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Home/Diagnosis/ICD-10 Coding for Unexplained Weight Loss

ICD-10 Coding for Unexplained Weight Loss

R63.4
E46
R64

Complete ICD-10-CM coding and documentation guide for icd-10 coding for unexplained weight loss includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
Involuntary Weight Loss
Unintentional Weight Loss
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Key Information: ICD-10 Coding for Unexplained Weight Loss

Essential facts and insights about ICD-10 Coding for Unexplained Weight Loss

Use ICD-10 code R63.4 for abnormal weight loss, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Abnormal weight loss

Billable Code
R63.4
Billable

Diagnostic Criteria

clinical:
  • Weight loss ≥5% over 6-12 months with no identifiable cause
documentation:
  • Negative workup for underlying conditions

Applicable To

  • • Unexplained weight loss

Important Notes

  • • Ensure documentation specifies unintentional weight loss and rules out other causes.

Unspecified protein-calorie malnutrition

Billable Code
E46
Billable

Diagnostic Criteria

clinical_validation_requirements:
  • • Albumin <3.5 g/dL
  • • BMI <18.5

Applicable To

  • • Malnutrition-related weight loss

Important Notes

  • • Ensure lab results support malnutrition diagnosis.

Cachexia

Billable Code
R64
Billable

Diagnostic Criteria

clinical_validation_requirements:
  • • Documented muscle wasting
  • • Associated with chronic illness

Applicable To

  • • Severe muscle wasting

Important Notes

  • • Document muscle wasting and associated chronic illness.
Frequently Asked Questions

What is the ICD-10 code for unexplained weight loss?

The ICD-10 code for unexplained weight loss is R63.4, used when weight loss is ≥5% over 6-12 months with no identifiable cause.

How do you code weight loss due to malnutrition?

Use ICD-10 code E46 for weight loss due to confirmed malnutrition, supported by lab tests like low albumin.

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