ICD-10 Z44.121
Billable / Specific HCC v28: 189Encounter for fitting and adjustment of partial artificial right leg
About ICD-10-CM Z44.121
ICD-10-CM code Z44.121 represents Encounter for fitting and adjustment of partial artificial right leg. This is a billable/specific code in the Factors Influencing Health Status chapter (block Z44). The 2026 edition of ICD-10-CM Z44.121 became effective on October 1, 2025.
Coding Tips for Z44.121
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Z44.121 is a CMS-HCC v28 risk-adjustment code (category 189). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for Z44.121
Local Coverage Determinations (LCDs) from CMS MACs that list Z44.121 as a covered diagnosis.
Showing top 10 of 248 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Z44.121.
4 Medicare
CPT Codes Commonly Billed with Z44.121
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert Z44.121 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| Z44.121 | V521 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To Z44.121
Other codes in section Z40-Z53 (Encounters for other specific health care).
ICD-10 Z44.121, Billing FAQ
Is ICD-10 code Z44.121 billable? +
Yes, Z44.121 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does Z44.121 affect Medicare Advantage HCC risk adjustment? +
Yes. Z44.121 maps to CMS-HCC v28 category 189. Capture this diagnosis annually for accurate Medicare Advantage risk score.
What ICD-9 codes does Z44.121 map to? +
Per CMS GEMs, Z44.121 maps to ICD-9 codes: V521. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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