Question 1

What is ICD-10 code E58?

Accepted Answer

E58 is the ICD-10-CM diagnosis code for dietary calcium deficiency. Insufficient calcium intake from diet, which can lead to weak bones and increased risk of fractures. E58 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering other nutritional deficiencies (e50-e64).

E58 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.

Distinguish between dietary calcium deficiency and hypocalcemia; this code is specifically for nutritional deficiency.

Question 2

Is E58 an HCC code?

Accepted Answer

No. E58 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 E58 billable?

Accepted Answer

Yes. E58 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. E58 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 E58?

Accepted Answer

E58 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 community model rewards E58 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's V28/V24 community RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a community payment HCC.

Question 5

What should coders know when reporting E58?

Accepted Answer

Distinguish between dietary calcium deficiency and hypocalcemia; this code is specifically for nutritional deficiency Document whether deficiency is due to inadequate intake or malabsorption issues

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E58

Is E58 an HCC code?

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What This Code Means

Coding Tips

Excludes 1, Do NOT code together

Code Hierarchy

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E58 ICD-10-CM Code: Dietary calcium deficiency

HCC Buddy Code Card

E58

Is E58 an HCC code?

Get the V28 RAF + MEAT cheat sheet

What This Code Means

Coding Tips

Excludes 1, Do NOT code together

Code Hierarchy

Work E58 in HCC Buddy