Z00.121 Encounter for routine child health examination with abnormal findings

The ICD-10-CM code for Encounter for routine child health examination with abnormal findings is Z00.121 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

21: Factors influencing health status and contact with health services (Z00-Z99)

Section

Z00-Z13: Persons encountering health services for examinations (Z00-Z13)

Category Z00

19 codes (13 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to Z00.121:

• Hearing examination › infant or child (over 28 days old) › with abnormal findings
• Examination (for) (following) (general) (of) (routine) › child (over 28 days old) › with abnormal findings
• Screening (for) › infant or child (over 28 days old) › with abnormal findings
• Test, tests, testing (for) › hearing › infant or child (over 28 days old) › with abnormal findings
• Admission (for) › vision examination › infant or child (over 28 days old) › with abnormal findings
• Immunization › appropriate for age › child (over 28 days old) › with abnormal findings
• Examination (for) (following) (general) (of) (routine) › hearing › infant or child (over 28 days old) › with abnormal findings
• Examination (for) (following) (general) (of) (routine) › vision › infant or child (over 28 days old) › with abnormal findings

U.S. Hospital Utilization

• An estimated 260 U.S. inpatient stays in 2023 included Z00.121 among the documented diagnoses.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Used with any code in range A00.0-T88.9, Z00-Z99

1) Used with any code in the range of A00.0-T88.9, Z00-Z99 An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. Though they are most applicable to injuries, they are also valid for use with such things as infections or diseases due to an external source, and other health conditions, such as a heart attack that occurs during strenuous physical activity.

Code ranges A00.0-T88.9, Z00-Z99.8, U00-U85 (TOC)

3. Code or codes from A00.0 through T88.9, Z00-Z99.8, U00-U85 .......................................... 13

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)