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v1.0.0
ICD-10 Guide
DiagnosesAbnormal Lab Findings

Abnormal Lab Findings

ICD-10 Coding for Abnormal Lab Findings(R73.09, R79.1, R74.0)

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

Diagnosis Overview

What is Abnormal Lab Findings?
Essential facts and insights about Abnormal Lab Findings

Key Clinical Considerations:

  • Presence of abnormal results in laboratory tests
  • Specific abnormal findings in blood, urine, or other bodily fluids

Clinical Information

Clinical Criteria & Documentation Requirements

  • Detailed description of the abnormal lab findings
  • Documentation of the specific lab tests conducted
  • Clinical relevance of the abnormal findings

Coding Guidelines

Usage Guidelines & Examples

  • R73.09 is used for other abnormal glucose levels, R79.1 for abnormal serum enzyme levels, and R74.0 for nonspecific elevation of levels of transaminase and lactic acid dehydrogenase (LDH)
  • Selection of the correct code depends on the specific abnormal lab finding

Code Exclusions

Important Exclusions

  • Abnormal findings on antenatal screening of mother (O28.-)
  • Encounter for examination for administrative purposes (Z02.-)

Related ICD-10 Codes

Primary Codes
R73.09
Other abnormal glucose
R79.1
Abnormal serum enzyme levels
R74.0
Nonspecific elevation of levels of transaminase and lactic acid dehydrogenase (LDH)
Differential Codes
E11.9
E11.9
if diabetes is confirmed with symptoms or Hb
D89.9
D89.9
if an autoimmune disorder is confirmed.
K76.0
K76.0
if fatty liver is confirmed via imaging.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Primary Care

Specialty Applications

  • Abnormal findings on examination of blood, without diagnosis
  • Abnormal findings on examination of urine, without diagnosis
  • Abnormal findings on examination of other body fluids, substances and tissues, without diagnosis

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's lab results indicate abnormal glucose levels (R73.09).

Template 2

Abnormal serum enzyme levels (R79.1) found in patient's lab results.

Template 3

Nonspecific elevation of levels of transaminase and lactic acid dehydrogenase (LDH) (R74.0) observed in lab findings.

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 any abnormal lab findings?

No, these codes are specific to the type of abnormal lab finding. For example, R73.09 is specific to abnormal glucose levels.

When should this code be used?

These codes should be used when there are abnormal lab findings without a definitive diagnosis.