Question 1

What is ICD-10 code E35?

Accepted Answer

E35 is the ICD-10-CM diagnosis code for disorders of endocrine glands in diseases classified elsewhere. Endocrine gland disorders that occur as a result of another disease classified elsewhere in the ICD-10 system. E35 sits in the ICD-10-CM chapter for endocrine, nutritional and metabolic diseases (e00-e89), within the section covering disorders of other endocrine glands (e20-e35).

E35 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 code requires a secondary diagnosis code to identify the underlying disease causing the endocrine disorder.

Question 2

Is E35 an HCC code?

Accepted Answer

No. E35 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 E35 billable?

Accepted Answer

Yes. E35 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. E35 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 E35?

Accepted Answer

E35 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 E35 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 E35?

Accepted Answer

This code requires a secondary diagnosis code to identify the underlying disease causing the endocrine disorder Use this code when the endocrine dysfunction is a manifestation of another condition rather than a primary endocrine disease

E35

Is E35 an HCC code?

What This Code Means

Coding Tips

Excludes 1 — Do NOT code together

Use Additional Code

Code First

Code Hierarchy

Open E35 in the Interactive Encoder