S98.022A ICD-10-CM Code: Partial traumatic amputation of left foot at ankle level, initial encounter
S98.022A maps to CMS-HCC V28 405 (RAF 0.598). Documentation must support MEAT. MEAT criteria · RAF calculator · free HCC 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)
S98.022A
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePartial traumatic amputation of left foot at ankle level, initial encounter
Partial traumatic amputation of left foot at ankle level, initial encounter
CMS-HCC V28
MappedHCC 405
RAF 0.598
CMS-HCC V24
MappedHCC 173
RAF 0.208
ACA/HHS
MappedHCC 234
Varies by metal level
ESRD/PACE
MappedHCC 173
RAF 0.050
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for S98.022A in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for S98.022A in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for S98.022A in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for S98.022A in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for S98.022A in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for S98.022A in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for S98.022A 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 S98.022A an HCC code?
Yes. S98.022A (Partial traumatic amputation of left foot at ankle level, initial encounter) maps to Traumatic Amputations and Complications under the CMS-HCC V28 risk adjustment model (and Traumatic Amputations and Complications under V24), with a community non-dual aged RAF of 0.598. It is billable for payment year 2026.
Coder answer: S98.022A 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
- S98.022A
- Description
- Partial traumatic amputation of left foot at ankle level, initial encounter
- HCC (V28)
- HCC 405 — Traumatic Amputations and Complications
- RAF
- 0.598
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
Each model's RAF is its CMS base weight for that model's standard population, so 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 segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
Work S98.022A in the Code Book — tabular path, V28 RAF, and MEAT checklist →
MEAT Criteria for S98.022A
For S98.022A 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 S98.022A during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
S98.022A is the ICD-10-CM diagnosis code for partial traumatic amputation of left foot at ankle level, initial encounter. S98.022A 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, S98.022A maps to Traumatic Amputations and Complications (HCC 405) with a community, non-dual, aged base RAF weight of 0.598. Under the older V24 model, S98.022A mapped to the same category but with a base RAF weight of 0.208, V28 recalibrated weights across the entire model. 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.
Coders should report S98.022A only when the provider documentation supports the specific condition described, since more specific codes within the same hierarchy can capture additional clinical detail and may carry a higher RAF weight. Because S98.022A maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, and MEAT documentation criteria for S98.022A sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.