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T33.532A vs T33.532D

T33.532A (Superficial frostbite of left finger(s), initial encounter) compared with T33.532D (Superficial frostbite of left finger(s), subsequent encounter), from the official CMS tabular data. T33.532A and T33.532D code the same injury at a different phase of treatment. MedCoder-derived

Can these codes be reported together?

Review

Encounter relationship

T33.532A
Initial encounter
Superficial frostbite of left finger(s), initial encounter
↔
T33.532D
Subsequent encounter
Superficial frostbite of left finger(s), subsequent encounter

What we found

Same injury, other encounter phase.T33.532A and T33.532D code the same injury at a different phase of treatment, set by the 7th character.

The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.

What to review

Use the 7th character that matches the encounter being coded (initial, subsequent or sequela); one encounter takes one of them.

Guide: 7th characters: initial, subsequent, sequelaCheck these on a claim

Why it matters

The 7th character records the phase of care for the encounter being coded, so a single encounter takes one of these characters, not several. Review whether both phases belong on the same episode of care.

Source / rule

ICD-10-CM Official Guidelines, Section I.C.19.a

Side by side

T33.532ASuperficial frostbite of left finger(s), initial encounterT33.532DSuperficial frostbite of left finger(s), subsequent encounter
Billing statusBillableBillable
ClassificationS00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
DefinitionSuperficial frostbite of left finger(s), initial encounter is a billable ICD-10-CM diagnosis code (T33.532A).Superficial frostbite of left finger(s), subsequent encounter is a billable ICD-10-CM diagnosis code (T33.532D).
7th characterThe appropriate 7th character is to be added to each code from category T33The appropriate 7th character is to be added to each code from category T33
Includes
frostbite with partial thickness skin loss
frostbite with partial thickness skin loss
Excludes2
hypothermia and other effects of reduced temperature (T68, T69.-)
hypothermia and other effects of reduced temperature (T68, T69.-)

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.

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Derived from the official CMS ICD-10-CM tabular data (FY2026). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources