S98.921S ICD-10-CM Code: Partial traumatic amputation of right foot, level unspecified, sequela
S98.921S is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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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)
S98.921S
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidancePartial traumatic amputation of right foot, level unspecified, sequela
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
MappedHCC 189
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- An amputation not identified as partial or complete should be coded to completeInherited from S98
Excludes 2
Official- birth trauma (P10-P15)Inherited from S00-T88, S90-S99
- obstetric trauma (O70-O71)Inherited from S00-T88, S90-S99
- burns and corrosions (T20-T32)Inherited from S00-T88, S90-S99
- fracture of ankle and malleolus (S82.-)Inherited from S00-T88, S90-S99
- frostbite (T33-T34)Inherited from S00-T88, S90-S99
- insect bite or sting, venomous (T63.4)Inherited from S00-T88, S90-S99
Related Codes
Includes
OfficialNo Includes notes are included in this display for S98.921S. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for S98.921S. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for S98.921S. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify any retained foreign body, if applicable (Z18.-)Inherited from S00-T88
Code Also
OfficialNo Code Also instructions are included in this display for S98.921S. Check the code and parent instructions in the Code Book.
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 S98.921S an HCC code?
S98.921S has no mapping under the current CMS-HCC V28 community payment model. S98.921S has a separate mapping under the CMS-HCC ESRD model (HCC 189 (Amputation Status/Lower Limb/Amputation Complications)); the applicable result needs member context.
- Code
- S98.921S
- Description
- Partial traumatic amputation of right foot, level unspecified, sequela
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
HCC Category Mapping
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 S98.921S in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for S98.921S
For S98.921S, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.
- 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
Coder workflow notes
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What This Code Means
S98.921S is the ICD-10-CM diagnosis code for partial traumatic amputation of right foot, level unspecified, sequela. S98.921S 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).
S98.921S has no mapping under the current CMS-HCC V28 community payment model. S98.921S has a separate mapping under the CMS-HCC ESRD model (HCC 189 (Amputation Status/Lower Limb/Amputation Complications)); the applicable result needs member context. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
S98.921S is a billable ICD-10-CM code, but no current CMS-HCC V28 community payment mapping is shown. It does map under the CMS-HCC ESRD model, and that result depends on member context rather than on the V28 community model. Do not assign risk adjustment value from this page when no source-backed mapping is shown. Coders should check the current model files and select only the specificity supported by the provider documentation.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for S98.921S sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.