ICD-10 Guide

Abnormal Pet Scan

ICD-10 Coding for Abnormal PET Scan Findings(R93.89)

PRIMARY SPECIALTYOncology

COMPLEXITYHigh

LAST UPDATED09/15/2025

Sam Tuffun, PT, DPT

Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Abnormal Pet Scan?

An abnormal PET scan indicates unexpected findings that may suggest the presence of malignancy or other pathological processes. Key clinical points include: 1) Abnormal PET scans can reveal hypermetabolic lesions, which may indicate cancer; 2) They are often used in oncology for staging, treatment response evaluation, and recurrence detection; 3) PET scans can also assist in differentiating between benign and malignant lesions. Etiologically, abnormal findings may arise from various conditions, including infections, inflammatory diseases, and malignancies. Pathophysiologically, increased glucose metabolism in tissues can signal active disease processes. Clinically, patients may present with symptoms related to the underlying condition, such as unexplained weight loss, pain, or fatigue. Typical use cases for this diagnosis code include follow-up assessments in cancer patients and evaluations of new symptoms in patients with a history of malignancy.

Key Clinical Considerations:

Abnormal PET scan results must correlate with clinical findings and other diagnostic tests.
Signs may include unexplained weight loss, persistent pain, or new neurological symptoms.
Resolution criteria involve normalization of PET findings after treatment.
Imaging findings may show increased uptake in specific areas, indicating potential malignancy.

Clinical Information

Clinical Criteria & Documentation Requirements

Documentation must include the reason for the PET scan, findings, and clinical correlation.
Compliant documentation: 'PET scan shows hypermetabolic activity in the right lung, correlating with a known history of lung cancer.' Non-compliant: 'PET scan done.'
Template phrases: 'Patient's PET scan indicates [specific findings] consistent with [diagnosis].'
Medical necessity requires justification of the scan based on clinical symptoms and history.

Coding Guidelines

Usage Guidelines & Examples

Use R93.89 when abnormal findings are reported without a definitive diagnosis; for example, a follow-up scan in a patient with a history of breast cancer.
Do NOT use this code when a specific diagnosis is established, such as a confirmed malignancy.
Correct usage: 'Abnormal PET scan indicating possible recurrence of lymphoma.' Incorrect: 'PET scan abnormal.'
Common errors include using this code for routine screenings; ensure clinical context is documented.

Code Exclusions

Important Exclusions

Excluded conditions include benign tumors or non-cancerous lesions that do not require this code.
Alternative codes may include R93.0 for abnormal findings on imaging without malignancy.
Common exclusion errors involve misclassifying benign findings as abnormal; ensure clarity in documentation.
Certain conditions are excluded to maintain specificity in coding and avoid misrepresentation of patient status.

Specialty Focus

Primary Specialty

Oncology

Specialty Applications

This diagnosis applies to patients undergoing evaluation for suspected malignancies.
Appropriate in scenarios involving follow-up imaging for cancer patients.
Applicable in both inpatient and outpatient settings, especially in oncology clinics.
Specialty considerations include oncology, radiology, and primary care.

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

Template: 'Abnormal PET scan diagnosed based on increased uptake in [specific area].'

Template 2

Template: 'Patient presents with [symptoms] consistent with abnormal PET findings.'

Template 3

Template: 'Diagnostic criteria met: PET scan shows [specific findings].'

Template 4

Template: 'Treatment plan includes [interventions] for abnormal findings on PET scan.'

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

What documentation is required for this code?

Documentation must include the indication for the PET scan, findings, and correlation with clinical symptoms.

When should this code be used vs similar codes?

Use R93.89 for abnormal findings without a definitive diagnosis; use specific codes for confirmed conditions.

What are common billing issues with this code?

Issues may arise from lack of medical necessity documentation; ensure all clinical indications are clearly stated.

What procedures are commonly associated?

CPT codes for PET scans and related imaging studies, such as 78815 for PET imaging.

What is Abnormal Pet Scan?

Key Clinical Considerations:

Abnormal PET scan results must correlate with clinical findings and other diagnostic tests.
Signs may include unexplained weight loss, persistent pain, or new neurological symptoms.
Resolution criteria involve normalization of PET findings after treatment.
Imaging findings may show increased uptake in specific areas, indicating potential malignancy.

Abnormal Pet Scan

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?

Abnormal Pet Scan

Diagnosis Overview

Key Clinical Considerations:

Clinical Information

Clinical Criteria & Documentation Requirements

Coding Guidelines

Usage Guidelines & Examples

Code Exclusions

Important Exclusions

Related ICD-10 Codes

Related CPT Codes

Specialty Focus

Primary Specialty

Specialty Applications

Coding Complexity

Documentation

Documentation Templates

Template 1

Template 2

Template 3

Template 4

Billing Information

Billing Considerations

Common Issues

Frequently Asked Questions

What documentation is required for this code?

When should this code be used vs similar codes?

What are common billing issues with this code?

What procedures are commonly associated?