2027 ICD-10-CM Diagnosis Code E55.0Rickets, active
ICD-10-CM Codes›E00–E89›E50-E64›E55
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Chronic Condition
E55.0 is a billable ICD-10-CM diagnosis code for rickets, active. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 553 through 554. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 34 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nutritional deficiencies.
E55.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 87 for payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
E55.0 does not risk-adjust for Medicare Advantage under the CMS-HCC V28 model, but it maps to payment categories in the other CMS models shown below.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormal curvature of spine due to osteomalacia
- Acquired deformity of chest wall
- Active rickets
- Biochemical rickets
- Calcipenic type rickets
- Endocrine myopathy
- Hypocalcemic rickets
- Hypophosphatasia rickets
- Metabolic bone disease of prematurity
- Myopathy in osteomalacia
- Neonatal rickets
- Osteomalacia
- Osteomalacia due to vitamin D deficiency
- Rachitic dwarf
- Rachitic rosary
- Rickets
- Rickets due to prematurity
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to E55.0: 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.
- Infantile osteomalacia
- Juvenile osteomalacia
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 E55.0, its category, or a range that includes it.
Excludes1 7
These codes carry an Excludes1 note naming E55.0: they are not reported together with it, unless the two conditions are unrelated.
- E21 Hyperparathyroidism and other disorders of parathyroid glandinfantile and juvenile osteomalacia (E55.0)
- E83.31 Familial hypophosphatemiavitamin D-deficiency rickets (E55.0)
- M83 Adult osteomalaciainfantile and juvenile osteomalacia (E55.0)
- M83 Adult osteomalaciarickets (active) (E55.0)
- E83 Disorders of mineral metabolismvitamin D deficiency (E55.-) names E55.-, which includes this code
- T45.2X6 Underdosing of vitamins
- Z72.4 Inappropriate diet and eating habits
Code First 2
These codes say to code first a condition named in the note, and E55.0 is one of the conditions named.
Notes 1
These notes mention E55.0.
- 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
with rickets E55.0
Disease, diseased See Also: Syndrome;
English (rickets) E55.0
Morbus See Also: Disease;
angelicus, anglorum E55.0
Rickets (active) (acute) (adolescent) (chest wall) (congenital) (current) (infantile) (intestinal) E55.0
Rosary, rachitic E55.0
rickets E55.0
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Rickets
disorders caused by interruption of bone mineralization manifesting as osteomalacia in adults and characteristic deformities in infancy and childhood due to disturbances in normal bone formation. the mineralization process may be interrupted by disruption of vitamin d; phosphorus; or calcium homeostasis, resulting from dietary deficiencies, or acquired, or inherited metabolic, or hormonal disturbances.
Patient EducationClinical
Malnutrition
Malnutrition means that your body isn't getting enough calories or the right balance of nutrients to stay healthy. This can happen if you don't get enough protein, carbohydrates, and fats, eat too much unhealthy food, or don't get the vitamins and minerals your body needs.
The full article covers:
- What is malnutrition?
- What are the types of malnutrition?
- What causes malnutrition?
- Who is at risk for developing malnutrition?
- What are the symptoms of malnutrition?
- How is malnutrition diagnosed?
- What are the treatments for malnutrition?
- Can malnutrition be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert E55.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About E55.0Overview
What is the ICD-10 code for rickets, active?
The ICD-10-CM code for rickets, active is E55.0 (sometimes written as E550). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is E55.0 (Vitamin D deficiency) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report rickets, active on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does E55.0 group to?
When rickets, active is the principal diagnosis on an inpatient stay, it groups to MS-DRG 554, 553, with relative weights from 0.8328 to 1.2492 depending on complications. Higher weights mean higher Medicare reimbursement.
Is E55.0 a CC or MCC?
CMS lists E55.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 34 closely related codes in its exclusion list.
Can E55.0 be reported with K90.0?
Not as a rule. The Excludes1 note on E55.0 lists "celiac rickets (K90.0)". 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).
Does E55.0 risk-adjust for Medicare Advantage payment?
Not for Medicare Advantage: E55.0 maps to no category in the CMS-HCC V28 model. It still risk-adjusts in the RxHCC Part D (V08) category 87 (Osteoporosis, Vertebral and Pathological Fractures).
