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S78.929A vs S78.929D

S78.929A (Partial traumatic amputation of unspecified hip and thigh, level unspecified, initial encounter) compared with S78.929D (Partial traumatic amputation of unspecified hip and thigh, level unspecified, subsequent encounter), from the official CMS tabular data. S78.929A and S78.929D code the same injury at a different phase of treatment.

Relationship

Review

Encounter relationship

S78.929A
Initial encounter
Partial traumatic amputation of unspecified hip and thigh, level unspecified, initial encounter
↔
S78.929D
Subsequent encounter
Partial traumatic amputation of unspecified hip and thigh, level unspecified, 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. S78.929A and S78.929D 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

S78.929APartial traumatic amputation of unspecified hip and thigh, level unspecified, initial encounterS78.929DPartial traumatic amputation of unspecified hip and thigh, level unspecified, 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)
DefinitionPartial traumatic amputation of unspecified hip and thigh, level unspecified, initial encounter is a billable ICD-10-CM diagnosis code (S78.929A).Partial traumatic amputation of unspecified hip and thigh, level unspecified, subsequent encounter is a billable ICD-10-CM diagnosis code (S78.929D).
7th characterThe appropriate 7th character is to be added to each code from category S78The appropriate 7th character is to be added to each code from category S78
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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