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v1.0.0
ICD-10 Guide
DiagnosesWell Child Check

Well Child Check

ICD-10 Coding for Well Child Check(Z00.129, Z00.121)

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

Diagnosis Overview

What is Well Child Check?
Essential facts and insights about Well Child Check

Key Clinical Considerations:

  • Routine assessment of growth and development
  • Screening for developmental delays and behavioral issues
  • Immunization status review

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient's age and developmental milestones
  • Immunization history and updates
  • Results of any screening tests performed

Coding Guidelines

Usage Guidelines & Examples

  • Use Z00.129 for well visits without issues; Z00.121 if any abnormal findings are noted.
  • Common errors include using sick visit codes for well child checks.

Code Exclusions

Important Exclusions

  • Acute illnesses or injuries
  • Codes for specific developmental disorders

Related ICD-10 Codes

Primary Codes
Z00.129
Encounter for routine child health examination without abnormal findings
Z00.121
Encounter for routine child health examination with abnormal findings
Ancillary Codes
E66.9
Z00.121
if obesity is noted as an abnormal finding.
Differential Codes
Z00.121
Z00.121
if any abnormal findings are present during the examination.
Z00.129
Z00.129
if no abnormalities are present.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Pediatrics

Specialty Applications

  • Children from birth to 18 years
  • Pediatric clinics, family practice offices, and community health centers

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

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 are the documentation requirements?

Document growth parameters, developmental milestones, and any concerns raised during the visit.

What are the billing considerations?

Ensure proper coding based on findings and include any preventive services provided.