ICD-10 Code E50.1: Vitamin A deficiency with Bitot’s spot

Key Takeaways

ICD-10 Code E50.1 is a billable ICD-10-CM diagnosis code for Vitamin A deficiency with Bitot’s spot and conjunctival xerosis, valid for FY2026 claims.

Both Bitot’s spot and conjunctival xerosis must be clinically present to justify E50.1; conjunctival xerosis alone maps to E50.0 instead.

E50.1 sits within the E50 parent category (E50.0 to E50.9), which covers all Vitamin A deficiency manifestations from ocular to systemic.

Digital intake forms and AI-powered documentation in practice management software like Pabau help practices capture nutritional deficiency diagnoses accurately and keep them tied to the encounter record.

ICD-10 Code E50.1 is a billable, specific ICD-10-CM code for Vitamin A deficiency with Bitot’s spot and conjunctival xerosis. Both findings must be documented together, since Vitamin A deficiency with only conjunctival xerosis maps to E50.0 instead. The 2026 edition became effective October 1, 2025, under the standard annual ICD-10-CM update cycle maintained by NCHS.

This reference covers the code’s definition, billable status, clinical criteria, E50 subcategory hierarchy, includes/excludes notes, and guidance for using E50.1 in FY2026 claim submissions.

ICD-10 Code E50.1: Definition and billable status

ICD-10 Code E50.1 is a billable, claim-valid ICD-10-CM code for the 2026 fiscal year. It identifies a specific clinical presentation: Vitamin A deficiency accompanied by both Bitot’s spot and conjunctival xerosis. Because both findings must be present, this code carries diagnostic precision that payers and clinical documentation systems rely on.

The AAPC’s ICD-10-CM code reference confirms E50.1 as billable and valid for submission in the current fiscal year. Coders should not use the E50 parent code for claim submission, as it is a non-billable category header.

Clinical description: Vitamin A deficiency with Bitot’s spot and conjunctival xerosis

The two clinical findings encoded in ICD-10 Code E50.1 are distinct but related signs of hypovitaminosis A. Understanding each is essential for accurate code assignment.

What is Bitot’s spot?

Bitot’s spot is a superficial, foamy or cheesy-looking lesion on the conjunctiva, typically appearing on the temporal (outer) side of the eye. It forms when dead epithelial cells accumulate on a dry conjunctival surface. The lesion is named after French physician Pierre Bitot, who described it in the 19th century as a reliable marker of Vitamin A deficiency.

• Appears as a white or gray, triangular patch on the bulbar conjunctiva
• Associated with keratinization of conjunctival epithelial cells
• Most commonly found in children with prolonged retinol deficiency
• Not all Bitot’s spots indicate active deficiency in adults; clinical context required

What is conjunctival xerosis?

Conjunctival xerosis is the drying and thickening of the conjunctival membrane caused by inadequate Vitamin A (retinol). The normally moist, transparent conjunctiva becomes dry, opaque, and loses its normal luster. It is an early-stage manifestation of xerophthalmia, the broader term for Vitamin A-related eye disease.

Xerosis conjunctivae precedes more serious damage. If retinol deficiency is not addressed, xerophthalmia can progress from xerosis to corneal involvement and eventually irreversible blindness. Coders documenting patients with conjunctival xerosis alone (without Bitot’s spot) should consider E50.0 rather than ICD-10 Code E50.1.

E50 ICD-10 code category: Subcategory hierarchy and E50.1 placement

ICD-10 Code E50.1 belongs to the E50 category, which covers all manifestations of Vitamin A deficiency. The E50 ICD-10 parent code is non-billable, so coders must select a specific subcode. Clinicians working in IV therapy EMR software environments frequently encounter E50 subcodes when documenting deficiency states alongside infusion protocols.

E50 subcategory codes overview

The following table lists every E50 subcode with its description and billable status. Use this to identify which subcode matches a patient’s confirmed clinical presentation. Refer to the CDC/NCHS official ICD-10-CM web tool for the full tabular listing.

Night blindness cases linked to retinol deficiency map to E50.5, not ICD-10 Code E50.1. When a night blindness icd 10 code lookup is needed for a Vitamin A-deficient patient, E50.5 is the correct and specific selection if no conjunctival findings are present.

Includes and excludes notes for ICD-10 Code E50.1

The Includes/Excludes notations for the E50 category live in the ICD-10-CM Tabular List, maintained by the CDC’s National Center for Health Statistics (NCHS). These govern how E50.1 interacts with other codes and what it excludes.

Misreading these notes is one of the most common reasons ICD-10 Code E50.1 claims are questioned during audits. The same Excludes1 logic applies to other single-vitamin deficiency codes such as E54.

• Excludes1: Sequelae of vitamin A deficiency (E64.1) – code a resolved deficiency with a current residual condition to E64.1, not to an E50 subcode
• Note on E50.1 specificity: This code requires documentation of both Bitot’s spot AND conjunctival xerosis. Conjunctival xerosis alone is E50.0
• Block context: E50-E64 (Other nutritional deficiencies) does not include nutritional anemia (D50-D53), such as D51.0, or obesity and hyperalimentation (E65-E68)

Coders documenting a resolved Vitamin A deficiency with a current residual condition must assign E64.1, the sequela code, rather than an active E50 subcode. Verify the current notes in the WHO’s ICD-10 browser for international context.

