ICD-10-CM 2027
ICD-10 code for gain weight
From the official ICD-10-CM alphabetic index entry “Weight › gain (abnormal) (excessive)”. Page updated September 29, 2026.
About coding gain weight
The ICD-10-CM code for gain weight is R63.5 (Abnormal weight gain).
Within R63 (symptoms and signs concerning food and fluid intake), R63.5 is specifically for abnormal weight gain. Related codes cover Anorexia (R63.0), Polydipsia (R63.1), Polyphagia (R63.2), feeding difficulties (R63.3), abnormal weight loss (R63.4), Underweight (R63.6) and other symptoms and signs concerning food and fluid intake (R63.8).
Don't report R63.5 together with the conditions in its Excludes1 note: excessive weight gain in pregnancy (O26.0-) and obesity (E66.-).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific gain weight codes (official index)
- in pregnancy
- low
Don't confuse with (Excludes1 for R63.5)
Common questions about gain weight ICD-10 codes
What is the ICD-10 code for gain weight?
- R63.5 — Abnormal weight gain.
Is R63.5 billable?
- Yes. R63.5 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R63.5 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R63.5 as a principal diagnosis.
Is R63.5 a CC or MCC?
- No. R63.5 is neither a CC nor an MCC under MS-DRG v44.0.