FY2027 ICD-10-CM reference
S78.122S: Partial traumatic amputation at level between left hip and knee, sequela
By the HCC Buddy Coding Team
The official ICD-10-CM descriptor is Partial traumatic amputation at level between left hip and knee, sequela. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Billable code. Verified against the official FY2027 order file.
FY2027 Tabular instructions
Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.
Instructional note
Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
Source: S00-T88 (chapter, inherited).
Instructional note
code to identify any retained foreign body, if applicable (Z18.-)
Source: S00-T88 (chapter, inherited).
Excludes2
birth trauma (P10-P15)
Source: S00-T88 (chapter, inherited).
Excludes2
obstetric trauma (O70-O71)
Source: S00-T88 (chapter, inherited).
Instructional note
The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Source: S00-T88 (chapter, inherited).
Excludes2
burns and corrosions (T20-T32)
Source: S70-S79 (section, inherited).
Excludes2
frostbite (T33-T34)
Source: S70-S79 (section, inherited).
Excludes2
snake bite (T63.0-)
Source: S70-S79 (section, inherited).
Excludes2
venomous insect bite or sting (T63.4-)
Source: S70-S79 (section, inherited).
Instructional note
An amputation not identified as partial or complete should be coded to complete
Source: S78 (category, inherited).
Excludes1
traumatic amputation of knee (S88.0-)
Source: S78 (category, inherited).
Seventh-character instruction
The appropriate 7th character is to be added to each code from category S78
Source: S78 (category, inherited).
Instructional note
initial encounter
Source: S78 (category, inherited).
Instructional note
subsequent encounter
Source: S78 (category, inherited).
Instructional note
sequela
Source: S78 (category, inherited).
Excludes1
traumatic amputation of knee (S88.0-)
Source: S78.1 (self, inherited).
Seventh-character definitions
- A: initial encounter
- D: subsequent encounter
- S: sequela
Compare the FY2027 additions, removals and billable-status changes
What does S78.122S mean in FY2027?
The official ICD-10-CM descriptor is Partial traumatic amputation at level between left hip and knee, sequela. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.
Is S78.122S billable in FY2027?
The FY2027 order file marks S78.122S as billable. Check the complete Tabular instructions and documentation before assigning it.
Does S78.122S map to an HCC?
S78.122S has no CMS-HCC V28 category in the CMS 2027 Initial ICD-10-CM Mappings (payment year 2027, 2026 dates of service). ESRD, RxHCC, PACE and HHS-HCC mappings are still pending verification for FY2027.
Source: CMS FY2027 ICD-10-CM order file. Read the FY2027 Official Guidelines.
Review the FY2026 April edition