Skip to main content
ICD-10/T33.42XD

T33.42XD ICD-10-CM Code: Superficial frostbite of left arm, 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 left arm, subsequent encounter is a billable ICD-10-CM diagnosis code (T33.42D).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T33.42XD 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

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.

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 T33.42XD 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 T33.42XD 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 T33.42XD in its code family, with their registry titles.

  • T33.41XA — Superficial frostbite of right arm, initial encounter
  • T33.41XD — Superficial frostbite of right arm, subsequent encounter
  • T33.41XS — Superficial frostbite of right arm, sequela
  • T33.42 — Superficial frostbite of left arm
  • T33.42XA — Superficial frostbite of left arm, initial encounter
  • T33.42XS — Superficial frostbite of left arm, sequela
  • T33.5 — Superficial frostbite of wrist, hand, and fingers
  • T33.51 — Superficial frostbite of wrist
  • T33.511 — Superficial frostbite of right wrist
  • T33.511A — Superficial frostbite of right wrist, initial encounter

View all codes in the T33 family