✅ Chapter 21 · Z00-Z99

Health Checkups Diagnosis Codes

Z-codes document encounters that aren't related to a specific illness. This includes routine checkups, immunizations, screening exams, family history, and post-surgical follow-ups. They're used when you visit your doctor for preventive care rather than a specific complaint.

About This Chapter

Chapter 21 of the ICD-10-CM classification covers factors influencing health status and contact with health services, spanning codes Z00-Z99. These codes are used by healthcare providers to document diagnoses in your electronic health record (EHR), on insurance claims, and on medical bills.

Why this matters: If you see a code starting with Z on your medical bill or health records, it likely falls in this chapter. Understanding what chapter your code belongs to can help you make sense of your diagnosis and ask better questions at your next appointment.

Diagnosis Codes in This Chapter

Browse the 17 diagnosis codes we currently cover in this chapter. Select any code to read a plain-English explanation.

Z00.00Encounter for General Adult Medical Examin... Z00.129Encounter for Routine Child Health Examin... Z01.10Encounter for Examination of Ears and Hear... Z12.11Encounter for Screening for Malignant Neop... Z12.31Encounter for Screening Mammogram... Z23Encounter for Immunization Z33.1Pregnant State Z34.90Encounter for Supervision of Normal Pregna... Z36Encounter for Antenatal Screening Z3A.00Weeks of Gestation, Unspecified Z79.4Long Term Use of Insulin Z79.899Long Term Use of Other Medications... Z86.73Personal History of Transient Ischemic Att... Z87.39Personal History of Other Diseases of Musc... Z96.641Presence of Right Artificial Hip Joint... Z96.649Presence of Artificial Joint Z97.8Presence of Other Specified Devices...