Question 1

What is ICD-10 code M23.300?

Accepted Answer

M23.300 is the ICD-10-CM diagnosis code for other meniscus derangements, unspecified lateral meniscus, right knee. Various types of damage or displacement of the outer cartilage pad (meniscus) in the right knee. M23.300 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other joint disorders (m20-m25).

M23.300 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

This is a non-specific code for lateral meniscus derangements; use only when the exact type of derangement cannot be determined.

Question 2

Is M23.300 an HCC code?

Accepted Answer

No. M23.300 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is M23.300 billable?

Accepted Answer

Yes. M23.300 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. M23.300 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for M23.300?

Accepted Answer

M23.300 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards M23.300 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting M23.300?

Accepted Answer

This is a non-specific code for lateral meniscus derangements; use only when the exact type of derangement cannot be determined Review documentation to see if a more specific M23.2x code would be appropriate

M23.300

Is M23.300 an HCC code?

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