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v1.0.0
ICD-10 Guide
DiagnosesAppendicolith

Appendicolith

ICD-10 Coding for Appendicolith(K38.1, K35.211)

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

Diagnosis Overview

What is Appendicolith?
Essential facts and insights about Appendicolith

Key Clinical Considerations:

  • Patients may present with right lower quadrant pain, nausea, vomiting, and fever.
  • Imaging studies such as ultrasound or CT scan may reveal the presence of an appendicolith.
  • Physical examination may show tenderness in the right lower quadrant, rebound tenderness, or guarding.
  • Imaging findings may include a calcified structure within the appendix, often associated with appendicitis.
  • Severity can be assessed based on the presence of complications such as perforation or abscess formation.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Medical records must document the patient's symptoms, physical examination findings, and imaging results.
  • Specific terminology such as 'appendicolith' and 'appendicitis' must be clearly stated.
  • Examples include: 'Patient presents with right lower quadrant pain and imaging confirms appendicolith.'
  • Documentation must establish medical necessity for imaging and surgical interventions.
  • Quality measures may include documentation of pain assessment and follow-up care plans.

Coding Guidelines

Usage Guidelines & Examples

  • Use K38.1 for cases where appendicolith is present without appendicitis; use K35.211 when appendicitis is confirmed.
  • Do not use K38.1 if the patient has a different diagnosis such as diverticulitis or other abdominal conditions.
  • K35.2 (Acute appendicitis with perforation) may be considered if complications arise.
  • Common errors include misclassifying appendicolith as appendicitis without proper documentation.
  • In complex cases, ensure to differentiate between acute and chronic conditions and document accordingly.

Code Exclusions

Important Exclusions

  • Excludes conditions such as diverticulitis, Crohn's disease, and other gastrointestinal disorders.
  • Alternative codes for excluded conditions include K57 (Diverticular disease) and K50 (Crohn's disease).
  • Conditions are excluded to ensure accurate diagnosis and treatment pathways.
  • Common mistakes include failing to differentiate between appendicitis and other abdominal conditions.
  • Related but distinct conditions include mesenteric lymphadenitis and pelvic inflammatory disease.

Related ICD-10 Codes

Primary Codes
K38.1
Appendicolith
K35.211
Acute appendicitis with appendicolith
Ancillary Codes
R10.31
Z87.898
Differential Codes
K35.2-
K38.1

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

General Surgery

Specialty Applications

  • This diagnosis applies to patients with appendicitis or appendicoliths, typically in the age range of 10-30 years.
  • Both genders are affected, but males may have a slightly higher incidence.
  • Clinical settings include emergency departments, outpatient clinics, and inpatient surgical units.
  • General surgery is the primary specialty involved in the management of appendicolith.
  • Treatment contexts include surgical intervention or conservative management based on clinical presentation.

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: 'Patient diagnosed with appendicolith based on imaging findings.'

Template 2

Template: 'Clinical presentation consistent with appendicitis including right lower quadrant pain and fever.'

Template 3

Template: 'Diagnostic criteria for appendicolith met as evidenced by CT scan findings.'

Template 4

Template: 'Treatment plan initiated for appendicitis with appendicolith including laparoscopic appendectomy.'

Template 5

Template: 'Follow-up care for appendicolith including monitoring for complications post-surgery.'

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 diagnosis?

Documentation must include clinical findings, imaging results, and treatment plans.

How does this differ from similar diagnoses?

Appendicolith is specifically a calcified structure in the appendix, while appendicitis refers to inflammation.

What are common billing considerations?

Ensure that the diagnosis is clearly linked to the services provided to optimize reimbursement.

What procedures are typically associated?

Common CPT codes include appendectomy and imaging studies such as ultrasound or CT.

Are there any quality reporting implications?

Quality measures may include timely diagnosis and appropriate surgical intervention for appendicitis.