ICD-10-CM 2027
ICD-10 code for lack or loss appetite
From the official ICD-10-CM alphabetic index entry “Appetite › lack or loss”. Page updated September 29, 2026.
About coding lack or loss appetite
The ICD-10-CM code for lack or loss appetite is R63.0 (Anorexia). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on R63.0.
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.
More specific lack or loss appetite codes (official index)
Don't confuse with (Excludes1 for R63.0)
Common questions about lack or loss appetite ICD-10 codes
What is the ICD-10 code for lack or loss appetite?
- R63.0 — Anorexia. More specific codes apply when the documentation supports them: F50.89, F50.89.
What is the ICD-10 code for nonorganic origin lack or loss appetite?
- F50.89 — Other specified eating disorder.
What is the ICD-10 code for psychogenic lack or loss appetite?
- F50.89 — Other specified eating disorder.
Is R63.0 billable?
- Yes. R63.0 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R63.0 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R63.0 as a principal diagnosis.
Is R63.0 a CC or MCC?
- No. R63.0 is neither a CC nor an MCC under MS-DRG v44.0.