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ICD-10 Guide
DiagnosesAbnormal Laboratory Values

Abnormal Laboratory Values

ICD-10 Coding for Abnormal Laboratory Values(R73.09, R74.0)

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

Diagnosis Overview

What is Abnormal Laboratory Values?
Essential facts and insights about Abnormal Laboratory Values

Key Clinical Considerations:

  • Presence of abnormal results in laboratory tests such as blood glucose, liver function tests, kidney function tests, etc.
  • Significant deviation from the normal range in any laboratory value

Clinical Information

Clinical Criteria & Documentation Requirements

  • Specific laboratory test that yielded abnormal results
  • Exact values of the abnormal results and how they deviate from the normal range
  • Clinical significance of the abnormal laboratory values

Coding Guidelines

Usage Guidelines & Examples

  • R73.09 is used for other abnormal glucose levels, while R74.0 is used for abnormal serum enzyme levels
  • R73.09 and R74.0 should be used when the abnormality is confirmed, not for initial findings

Code Exclusions

Important Exclusions

  • Abnormal findings on antenatal screening of mother (O28.-)
  • Abnormal findings on diagnostic imaging and in function studies, without diagnosis (R93-R94)

Related ICD-10 Codes

Primary Codes
R73.09
Other abnormal glucose
R74.0
Abnormal level of serum enzymes
Differential Codes
E11.65
K76.89

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Endocrinology

Specialty Applications

  • Patients with abnormal blood glucose levels
  • Patients with abnormal serum enzyme levels

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

Template 1

Patient has confirmed abnormal glucose levels, specifically [insert specific values].

Template 2

Patient's serum enzyme levels are abnormal, with [insert specific enzymes] at [insert specific values].

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

Can these codes be used for initial abnormal findings?

No, these codes should be used only when the abnormality is confirmed.

When should this code be used?

These codes should be used when there are confirmed abnormal laboratory values related to glucose levels (R73.09) or serum enzymes (R74.0).