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v1.0.0
ICD-10 Guide
ICD-10 CodesR79

R79

Other abnormal findings of blood chemistry

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/11/2025

Code Description

ICD-10 R79 is a billable code used to indicate a diagnosis of other abnormal findings of blood chemistry.

Key Diagnostic Point:

R79 encompasses a variety of abnormal findings in blood chemistry that do not fit into more specific categories. These findings may include abnormal levels of electrolytes, enzymes, proteins, or metabolites that are not classified elsewhere. Clinically, these abnormalities can indicate a range of underlying conditions, from metabolic disorders to organ dysfunction. For instance, elevated liver enzymes may suggest hepatic injury, while abnormal electrolyte levels can indicate renal dysfunction or dehydration. The clinical context is crucial, as these findings often require further investigation to determine their significance. A comprehensive diagnostic approach typically involves correlating laboratory results with clinical symptoms, patient history, and additional testing as needed. It is essential for healthcare providers to document the clinical rationale for ordering specific tests and the interpretation of abnormal results to ensure accurate coding and billing.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of potential underlying conditions
  • Need for correlation with clinical symptoms
  • Variability in laboratory reference ranges
  • Potential for overlapping symptoms with other codes

Audit Risk Factors

  • Insufficient documentation linking findings to clinical conditions
  • Failure to specify the nature of the abnormality
  • Inconsistent use of laboratory results across encounters
  • Lack of follow-up documentation for abnormal findings

Specialty Focus

Medical Specialties

Internal Medicine

Documentation Requirements

Detailed patient history, clinical findings, and rationale for testing must be documented.

Common Clinical Scenarios

Patients presenting with fatigue, unexplained weight loss, or abnormal routine lab results.

Billing Considerations

Ensure that all abnormal findings are linked to a clinical diagnosis or further testing plan.

Emergency Medicine

Documentation Requirements

Acute care documentation must include immediate clinical findings and rationale for lab tests.

Common Clinical Scenarios

Patients with acute symptoms such as chest pain or altered mental status requiring rapid lab evaluation.

Billing Considerations

Document the urgency of the findings and any immediate interventions taken.

Coding Guidelines

Inclusion Criteria

Use R79 When
  • Coders should refer to the official ICD
  • CM guidelines, ensuring that the abnormal findings are not classified under more specific codes
  • Documentation must support the use of R79, including the clinical significance of the findings

Exclusion Criteria

Do NOT use R79 When
No specific exclusions found.

Related Codes

Child Codes

8 codes
R79.0
Abnormal level of blood mineral
R79.1
Abnormal coagulation profile
R79.8
Other specified abnormal findings of blood chemistry
R79.81
Abnormal blood-gas level
R79.82
Elevated C-reactive protein (CRP)
R79.83
Abnormal findings of blood amino-acid level
R79.89
Other specified abnormal findings of blood chemistry
R79.9
Abnormal finding of blood chemistry, unspecified

Related CPT Codes

80048CPT Code

Basic metabolic panel

Clinical Scenario

Used to assess electrolyte levels and kidney function.

Documentation Requirements

Document the reason for the test and any abnormal findings.

Specialty Considerations

Internal medicine may require more detailed documentation compared to urgent care settings.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of abnormal findings, but R79 remains a catch-all for findings that do not fit elsewhere. Coders must be diligent in ensuring that the use of this code is justified by clinical documentation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of abnormal findings, but R79 remains a catch-all for findings that do not fit elsewhere. Coders must be diligent in ensuring that the use of this code is justified by clinical documentation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of abnormal findings, but R79 remains a catch-all for findings that do not fit elsewhere. Coders must be diligent in ensuring that the use of this code is justified by clinical documentation.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

When should I use R79?

Use R79 when there are abnormal findings in blood chemistry that do not fit into more specific categories, ensuring that the clinical context is well-documented.