2027 ICD-10-CM Diagnosis Code E55.9Vitamin D deficiency, unspecified
ICD-10-CM Codes›E00–E89›E50-E64›E55
- Billable — Valid for Submission
- Chronic Condition
E55.9 is a billable ICD-10-CM diagnosis code for vitamin D deficiency, unspecified. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 640 through 641. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional deficiencies.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Chronic disease-related malnutrition
- Deficiency of vitamin D2
- Deficiency of vitamin D3
- Disorder of vitamin D
- Disorder of vitamin D2
- Disorder of vitamin D3
- Hyperparathyroidism due to vitamin D deficiency
- Inadequate intake of vitamin D and/or vitamin D derivative
- Secondary hyperparathyroidism
- Secondary hyperparathyroidism of nonrenal origin
- Vitamin D below reference range
- Vitamin D deficiency
- Vitamin D deficiency due to chronic kidney disease
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E55.9: its own notes plus those printed at E55, block E50-E64, and Chapter 4. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Avitaminosis D
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- All neoplasms, whether functionally active or not, are classified in Chapter 2. Appropriate codes in this chapter (i.e. E05.8, E07.0, E16-E31, E34.-) may be used as additional codes to indicate either functional activity by neoplasms and ectopic endocrine tissue or hyperfunction and hypofunction of endocrine glands associated with neoplasms and other conditions classified elsewhere.
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name E55.9, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming E55.9: they are not reported together with it, unless the two conditions are unrelated.
Code First 1
These codes say to code first a condition named in the note, and E55.9 is one of the conditions named.
- G63 Polyneuropathy in diseases classified elsewhere
Notes 1
These notes mention E55.9.
- E64 Sequelae of malnutrition and other nutritional deficienciesThis category is to be used to indicate conditions in categories E43, E44, E46, E50-E63 as the cause of sequelae, which are themselves classified elsewhere. The 'sequelae' include conditions specified as such; they also include the late effects of diseases classifiable to the above categories if the disease itself is no longer present names E50-E63, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Avitaminosis (multiple) See Also: Deficiency, vitamin; E56.9
D E55.9
calciferol E55.9
ergosterol E55.9
D E55.9
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Vitamin D Deficiency
a nutritional condition produced by a deficiency of vitamin d in the diet, insufficient production of vitamin d in the skin, inadequate absorption of vitamin d from the diet, or abnormal conversion of vitamin d to its bioactive metabolites. it is manifested clinically as rickets in children and osteomalacia in adults. (from cecil textbook of medicine, 19th ed, p1406)
Patient EducationClinical
Vitamin D Deficiency
Vitamin D deficiency means that your body is not getting enough vitamin D to stay healthy.
The full article covers:
- What is vitamin D deficiency?
- Why do I need vitamin D and how do I get it?
- How much vitamin D do I need?
- What causes vitamin D deficiency?
- Who is at risk of vitamin D deficiency?
- What problems does vitamin D deficiency cause?
- How can I get more vitamin D?
- Can too much vitamin D be harmful?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E55.9 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E55.9Overview
What is the ICD-10 code for vitamin D deficiency, unspecified?
The ICD-10-CM code for vitamin D deficiency, unspecified is E55.9 (sometimes written as E559). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E55.9 (Vitamin D deficiency) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report vitamin D deficiency, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E55.9 group to?
When vitamin D deficiency, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 641, 640, with relative weights from 0.7864 to 1.3392 depending on complications. Higher weights mean higher Medicare reimbursement.
Can E55.9 be reported with a code from M83?
Not as a rule. The Excludes1 note at E55, which applies to E55.9, lists "adult osteomalacia (M83.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
What is the ICD-9 equivalent of E55.9?
Under the General Equivalence Mappings, vitamin D deficiency, unspecified converts to ICD-9-CM 268.9 (vitamin D deficiency NOS). The mapping is a direct match.
