S88.029A Partial traumatic amputation at knee level, unspecified lower leg, initial encounter

Billable ICD-10-CM code, FY2026.

Built from S88.029 with 7th character A (initial encounter).

Applies from S88 Traumatic amputation of lower leg

Applicable to

• An amputation not identified as partial or complete should be coded to complete

Excludes1 (never code together)

• traumatic amputation of ankle and foot (S98.-)

7th character note

• The appropriate 7th character is to be added to each code from category S88

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Risk adjustment (HCC)

• CMS-HCC V28: HCC 405 — Traumatic Amputations and Complications
• CMS-HCC V22: HCC 173 — Traumatic Amputations and Complications
• ESRD V24: HCC 173

Medicare Code Edits (MCE v43.1 (April 2026))

• Unspecified code (laterality): Unspecified codes for which a more specific code identifying laterality (right, left, bilateral) exists within the same code family.

Code annotations containing back-references to S88.029A

Back-references to S88.0

• Type 1 Excludes: S78 Traumatic amputation of hip and thigh ("traumatic amputation of knee (S88.0-)")
• Type 1 Excludes: S78.1 Traumatic amputation at level between hip and knee ("traumatic amputation of knee (S88.0-)")

Back-references to S88

• Type 2 Excludes: M23 Internal derangement of knee ("current injury - see injury of knee and lower leg (S80-S89)")
• Type 1 Excludes: S81 Open wound of knee and lower leg ("traumatic amputation of lower leg (S88.-)")
• Type 1 Excludes: S82 Fracture of lower leg, including ankle ("traumatic amputation of lower leg (S88.-)")

Nearby codes

• S88.022 Partial traumatic amputation at knee level, left lower leg
• S88.022A Partial traumatic amputation at knee level, left lower leg, initial encounter
• S88.022D Partial traumatic amputation at knee level, left lower leg, subsequent encounter
• S88.022S Partial traumatic amputation at knee level, left lower leg, sequela
• S88.029 Partial traumatic amputation at knee level, unspecified lower leg
• S88.029A Partial traumatic amputation at knee level, unspecified lower leg, initial encounter (this code)
• S88.029D Partial traumatic amputation at knee level, unspecified lower leg, subsequent encounter
• S88.029S Partial traumatic amputation at knee level, unspecified lower leg, sequela
• S88.1 Traumatic amputation at level between knee and ankle
• S88.11 Complete traumatic amputation at level between knee and ankle
• S88.111 Complete traumatic amputation at level between knee and ankle, right lower leg