Billing codes · ICD-10-CM code

E55.9 vitamin D deficiency on nutrition claims

By Javier Alvarez · Updated September 28, 2026 · 4 min read

Vitamin D deficiency is on a lot of problem lists and in a lot of dietitian notes. It's a valid, billable code. It's also one that almost never pays for a nutrition visit on its own, and the one most often coded from a lab value instead of a diagnosis.

E55.9 in the code set

Category E55, vitamin D deficiency, has two billable codes:

The category has an Excludes1 note for adult osteomalacia (M83.-), osteoporosis (M80.-) and sequelae of rickets (E64.3). Osteomalacia due to malnutrition or malabsorption has its own M83 codes, which the index reaches directly.

The E50-E64 section also has an Excludes2 for nutritional anemias (D50-D53), so a documented iron deficiency anemia can be coded next to E55.9. See D50.9 iron deficiency anemia.

Nothing in E55 changed in the FY2027 update effective October 1, 2026.

Diagnosis, not lab value

Section I.A.19 of the Official Guidelines says code assignment is based on the provider's diagnostic statement that the condition exists. A 25-hydroxyvitamin D level below a lab's reference range isn't, by itself, a diagnosis you can code.

What that means in practice:

• Provider documented "vitamin D deficiency." Code E55.9.
• Provider wrote "insufficiency" or "low vitamin D." ICD-10-CM has no separate insufficiency code. Ask the provider whether they're diagnosing deficiency. Don't pick a code for them.
• Only the lab value is in the chart. Record it in your note as an assessment finding. Your PES statement can describe the nutrition problem (for example, inadequate vitamin D intake), but E55.9 stays off the claim until the provider documents it.

Screening is a different question

A test to find vitamin D deficiency in someone without symptoms is a screening, and it's the ordering provider's claim, not yours. The USPSTF's current recommendation (April 2021) is an I statement: the evidence is insufficient to assess the benefits and harms of screening asymptomatic, community-dwelling, nonpregnant adults for vitamin D deficiency. So routine vitamin D screening is not one of the ACA's no-cost-sharing preventive services on that basis.

If your visit is about nutrition screening rather than a diagnosed deficiency, see Z13.21 vs. Z71.3.

Coverage: why E55.9 usually goes second

• Preventive nutrition benefits are built around USPSTF recommendations on cardiovascular risk, obesity and prediabetes. UnitedHealthcare's preventive MNT rows, for example, list weight, lipid, glucose and blood pressure diagnoses, not vitamin deficiencies.
• Medical benefits cover nutrition counseling for conditions where diet has a therapeutic role (Aetna CPB 0049's wording). E55.9 isn't named among the examples, and reviewers may not accept it alone. Verify before billing it as the only diagnosis.
• Medicare MNT covers diabetes and renal disease only (NCD 180.1).

The patients who see a dietitian with vitamin D deficiency usually have something else going on: celiac disease, CKD, obesity, bariatric surgery. That condition carries the claim; E55.9 adds context and supports your supplementation and diet plan.

Example claim lines (invented)

Point the procedure line at the diagnosis that establishes coverage. See K90.0 celiac disease for the GI side.

What the note should show

• The provider's vitamin D deficiency diagnosis, with its source.
• Lab values as reported and their dates, current supplements, dose and adherence as the patient reports them.
• Diet and sun-exposure assessment, and risk factors such as malabsorption or bariatric surgery.
• Your PES statement, intervention, follow-up plan, and face-to-face minutes for units. The MNT documentation guide covers the full structure.

Denials and fixes

The full set of diagnosis codes for nutrition claims is in the ICD-10 codes for dietitians reference.