R63.0Anorexia

R63.0 is the ICD-10-CM diagnosis code for Anorexia. It belongs to category R63 (symptoms and signs concerning food and fluid intake), block R50-R69 (general symptoms and signs) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R63 (symptoms and signs concerning food and fluid intake), R63.0 is specifically for Anorexia. Related codes cover Polydipsia (R63.1), Polyphagia (R63.2), feeding difficulties (R63.3), abnormal weight loss (R63.4), abnormal weight gain (R63.5), Underweight (R63.6) and other symptoms and signs concerning food and fluid intake (R63.8).

Don't report R63.0 together with the conditions in its Excludes1 note: anorexia nervosa (F50.0-) and loss of appetite of nonorganic origin (F50.89).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC, relative weight 1.3395) and DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC, relative weight 0.7865), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 783.0 (Anorexia).