DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 21

Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Block Z77-Z99 groups 23 categories with 567 billable codes in FY2027. 14 codes are new this year.

Where it sits

  1. Chapter 21 Factors influencing health status and contact with health services (Z00-Z99)
  2. Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99)

Neighbouring blocks

Categories
23
Billable codes
567
CC codes
13
MCC codes
0
HCC V28 codes
40
New FY2027
14

Categories in Z77-Z99

  • Z77

    Other contact with and (suspected) exposures hazardous to health

    Second hand tobacco smoke exposure (acute) (chronic) → Z77.22

    • 31 billable codes
    • 7 new
  • Z78

    Other specified health status

    Physical restraint status → Z78.1

    • 3 billable codes
  • Z79

    Long term (current) drug therapy

    Prophylacticmedication → Z79.899

    • 32 billable codes
    • 1 with HCC
  • Z80

    Family history of primary malignant neoplasm

    Historyfamily (of)leukemia → Z80.6

    • 16 billable codes
  • Z81

    Family history of mental and behavioral disorders

    Historyfamily (of)alcohol abuse → Z81.1

    • 6 billable codes
  • Z82

    Family history of certain disabilities and chronic diseases (leading to disablement)

    Historyfamily (of)asthma → Z82.5

    • 13 billable codes
  • Z83

    Family history of other specific disorders

    Historyfamily (of)anemia → Z83.2

    • 19 billable codes
  • Z84

    Family history of other conditions

    Consanguinity → Z84.3

    • 9 billable codes
  • Z85

    Personal history of malignant neoplasm

    Historypersonal (of)leukemia → Z85.6

    • 60 billable codes
  • Z86

    Personal history of certain other diseases

    COVID-19history of (personal) → Z86.16

    • 40 billable codes
    • 1 new
  • Z87

    Personal history of other diseases and conditions

    Sexreassignment surgery status → Z87.890-

    • 54 billable codes
    • 6 new
  • Z88

    Allergy status to drugs, medicaments and biological substances

    Historypersonal (of)allergy (to) → Z88.9

    • 10 billable codes
  • Z89

    Acquired absence of limb

    Amputee (bilateral) (old) → Z89.9

    • 49 billable codes
    • 12 with HCC
  • Z90

    Acquired absence of organs, not elsewhere classified

    Status (post)splenectomy → Z90.81

    • 22 billable codes
  • Z91

    Personal risk factors, not elsewhere classified

    Underdosing → Z91.14

    • 62 billable codes
  • Z92

    Personal history of medical treatment

    tPA (rtPA) administration in a different facility within the last 24 hours prior to admission to current facility → Z92.82

    • 19 billable codes
  • Z93

    Artificial opening status

    Jejunostomy status → Z93.4

    • 12 billable codes
    • 12 with HCC
  • Z94

    Transplanted organ and tissue status

    Transplant (ed) (status) → Z94.9

    • 14 billable codes
    • 9 CC
    • 8 with HCC
  • Z95

    Presence of cardiac and vascular implants and grafts

    Presence (of)heart assist device → Z95.811

    • 13 billable codes
    • 2 CC
    • 2 with HCC
  • Z96

    Presence of other functional implants

    Pseudophakia → Z96.1

    • 40 billable codes
  • Z97

    Presence of other devices

    Presence (of)dentures → Z97.2

    • 13 billable codes
    • 3 with HCC
  • Z98

    Other postprocedural states

    Arthrodesis status → Z98.1

    • 23 billable codes
  • Z99

    Dependence on enabling machines and devices, not elsewhere classified

    Status (post)ventilator → Z99.11

    • 7 billable codes
    • 2 CC
    • 2 with HCC

FY2027 changes in Z77-Z99

  • Z77.013 Contact with and (suspected) exposure to gadolinium New FY2027
  • Z77.32 Contact with and (suspected) exposure to burn pits in war theater New FY2027
  • Z77.33 Contact with and (suspected) exposure to Agent Orange New FY2027
  • Z77.40 Contact with and (suspected) exposure to unspecified blast overpressure New FY2027
  • Z77.41 Contact with and (suspected) exposure to low-level blast overpressure New FY2027
  • Z77.42 Contact with and (suspected) exposure to high-level blast overpressure New FY2027
  • Z77.49 Contact with and (suspected) exposure to other blast overpressure New FY2027
  • Z86.17 Personal history of Clostridioides difficile infection New FY2027
  • Z87.8901 Personal history of social gender transition New FY2027
  • Z87.8902 Personal history of medical gender transition New FY2027
  • Z87.8903 Personal history of surgical gender transition New FY2027
  • Z87.8904 Personal history of intersex surgery New FY2027

3 more, and 0 new codes with a 7th character: all FY2027 changes.

Index main terms

  • History → Z80, Z81, Z82, Z83, Z84, Z85, Z86, Z87, Z88, Z90, Z91, Z92, Z98 (524 entries)
  • Presence (of) → Z95, Z96, Z97, Z98, Z99 (123 entries)
  • Status (post) → Z78, Z87, Z90, Z92, Z93, Z95, Z96, Z97, Z98, Z99 (112 entries)
  • Long-term (current) (prophylactic) drug therapy (use of) → Z79 (87 entries)
  • Absence (of) (organ or part) (complete or partial) → Z89, Z90, Z98 (71 entries)
  • Exposure (to) → Z77, Z91 (46 entries)
  • Contact (with) → Z77 (44 entries)
  • Therapy → Z79 (37 entries)
  • Noncompliance → Z91 (29 entries)
  • Replacement by artificial or mechanical device or prosthesis of → Z95, Z96, Z97 (27 entries)
  • Transplant (ed) (status) → Z94, Z95, Z98 (22 entries)
  • Artificial → Z93 (20 entries)
  • Allergy, allergic (reaction) (to) → Z91 (18 entries)
  • Dependence (on) (syndrome) → Z95, Z99 (11 entries)
  • At risk → Z91 (6 entries)

+77 more main terms; the search box finds them by word.

Block instructions

Code also

  • any follow-up examination (Z08-Z09) Z08 Z09

Notes that also apply

Chapter 21 instructions (Notes 3): printed on the chapter 21 page.