Is ICD-10-CM code E51 billable?

No, E51 (Thiamine deficiency) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code E51 belong to?

E51 belongs to Chapter 4 of the ICD-10-CM tabular list: E00–E89 (Endocrine, Nutritional and Metabolic Diseases).

E51Non-billable

Thiamine deficiency

Endocrine, Nutritional and Metabolic Diseases·Other nutritional deficiencies (E50-E64)·category·FY 2026

Use a more specific code (3 billable, 1 non-billable)

E51.1Beriberihas subcodes E51.2Wernicke's encephalopathy E51.8Other manifestations of thiamine deficiency E51.9Thiamine deficiency, unspecified

CH4 Parent Instructions

Excludes1(Not coded here. Use a different code.)

transitory endocrine and metabolic disorders specific to newborn (P70-P74)

E50-E64 Parent Instructions

Excludes2(Not included here. Code separately if applicable.)

nutritional anemias (D50-D53)

Instructional Notes

Excludes1(Not coded here. Use a different code.)

sequelae of thiamine deficiency (E64.8)

Clinical Hierarchy

BillableHas subcodes

CH4Endocrine, nutritional and metabolic diseases (E00-E89)

E50-E64Other nutritional deficiencies (E50-E64)

E51Thiamine deficiencyNot billable

E51.1BeriberiSubcodes

E51.2Wernicke's encephalopathyBillable

E51.8Other manifestations of thiamine deficiencyBillable

E51.9Thiamine deficiency, unspecifiedBillable

MS-DRG Classification

2026

No direct MS-DRG triggers identified.