ICD-10-CM · Chapter 18 · R00-R99
R64 Cachexia
Excludes 1 (cannot be coded together)
- abnormal weight loss (R63.4)
- cachexia due to underlying condition (E88.A)
- nutritional marasmus (E41)
This category is a complete, billable diagnosis code.
No additional specificity is required — submit R64 directly on claims and documentation without a subcode extension.
Plain-language term for this code
The following entry in the US Medical Glossary corresponds to ICD-10-CM category R64:
- Unexplained Weight Loss — Pérdida de peso inexplicada
Last reviewed: September 2026