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ICD-10/Z00.121

Z00.121 ICD-10-CM Code: Encounter for routine child health examination with abnormal findings

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0 (FY2026), Appendix B.

  • MS-DRG 795 — NORMAL NEWBORN (MDC 15)
  • MS-DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Encounter for routine child health examination with abnormal findings is a billable ICD-10-CM diagnosis code (Z00.121).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for Z00.121 in the official ICD-10-CM tabular list.

Excludes1 — Not Coded Here

Conditions that can never be reported with this code; the two are mutually exclusive.

  • health check for child under 29 days old (Z00.11-)
  • health supervision of foundling or other healthy infant or child (Z76.1-Z76.2)
  • newborn health examination (Z00.11-)
  • encounter for examination for administrative purposes (Z02.-)

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

  • encounter for pre-procedural examinations (Z01.81-)
  • special screening examinations (Z11-Z13)
  • examinations related to pregnancy and reproduction (Z30-Z36, Z39.-)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify abnormal findings

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Z00.121 in its code family, with their registry titles.

  • Z00.1 — Encounter for newborn, infant and child health examinations
  • Z00.11 — Newborn health examination
  • Z00.110 — Health examination for newborn under 8 days old
  • Z00.111 — Health examination for newborn 8 to 28 days old
  • Z00.12 — Encounter for routine child health examination
  • Z00.129 — Encounter for routine child health examination without abnormal findings
  • Z00.2 — Encounter for examination for period of rapid growth in childhood
  • Z00.3 — Encounter for examination for adolescent development state
  • Z00.5 — Encounter for examination of potential donor of organ and tissue
  • Z00.6 — Encounter for examination for normal comparison and control in clinical research program

View all codes in the Z00 family

Indexed Clinical Terms (11)

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code.

  • Admission (for), examination at health care facility (adult), hearing, infant or child (over 28 days old), with abnormal findings
  • Admission (for), examination at health care facility (adult), vision, infant or child (over 28 days old), with abnormal findings
  • Admission (for), vision 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
  • 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
  • Hearing examination, infant or child (over 28 days old), with abnormal findings
  • Immunization, appropriate for age, 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
  • Test, tests, testing (for), vision, infant or child (over 28 days old), with abnormal findings