R63.6

R63.6: Underweight

Billable / specific codeICD-10-CM

R63.6 is a billable, specific ICD-10-CM code for underweight. It is valid for submission on a claim.

Check R63.6 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

abnormal weight loss (R63.4)
anorexia nervosa (F50.0-)
malnutrition (E40-E46)

Use additional code

Add a secondary code to capture the detail described below.

code to identify body mass index (BMI), if known (Z68.-)

Excludes1 inherited from the categories above R63.6

A category’s note binds every code beneath it.

Written on R63: Symptoms and signs concerning food and fluid intake

bulimia NOS (F50.2-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

R63.6 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

A57063Billing and Coding: Diagnostic and Therapeutic Esophagogastroduodenoscopy
A57189Billing and Coding: Serum Magnesium

Alphabetic index entries that lead here

Underweight

Code history

Unchanged in every release from FY2024 to FY2027.