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T33.522S vs T33.53

T33.522S (Superficial frostbite of left hand, sequela) compared with T33.53 (Superficial frostbite of finger(s)), 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 T33.522S lists T33.53 under Excludes2, which marks them as distinct conditions.

Official rule
What is different?

Title wording and billing status.The titles share “Superficial frostbite of”; T33.522S says “left hand, sequela” where T33.53 says “finger(s)”. T33.53 is a non-billable header; T33.522S is billable.

Registry fact

Can these codes be reported together?

Yes, when both are documented.T33.522S lists T33.53 under Excludes2: “superficial frostbite of fingers (T33.53-)”. 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.

Official rule

Is there an Excludes2 relationship?

Yes.T33.522S’s tabular entry: “superficial frostbite of fingers (T33.53-)”. The note covers T33.53.

Official ruleGuide: Excludes1 vs Excludes2

Is one more specific?

No.Neither is a subdivision of the other, and neither title is the unspecified form; they describe different conditions within category T33.

Registry fact

Is one a parent or header code?

One is a header.T33.53 is a non-billable header, but T33.522S 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

T33.522S
Superficial frostbite of left hand, sequela
↔
T33.53
Superficial frostbite of finger(s)

What we found

Yes, when both are documented.T33.522S carries an Excludes2 note covering T33.53: “superficial frostbite of fingers (T33.53-)”

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
T33.522S

Superficial frostbite of left hand, sequela

T33.53

Superficial frostbite of finger(s)

StatusDiffers
T33.522S
Billable
T33.53
Non-billable header

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

Report instead: T33.531A, T33.531D, T33.531S, T33.532A, T33.532D

Excludes2Differs
T33.522S
  • superficial frostbite of fingers (T33.53-)
  • hypothermia and other effects of reduced temperature (T68, T69.-)
T33.53
  • hypothermia and other effects of reduced temperature (T68, T69.-)
CategorySame for both

T33 Superficial frostbite

ChapterSame for both

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

IncludesSame for both
  • frostbite with partial thickness skin loss
7th characterSame for both
  • The appropriate 7th character is to be added to each code from category T33

No Excludes1, Code first, Use additional code and Code also 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