DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Block · Chapter 21

Z20-Z29 Persons with potential health hazards related to communicable diseases (Z20-Z29)

Block Z20-Z29 groups 6 categories with 65 billable codes in FY2027.

Where it sits

  1. Chapter 21 Factors influencing health status and contact with health services (Z00-Z99)
  2. Z20-Z29 Persons with potential health hazards related to communicable diseases (Z20-Z29)

Neighbouring blocks

Categories
6
Billable codes
65
CC codes
0
MCC codes
0
HCC V28 codes
1
New FY2027
0

Categories in Z20-Z29

  • Z20

    Contact with and (suspected) exposure to communicable diseases

    Rabiescontact → Z20.3

    • 18 billable codes
  • Z21

    Asymptomatic human immunodeficiency virus [HIV] infection status

    HIVpositive, seropositive → Z21

    • Billable, no subdivisions
    • 1 with HCC
  • Z22

    Carrier of infectious disease

    LTBI (latent tuberculosis infection) → Z22.7

    • 20 billable codes
  • Z23

    Encounter for immunization

    Prophylacticvaccination → Z23

    • Billable, no subdivisions
  • Z28

    Immunization not carried out and underimmunization status

    Underimmunization status → Z28.39

    • 17 billable codes
  • Z29

    Encounter for other prophylactic measures

    Encounter (with health service) (for)prophylactic measures → Z29.9

    • 8 billable codes

FY2027 changes in Z20-Z29

  • Z29.14 Encounter for prophylactic rabies immune globulin Title revised FY2027

Index main terms

  • Carrier (suspected) of → Z22 (40 entries)
  • Contact (with) → Z20 (39 entries)
  • Exposure (to) → Z20 (35 entries)
  • Immunization → Z23, Z28 (23 entries)
  • Encounter (with health service) (for) → Z29 (10 entries)
  • Status (post) → Z21, Z28 (8 entries)
  • COVID-19 → Z20, Z28 (4 entries)
  • Human → Z20, Z21, Z22 (4 entries)
  • Tuberculosis, tubercular, tuberculous (calcification) (calcified) (caseous) (chromogenic acid-fast bacilli) (degeneration) (fibrocaseous) (fistula) (interstitial) (isolated circumscribed lesions) (necrosis) (parenchymatous) (ulcerative) → Z20, Z22 (4 entries)
  • Underimmunization status → Z28 (4 entries)
  • Vaccination (prophylactic) → Z23, Z28 (3 entries)
  • Colonization → Z22 (2 entries)
  • Delinquent immunization status → Z28 (2 entries)
  • Gonorrhea (acute) (chronic) → Z20 (2 entries)
  • Positive → Z22 (2 entries)

+18 more main terms; the search box finds them by word.

Block instructions

Notes that also apply

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