How to use ICD-10 Code E50.1 for reimbursement and claim submission

Using E50.1 for reimbursement depends on accurate clinical documentation. The diagnosis must be supported by the clinician’s documented findings, not inferred from lab values alone. Pabau’s structured intake forms and EMR-linked client records keep the coded diagnosis tied to the encounter note, giving coders a clear, audit-ready documentation trail to work from before a claim goes out.

1. Confirm clinical documentation: The clinician must document both Bitot’s spot and conjunctival xerosis in the encounter note. Lab confirmation of low serum retinol supports but does not substitute for clinical findings.
2. Select the most specific code: Use E50.1 only when both findings are confirmed. If only conjunctival xerosis is noted, assign E50.0. If corneal involvement is present, consider E50.2 or E50.3.
3. Verify payer requirements: Some payers may require supporting ICD-10-CM documentation for nutritional deficiency codes. Confirm medical necessity language aligns with E50.1’s clinical criteria.
4. Sequence appropriately: When Vitamin A deficiency is the reason for the encounter, E50.1 may serve as the principal diagnosis. When it is a secondary finding (e.g., in a malnourished patient presenting for another condition), sequence it accordingly.
5. Confirm FY2026 validity: E50.1 became effective October 1, 2025 for FY2026 submissions. No structural code changes apply to E50.1 in this revision cycle.

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E50.1 vs adjacent Vitamin A deficiency codes: When to use which

The E50 category is granular by design. Coders frequently ask where ICD-10 Code E50.1 ends and adjacent codes begin. The differentiation hinges on which specific clinical findings the clinician has documented, the same discipline that applies to codes like M36.3 in other ICD-10-CM chapters.

Reviewing related nutritional therapy practice workflows can help practices build intake protocols that capture these distinctions at the point of care.

Assigning E50.9 when the clinical record contains specific findings is a documentation failure. Coders should query the clinician if the encounter note describes symptoms consistent with E50.1 but lacks explicit confirmation of Bitot’s spot.

Nutritional deficiency ICD-10 codes related to E50.1

The E50-E64 block covers all major nutritional deficiency diagnoses beyond Vitamin A. Coders encountering patients with multiple deficiencies, or those reviewing nutritional deficiency ICD-10 coding workflows, benefit from seeing how E50.1 fits within the broader range. The same specificity principle applies across ICD-10-CM more broadly, from this nutritional block to oncology codes like C54.1.

Digital intake forms that capture dietary history and supplementation status can help clinicians build the documentation trail required to assign these codes with confidence.

• E50: Vitamin A deficiency (including E50.0-E50.9 subcodes)
• E51: Thiamine deficiency (B1)
• E52: Niacin deficiency – Pellagra
• E53: Deficiency of other B group vitamins
• E54: Ascorbic acid deficiency – Scurvy
• E55: Vitamin D deficiency
• E56: Other vitamin deficiencies
• E58-E61: Mineral deficiencies (calcium, magnesium, zinc, selenium, others)
• E63: Other nutritional deficiencies
• E64: Sequelae of malnutrition and other nutritional deficiencies

For practices managing patients with chronic malnutrition or those in weight management programs, these adjacent codes often appear together. Pabau’s client record system supports multi-code documentation per encounter, which is critical when a patient presents with overlapping diagnoses, whether that means multiple nutritional deficiencies or an unrelated finding such as I76 documented in the same encounter.

How Pabau supports accurate diagnostic code documentation

Practices that regularly encounter nutritional deficiency diagnoses, including those running weight management, integrative, or IV therapy programs, need documentation systems that make ICD-10 Code E50.1 assignment straightforward, not an afterthought. Pabau’s AI-powered clinical documentation captures the clinical findings from the consultation and structures them into the patient record, reducing the risk of undercoded or missing diagnoses.

For practices in wellness and integrative medicine settings, Pabau’s EMR-linked client records keep the documented diagnosis tied to the encounter note, so coders can review the supporting clinical detail in the same workflow rather than cross-referencing a separate system.

Explore how Pabau supports practice management software workflows for practices that handle diagnostic coding alongside clinical care delivery.

Conclusion

ICD-10 Code E50.1 is a billable, claim-valid code that requires both Bitot’s spot and conjunctival xerosis to be documented in the clinical record. Getting this distinction right matters. Assigning E50.0 when both findings are present undercodes the encounter, and assigning E50.1 without documented Bitot’s spot creates an audit risk.

The E50 subcategory hierarchy gives coders the granularity to document exactly what the clinician found.

Pabau’s digital intake forms and structured clinical documentation make accurate nutritional deficiency coding part of the standard charting process. To see how Pabau handles ICD-10 code documentation for your practice, book a demo.

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