ICD-10-CM 2027
ICD-10 code for loss weight
From the official ICD-10-CM alphabetic index entry “Weight › loss (abnormal) (cause unknown)”. Page updated September 29, 2026.
About coding loss weight
The ICD-10-CM code for loss weight is R63.4 (Abnormal weight loss).
Within R63 (symptoms and signs concerning food and fluid intake), R63.4 is specifically for abnormal weight loss. Related codes cover Anorexia (R63.0), Polydipsia (R63.1), Polyphagia (R63.2), feeding difficulties (R63.3), abnormal weight gain (R63.5), Underweight (R63.6) and other symptoms and signs concerning food and fluid intake (R63.8).
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.
Common questions about loss weight ICD-10 codes
What is the ICD-10 code for loss weight?
- R63.4 — Abnormal weight loss.
Is R63.4 billable?
- Yes. R63.4 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R63.4 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R63.4 as a principal diagnosis.
Is R63.4 a CC or MCC?
- No. R63.4 is neither a CC nor an MCC under MS-DRG v44.0.