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v1.0.0
ICD-10 Guide
DiagnosesAbnormal Blood Chemistry

Abnormal Blood Chemistry

ICD-10 Coding for Abnormal Blood Chemistry(R79.89)

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

Diagnosis Overview

What is Abnormal Blood Chemistry?
Essential facts and insights about Abnormal Blood Chemistry

Key Clinical Considerations:

  • Presence of abnormal levels of electrolytes, proteins, lipids, or other substances in the blood.
  • Signs and symptoms that may indicate a systemic disease affecting blood chemistry.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Specific substances in the blood that are at abnormal levels.
  • Underlying cause of the abnormal blood chemistry, if known.
  • Clinical significance of the abnormal findings.

Coding Guidelines

Usage Guidelines & Examples

  • R79.89 is used for unspecified abnormalities in blood chemistry, while other codes in the R79 series may be used for specific abnormalities.
  • R79.89 should not be used if a more specific code is available.

Code Exclusions

Important Exclusions

  • Abnormal findings on antenatal screening of mother (O28.-)
  • Abnormal glucose (R73.-)

Related ICD-10 Codes

Primary Codes
R79.89
Other specified abnormal findings of blood chemistry
Ancillary Codes
E87.2
N18.9
Differential Codes
R79.0
R79.0
for specific mineral abnormalities like hypermagnesemia.
R79.1
R79.1
for abnormal coagulation test results.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Nephrology

Specialty Applications

  • Abnormal findings on diagnostic examination of blood, without diagnosis.
  • Abnormal results of function studies of peripheral vascular system.

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 presents with abnormal blood chemistry, specifically [substance].

Template 2

Abnormal findings on diagnostic examination of blood, without diagnosis.

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 R79.89 be used for abnormal findings on antenatal screening?

No, abnormal findings on antenatal screening should be coded with O28.-.

When should R79.89 be used?

R79.89 should be used when there are abnormal findings in blood chemistry, but no specific diagnosis can be made.