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ICD-10 Guide
DiagnosesMagnesium Screening

Magnesium Screening

ICD-10 Coding for Magnesium Screening(E83.42, N18.3)

PRIMARY SPECIALTYNephrology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Magnesium Screening?
Essential facts and insights about Magnesium Screening

Key Clinical Considerations:

  • Muscle weakness or cramps
  • Arrhythmias or palpitations
  • Key diagnostic tests include serum magnesium levels, 24-hour urine magnesium excretion
  • Physical exam findings may include neuromuscular irritability, tremors, or altered mental status

Clinical Information

Clinical Criteria & Documentation Requirements

  • Required documentation elements include patient history, clinical signs, and test results
  • Specific coding terminology includes 'hypomagnesemia' and 'hypermagnesemia'
  • Documentation examples: 'Patient presents with muscle cramps and low serum magnesium levels of 1.2 mg/dL.'

Coding Guidelines

Usage Guidelines & Examples

  • Usage guidelines: Use specific codes for hypomagnesemia or hypermagnesemia based on lab results.
  • Common errors: Misclassifying magnesium levels or not documenting clinical symptoms.

Code Exclusions

Important Exclusions

  • Excluded conditions: Magnesium deficiency due to malnutrition or malabsorption not related to kidney function.
  • Alternative codes: Consider using E83.40 for unspecified magnesium disorder.

Related ICD-10 Codes

Primary Codes
E83.42
Hypomagnesemia
E83.41
Hypermagnesemia
Ancillary Codes
R25.2
Differential Codes
E87.4
E87.4
when serum magnesium is >2.2 mg/dL.
N18.4
N18.4
for eGFR 15-29 mL/min/1.73m².

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • Patient populations: Individuals with chronic kidney disease, gastrointestinal disorders, or those on certain medications.
  • Clinical settings: Nephrology clinics, hospitals, and outpatient care.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Include clinical symptoms, test results, and treatment plans.

Billing considerations?

Ensure accurate coding to reflect the specific magnesium disorder for reimbursement.