ICD-10 M96.621
Billable / Specific HCC v28: 176 CCFracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm
About ICD-10-CM M96.621
ICD-10-CM code M96.621 represents Fracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M96). The 2026 edition of ICD-10-CM M96.621 became effective on October 1, 2025.
Coding Tips for M96.621
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
M96.621 is a CMS-HCC v28 risk-adjustment code (category 176). 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.
M96.621 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
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.
Inpatient DRG Impact, CC
codes Fracture of humerus following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for M96.621
Local Coverage Determinations (LCDs) from CMS MACs that list M96.621 as a covered diagnosis.
Showing top 10 of 150 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M96.621.
3 Medicare
CPT Codes Commonly Billed with M96.621
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 M96.621 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 |
|---|---|---|
| M96.621 | 99649 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M96.621
Other codes in section M96 (Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified).
ICD-10 M96.621, Billing FAQ
Is ICD-10 code M96.621 billable? +
Yes, M96.621 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does M96.621 affect Medicare Advantage HCC risk adjustment? +
Yes. M96.621 maps to CMS-HCC v28 category 176. Capture this diagnosis annually for accurate Medicare Advantage risk score.
Is M96.621 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does M96.621 map to? +
Per CMS GEMs, M96.621 maps to ICD-9 codes: 99649. 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 June 1, 2026.
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