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S21.332D vs T33

S21.332D (Puncture wound without foreign body of left front wall of thorax with penetration into thoracic cavity, subsequent encounter) compared with T33 (Superficial frostbite), from the official CMS tabular data.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 28, 2026 · All releases and sources

Summary

These codes can be reported together when both conditions are documented, because S21.332D lists T33 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

The conditions named and billing status.S21.332D is “Puncture wound without foreign body of left front wall of thorax with penetration into thoracic cavity, subsequent encounter”; T33 is “Superficial frostbite”. T33 is a non-billable header; S21.332D is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.S21.332D lists T33 under Excludes2: “frostbite (T33-T34)”. Excludes2 marks distinct conditions that may both be reported when both are documented.

Official ruleGuide: Excludes1 vs Excludes2

Is there an Excludes1 relationship?

None.Neither entry carries an Excludes1 note that names the other code. S21.332D carries 1 Excludes1 note covering other codes; the side-by-side table quotes them.

Official rule

Is there an Excludes2 relationship?

Yes.S21.332D’s tabular entry: “frostbite (T33-T34)”. The note covers T33.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

Not comparable.The codes sit in different categories; specificity is only comparable within one category.

Is one a parent or header code?

One is a header.T33 is a non-billable header, but S21.332D is not one of its subdivisions.

Registry fact

Are there sequencing instructions?

None.Neither entry carries a Code First or Use Additional Code note that names the other.

Official rule

Are there other coding relationships?

None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.

MedCoder-derived

Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels

Can these codes be reported together?

Informational

Excludes2 relationship

S21.332D
Puncture wound without foreign body of left front wall of thorax with penetration into thoracic cavity, subsequent encounter
↔
T33
Superficial frostbite

What we found

Yes, when both are documented.S21.332D carries an Excludes2 note covering T33: “frostbite (T33-T34)”

Excludes2 marks distinct conditions — both may be reported when both are documented.

What to review

Report both only when the documentation supports both conditions; otherwise report the one documented.

Guide: Excludes1 vs Excludes2Check these on a claim

Why it matters

An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.

Source / rule

CMS ICD-10-CM tabular instructional notes

Official guidance behind these answers

  • Section I.A.12.b — Excludes2 · applies to: Excludes2

    A type 2 Excludes note represents “Not included here.” An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.

    ICD-10-CM Official Guidelines FY2027

Quoted from the ICD-10-CM Official Guidelines for Coding and Reporting in effect for the release shown. The tabular notes above are the code-level instruction; these sections are the convention that says how such a note is applied. Source document (CMS PDF) · Release and checksum

Side by side

Similar descriptions do not make codes interchangeable. The documentation and the official instructions decide which code applies.

Official descriptionDiffers
S21.332D

Puncture wound without foreign body of left front wall of thorax with penetration into thoracic cavity, subsequent encounter

T33

Superficial frostbite

StatusDiffers
S21.332D
Billable
T33
Non-billable header

A header is not reported on a claim; a code beneath it is.

Report instead: T33.011A, T33.011D, T33.011S, T33.012A, T33.012D

Excludes1Differs
S21.332D
  • traumatic amputation (partial) of thorax (S28.1)
T33

None at this code

Excludes2Differs
S21.332D
  • burns and corrosions (T20-T32)
  • effects of foreign body in bronchus (T17.5)
  • effects of foreign body in esophagus (T18.1)
  • effects of foreign body in lung (T17.8)
  • effects of foreign body in trachea (T17.4)
  • frostbite (T33-T34)
  • injuries of axilla
  • injuries of clavicle
  • injuries of scapular region
  • injuries of shoulder
  • insect bite or sting, venomous (T63.4)
T33
  • hypothermia and other effects of reduced temperature (T68, T69.-)
Code alsoDiffers
S21.332D
  • any associated injury, such as:
  • injury of heart (S26.-)
  • injury of intrathoracic organs (S27.-)
  • rib fracture (S22.3-, S22.4-)
  • spinal cord injury (S24.0-, S24.1-)
  • traumatic hemopneumothorax (S27.3)
  • traumatic hemothorax (S27.1)
  • traumatic pneumothorax (S27.0)
  • wound infection
T33

None at this code

CategoryDiffers
S21.332D

S21 Open wound of thorax

T33

Is itself a category

ChapterSame for both

S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)

IncludesDiffers
S21.332D
  • injuries of breast
  • injuries of chest (wall)
  • injuries of interscapular area
T33
  • frostbite with partial thickness skin loss
7th characterDiffers
S21.332D
  • The appropriate 7th character is to be added to each code from category S21
T33
  • The appropriate 7th character is to be added to each code from category T33

No Code first and Use additional code note at either code.

Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on. In a row that differs, notes every code shares are dimmed.

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Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources