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v1.0.0
ICD-10 Guide
DiagnosesMetformin

Metformin

ICD-10 Coding for Metformin Use in Diabetes(E11.9, Z79.84)

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

Diagnosis Overview

What is Metformin?
Essential facts and insights about Metformin Use in Diabetes

Key Clinical Considerations:

  • Hyperglycemia, polyuria, polydipsia, fatigue
  • Fasting plasma glucose, HbA1c levels, oral glucose tolerance test
  • Obesity, acanthosis nigricans, signs of insulin resistance

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, medication list, lab results, treatment plan
  • ICD-10-CM codes for diabetes, metformin usage, complications
  • Example: 'Patient diagnosed with Type 2 Diabetes Mellitus, prescribed Metformin 500 mg BID.'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for diabetes coding and metformin therapy.
  • Common errors include incorrect coding of diabetes type or complications.

Code Exclusions

Important Exclusions

  • Type 1 Diabetes Mellitus, gestational diabetes
  • Alternative codes for diabetes complications or other medications

Related ICD-10 Codes

Primary Codes
E11.9
Type 2 diabetes mellitus without complications
E11.65
Type 2 diabetes mellitus with hyperglycemia
Ancillary Codes
Z79.84
E11.9
to indicate ongoing metformin therapy.
Differential Codes
E11.649

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Endocrinology

Specialty Applications

  • Adults with Type 2 Diabetes Mellitus, patients with insulin resistance
  • Endocrinology clinics, primary care settings

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 diagnosis, treatment plan, and response to therapy.

Billing considerations?

Ensure correct ICD-10 codes are used to reflect the diagnosis.