [Sibling]
  • T33.812D — Superficial frostbite of left ankle, subsequent encounter [Sibling]
  • T33.812S — Superficial frostbite of left ankle, sequela [Sibling]
  • T33.819 — Superficial frostbite of unspecified ankle [Sibling]
  • T33.819A — Superficial frostbite of unspecified ankle, initial encounter [Sibling]
  • T33.819D — Superficial frostbite of unspecified ankle, subsequent encounter [Sibling]
  • T33.819S — Superficial frostbite of unspecified ankle, sequela [Sibling]
  • T33.82 — Superficial frostbite of foot [Sibling]
  • and 32 more

Referenced by Other Codes

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.

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 T33.99XD or its code family.

1 Excludes1 notes: T07 (via T33.-).

112 Excludes2 notes across 2 chapters: I73 (via T33.-), S00 (via T33.-), S00-S09 (via T33.-), S01 (via T33.-), S02 (via T33.-), S03 (via T33.-), S04 (via T33.-), S05 (via T33.-), S06 (via T33.-), S07 (via T33.-) and 102 more.

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T33.99XD require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T33.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T33.99XD in its code family, with their registry titles.

  • T33.839A — Superficial frostbite of unspecified toe(s), initial encounter
  • T33.839D — Superficial frostbite of unspecified toe(s), subsequent encounter
  • T33.839S — Superficial frostbite of unspecified toe(s), sequela
  • T33.9 — Superficial frostbite of other and unspecified sites
  • T33.90 — Superficial frostbite of unspecified sites
  • T33.90XA — Superficial frostbite of unspecified sites, initial encounter
  • T33.90XD — Superficial frostbite of unspecified sites, subsequent encounter
  • T33.90XS — Superficial frostbite of unspecified sites, sequela
  • T33.99 — Superficial frostbite of other sites
  • T33.99XA — Superficial frostbite of other sites, initial encounter

View all codes in the T33 family