2026 ICD-10-CM Diagnosis Code R63.0Anorexia

ICD-10-CM Codes›R00–R99›R50-R69›R63

ICD-10-CM R63.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R63.0 is a billable ICD-10-CM diagnosis code for anorexia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 640 through 641. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as café au lait spots. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other general signs and symptoms.

Code Identity

ICD-10-CM Code
R63.0
Billable Status
Yes — Valid for Submission
Code Describes
Anorexia
Short Description
Anorexia
Same as the full description in the CMS dataset.
Parent Code
R63
Symptoms and signs concerning food and fluid intake

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR50-R69General symptoms and signs
CategoryR63Symptoms and signs concerning food and fluid intake
This CodeR63.0Anorexia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Café au lait spots
  • Decrease in appetite
  • Facial dysmorphism, anorexia, cachexia, eye and skin anomalies syndrome
  • Finding of quantity of appetite
  • Loss of appetite
  • No interest in food
  • RAVINE syndrome

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Loss of appetite

Type 1 Excludes

  • anorexia nervosa F50.0
  • loss of appetite of nonorganic origin F50.89

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anorexia
    • Appetite
      • lack or loss
    • Dysorexia
    • Lack of
      • appetite (see Anorexia)
    • Loss(of)
      • appetite (see Anorexia)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM016
Other general signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Anorexia

    the lack or loss of appetite accompanied by an aversion to food and the inability to eat. it is the defining characteristic of the disorder anorexia nervosa.

  • Anorexia Nervosa

    an eating disorder that is characterized by the lack or loss of appetite, known as anorexia. other features include excess fear of becoming overweight; body image disturbance; significant weight loss; refusal to maintain minimal normal weight; and amenorrhea. this disorder occurs most frequently in adolescent females. (apa, thesaurus of psychological index terms, 1994)

Patient EducationClinical

Eating Disorders

Eating disorders are serious mental health disorders. They involve severe problems with your thoughts about food and your eating behaviors. You may eat much less or much more than you need.

The full article covers:

  • What are eating disorders?
  • What are the types of eating disorders?
  • What causes eating disorders?
  • Who is at risk for eating disorders?
  • What are the symptoms of eating disorders?
  • How is eating disorders diagnosed?
  • What are the treatments for eating disorders?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert R63.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
783.0 Anorexia
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About R63.0Overview

Is R63.0 (Symptoms and signs concerning food and fluid intake) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report anorexia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R63.0 group to?

When anorexia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 640, 641, with relative weights from 0.7782 to 1.3356 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R63.0 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the anorexia is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R63.0?

Under the General Equivalence Mappings, anorexia converts to ICD-9-CM 783.0 (anorexia). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.