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T34.70XA vs T34.70XD

T34.70XA (Frostbite with tissue necrosis of unspecified knee and lower leg, initial encounter) compared with T34.70XD (Frostbite with tissue necrosis of unspecified knee and lower leg, subsequent encounter), from the official CMS tabular data. T34.70XA and T34.70XD code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

T34.70XA
Initial encounter
Frostbite with tissue necrosis of unspecified knee and lower leg, initial encounter
↔
T34.70XD
Subsequent encounter
Frostbite with tissue necrosis of unspecified knee and lower leg, subsequent encounter

Same underlying diagnosis, different encounter phase.

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

Can these codes be reported together?

Same injury, other encounter phase. T34.70XA and T34.70XD 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.

Side by side

T34.70XAFrostbite with tissue necrosis of unspecified knee and lower leg, initial encounterT34.70XDFrostbite with tissue necrosis of unspecified knee and lower leg, 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)
DefinitionFrostbite with tissue necrosis of unspecified knee and lower leg, initial encounter is a billable ICD-10-CM diagnosis code (T34.70A).Frostbite with tissue necrosis of unspecified knee and lower leg, subsequent encounter is a billable ICD-10-CM diagnosis code (T34.70D).
7th characterThe appropriate 7th character is to be added to each code from category T34The appropriate 7th character is to be added to each code from category T34
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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources