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

Code Range: Z00 — Z99 15 Sections FY 2026

This chapter of the ICD-10-CM classification covers diagnosis codes from Z00 through Z99. Browse the sections below to find specific diagnosis codes within this chapter.

Chapter Notes

Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Sections

Z00-Z13 Persons encountering health services for examinations (Z00-Z13)
206 codes
Z14-Z15 Genetic carrier and genetic susceptibility to disease (Z14-Z15)
24 codes
Z16 Resistance to antimicrobial drugs (Z16)
24 codes
Z17 Estrogen, and other hormones and factors receptor status (Z17)
16 codes
Z18 Retained foreign body fragments (Z18)
19 codes
Z19 Hormone sensitivity malignancy status (Z19)
3 codes
Z20-Z29 Persons with potential health hazards related to communicable diseases (Z20-Z29)
85 codes
Z30-Z39 Persons encountering health services in circumstances related to reproduction (Z30-Z39)
194 codes
Z40-Z53 Encounters for other specific health care (Z40-Z53)
221 codes
Z55-Z65 Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65)
145 codes
Z66 Do not resuscitate status (Z66)
1 code
Z67 Blood type (Z67)
21 codes
Z68 Body mass index [BMI] (Z68)
37 codes
Z69-Z76 Persons encountering health services in other circumstances (Z69-Z76)
109 codes
Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)
739 codes

Top-Level Codes in This Chapter

Z00 Encounter for general examination without complaint, suspected or reported diagnosis
Z01 Encounter for other special examination without complaint, suspected or reported diagnosis
Z02 Encounter for administrative examination
Z03 Encounter for medical observation for suspected diseases and conditions ruled out
Z04 Encounter for examination and observation for other reasons
Z05 Encounter for observation and evaluation of newborn for suspected diseases and conditions ruled out
Z08 Encounter for follow-up examination after completed treatment for malignant neoplasm Billable
Z09 Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm Billable
Z11 Encounter for screening for infectious and parasitic diseases
Z12 Encounter for screening for malignant neoplasms
Z13 Encounter for screening for other diseases and disorders
Z14 Genetic carrier
Z15 Genetic susceptibility to disease
Z16 Resistance to antimicrobial drugs
Z17 Estrogen, and other hormones and factors receptor status
Z18 Retained foreign body fragments
Z19 Hormone sensitivity malignancy status
Z20 Contact with and (suspected) exposure to communicable diseases
Z21 Asymptomatic human immunodeficiency virus [HIV] infection status Billable
Z22 Carrier of infectious disease
Z23 Encounter for immunization Billable
Z28 Immunization not carried out and underimmunization status
Z29 Encounter for other prophylactic measures
Z30 Encounter for contraceptive management
Z31 Encounter for procreative management
Z32 Encounter for pregnancy test and childbirth and childcare instruction
Z33 Pregnant state
Z34 Encounter for supervision of normal pregnancy
Z36 Encounter for antenatal screening of mother
Z37 Outcome of delivery
Z38 Liveborn infants according to place of birth and type of delivery
Z39 Encounter for maternal postpartum care and examination
Z3A Weeks of gestation
Z40 Encounter for prophylactic surgery
Z41 Encounter for procedures for purposes other than remedying health state
Z42 Encounter for plastic and reconstructive surgery following medical procedure or healed injury
Z43 Encounter for attention to artificial openings
Z44 Encounter for fitting and adjustment of external prosthetic device
Z45 Encounter for adjustment and management of implanted device
Z46 Encounter for fitting and adjustment of other devices
Z47 Orthopedic aftercare
Z48 Encounter for other postprocedural aftercare
Z49 Encounter for care involving renal dialysis
Z51 Encounter for other aftercare and medical care
Z52 Donors of organs and tissues
Z53 Persons encountering health services for specific procedures and treatment, not carried out
Z55 Problems related to education and literacy
Z56 Problems related to employment and unemployment
Z57 Occupational exposure to risk factors
Z58 Problems related to physical environment
Z59 Problems related to housing and economic circumstances
Z60 Problems related to social environment
Z62 Problems related to upbringing
Z63 Other problems related to primary support group, including family circumstances
Z64 Problems related to certain psychosocial circumstances
Z65 Problems related to other psychosocial circumstances
Z66 Do not resuscitate Billable
Z67 Blood type
Z68 Body mass index [BMI]
Z69 Encounter for mental health services for victim and perpetrator of abuse
Z70 Counseling related to sexual attitude, behavior and orientation
Z71 Persons encountering health services for other counseling and medical advice, not elsewhere classified
Z72 Problems related to lifestyle
Z73 Problems related to life management difficulty
Z74 Problems related to care provider dependency
Z75 Problems related to medical facilities and other health care
Z76 Persons encountering health services in other circumstances
Z77 Other contact with and (suspected) exposures hazardous to health
Z78 Other specified health status
Z79 Long term (current) drug therapy
Z80 Family history of primary malignant neoplasm
Z81 Family history of mental and behavioral disorders
Z82 Family history of certain disabilities and chronic diseases (leading to disablement)
Z83 Family history of other specific disorders
Z84 Family history of other conditions
Z85 Personal history of malignant neoplasm
Z86 Personal history of certain other diseases
Z87 Personal history of other diseases and conditions
Z88 Allergy status to drugs, medicaments and biological substances
Z89 Acquired absence of limb
Z90 Acquired absence of organs, not elsewhere classified
Z91 Personal risk factors, not elsewhere classified
Z92 Personal history of medical treatment
Z93 Artificial opening status
Z94 Transplanted organ and tissue status
Z95 Presence of cardiac and vascular implants and grafts
Z96 Presence of other functional implants
Z97 Presence of other devices
Z98 Other postprocedural states
Z99 Dependence on enabling machines and devices, not elsewhere classified

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