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S98.029A ICD-10-CM Code: Partial traumatic amputation of unspecified foot at ankle level, initial encounter

S98.029A maps to CMS-HCC V28 405. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC Buddy coding tools

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FY 2026 Apr update / Injury, poisoning and certain other consequences of external causes (S00-T88) / Injuries to the ankle and foot (S90-S99)

S98.029A

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Partial traumatic amputation of unspecified foot at ankle level, initial encounter

Partial traumatic amputation of unspecified foot at ankle level, initial encounter

CMS-HCC V28

HCC 405

Code-level coefficient reference

CMS-HCC V24

Historical

Historical

Not used for CY2026 payment

ACA/HHS

HCC 234

Code-level coefficient reference

ESRD/PACE

HCC 173

Code-level coefficient reference

RXHCC

N/A

—

Not mapped

Code Book Path

Official
S98.02Partial traumatic amputation of foot at ankle level
S98.029Partial traumatic amputation of unspecified foot at ankle level
S98.029APartial traumatic amputation of unspecified foot at ankle level, initial encounter

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for S98.029A in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for S98.029A in this effective period.

Related Child Codes

Official
S98.029DPartial traumatic amputation of unspecified foot at ankle level, subsequent encounter
S98.029SPartial traumatic amputation of unspecified foot at ankle level, sequela

Includes

Official

ICD-10-CM does not list Includes notes for S98.029A in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for S98.029A in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for S98.029A in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for S98.029A in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for S98.029A in this effective period.

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is S98.029A an HCC code?

Yes. S98.029A (Partial traumatic amputation of unspecified foot at ankle level, initial encounter) maps to HCC 405, Traumatic Amputations and Complications under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.598. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: S98.029A is billable and maps to V28 HCC 405, Traumatic Amputations and Complications. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code
S98.029A
Description
Partial traumatic amputation of unspecified foot at ankle level, initial encounter
HCC (V28)
HCC 405 — Traumatic Amputations and Complications
RAF reference coefficient
0.598
Billable
Yes
Payment year
2026

HCC Category Mapping

V28HCC 405, Traumatic Amputations and Complications
0.598
ESRDHCC 173, Traumatic Amputations and Complications
Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work S98.029A in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for S98.029A

For S98.029A to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

  • MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
  • EEvaluate: test results, medication response, or physical findings reviewed by the provider
  • AAssess: explicit mention in the assessment or plan with acknowledgment of status
  • TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed S98.029A during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

S98.029A is the ICD-10-CM diagnosis code for partial traumatic amputation of unspecified foot at ankle level, initial encounter. S98.029A sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering injuries to the ankle and foot (s90-s99).

Under the CMS-HCC V28 risk adjustment model, S98.029A maps to Traumatic Amputations and Complications (HCC 405) with a source-labeled community, non-dual, aged reference coefficient of 0.598. No V24 mapping is shown for S98.029A; use the applicable model and payment year when reviewing the V28 mapping. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Coders should report S98.029A only when the provider documentation supports the specific condition described, since more specific codes within the same hierarchy can capture additional clinical detail. Because S98.029A maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for S98.029A sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Child Codes

S98.029APartial traumatic amputation of unspecified foot at ankle level, initial encounter
HCC 405
S98.029DPartial traumatic amputation of unspecified foot at ankle level, subsequent encounter
S98.029SPartial traumatic amputation of unspecified foot at ankle level, sequela

Code Hierarchy

└S98Traumatic amputation of ankle and foot└S98.0Traumatic amputation of foot at ankle level└S98.02Partial traumatic amputation of foot at ankle level└S98.029Partial traumatic amputation of unspecified foot at ankle level└S98.029APartial traumatic amputation of unspecified foot at ankle level, initial encounter
└S98.029APartial traumatic amputation of unspecified foot at ankle level, initial encounter

Because S98.029A maps to an HCC category, the documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment.

S98.029A maps to CMS-HCC V28 category 405, Traumatic Amputations and Complications. See the ICD-10 to HCC mapping hub for how the V28 crosswalk works. The mapping identifies a payment HCC category for S98.029A. Review its source-labeled HCC coefficient above, check the RAF Calculator with complete member context for CMS-HCC V28 PY2026, and confirm the documentation the chart needs before the code is submitted. HCC Buddy shows no RAF score unless every required source and calculation check passes.

Work S98.029A in HCC Buddy

Open S98.029A in the Code Book for the full Index-to-Tabular path, MEAT checklist, and V28 HCC mapping, or in the Encoder to code from a keyword search. Pro includes 7 days to try everything, no card required.

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