ICD-10 · PDGM grouping
Z20-Z29 — Persons with potential health hazards related to communicable diseases
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in range
65
No clinical group
64
A period cannot be grouped from these.
Barred as primary
3
CMS rejects these in the primary position.
Where these codes group
1 of the 65 codes in Z20-Z29 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. A further 64 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in Z20-Z29
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- Z20Contact with and (suspected) exposure to communicable diseases18 codes
- Z21Asymptomatic human immunodeficiency virus [HIV] infection status1 code
- Z22Carrier of infectious disease20 codes
- Z23Encounter for immunization1 code
- Z28Immunization not carried out and underimmunization status17 codes
- Z29Encounter for other prophylactic measures8 codes
Every code in Z20-Z29
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| Z2001 | Cntct w and expsr to intestnl infct dis d/t E coli (E. coli) | None | Cannot lead a claim |
| Z2009 | Contact w and exposure to oth intestinal infectious diseases | None | Cannot lead a claim |
| Z201 | Contact with and (suspected) exposure to tuberculosis | None | Cannot lead a claim |
| Z202 | Contact w and exposure to infect w a sexl mode of transmiss | None | Cannot lead a claim |
| Z203 | Contact with and (suspected) exposure to rabies | None | Cannot lead a claim |
| Z204 | Contact with and (suspected) exposure to rubella | None | Cannot lead a claim |
| Z205 | Contact with and (suspected) exposure to viral hepatitis | None | Cannot lead a claim |
| Z206 | Contact w and (suspected) exposure to human immunodef virus | None | Cannot lead a claim |
| Z207 | Cntct w & expsr to pediculosis, acariasis & oth infestations | None | Cannot lead a claim |
| Z20810 | Contact with and (suspected) exposure to anthrax | None | Cannot lead a claim |
| Z20811 | Contact with and (suspected) exposure to meningococcus | None | Cannot lead a claim |
| Z20818 | Contact w and exposure to oth bact communicable diseases | None | Cannot lead a claim |
| Z20820 | Contact with and (suspected) exposure to varicella | None | Cannot lead a claim |
| Z20821 | Contact with and (suspected) exposure to Zika virus | None | Cannot lead a claim |
| Z20822 | Contact with and (suspected) exposure to COVID-19 | K | Can lead a claim |
| Z20828 | Contact w and exposure to oth viral communicable diseases | None | Cannot lead a claim |
| Z2089 | Contact w and exposure to oth communicable diseases | None | Cannot lead a claim |
| Z209 | Contact w and exposure to unsp communicable disease | None | Cannot lead a claim |
| Z21 | Asymptomatic human immunodeficiency virus infection status | None | Cannot lead a claim |
| Z220 | Carrier of typhoid | None | Cannot lead a claim |
| Z221 | Carrier of other intestinal infectious diseases | None | Cannot lead a claim |
| Z222 | Carrier of diphtheria | None | Cannot lead a claim |
| Z2231 | Carrier of bacterial disease due to meningococci | None | Cannot lead a claim |
| Z22321 | Carrier or suspected carrier of methicillin suscep staph | None | Cannot lead a claim |
| Z22322 | Carrier or suspected carrier of methicillin resis staph | None | Cannot lead a claim |
| Z22330 | Carrier of Group B streptococcus | None | Cannot lead a claim |
| Z22338 | Carrier of other streptococcus | None | Cannot lead a claim |
| Z22340 | Carrier of carbapenem-resistant Acinetobacter baumannii | None | Cannot lead a claim |
| Z22341 | Carrier of carbapenem-sensitive Acinetobacter baumannii | None | Cannot lead a claim |
| Z22349 | Carrier of Acinetobacter baumannii, unspecified | None | Cannot lead a claim |
| Z22350 | Carrier of carbapenem-resistant Enterobacterales | None | Cannot lead a claim |
| Z22358 | Carrier of other Enterobacterales | None | Cannot lead a claim |
| Z22359 | Carrier of Enterobacterales, unspecified | None | Cannot lead a claim |
| Z2239 | Carrier of other specified bacterial diseases | None | Cannot lead a claim |
| Z224 | Carrier of infections w sexl mode of transmiss | None | Cannot lead a claim |
| Z226 | Carrier of human T-lymphotropic virus type-1 infection | None | Cannot lead a claim |
| Z227 | Latent tuberculosis | None | Cannot lead a claim |
| Z228 | Carrier of other infectious diseases | None | Cannot lead a claim |
| Z229 | Carrier of infectious disease, unspecified | None | Cannot lead a claim |
| Z23 | Encounter for immunization | None | Cannot lead a claim |
| Z2801 | Immunization not crd out because of acute illness of patient | None | Cannot lead a claim |
| Z2802 | Immuniz not crd out bec chronic illness or cond of patient | None | Cannot lead a claim |
| Z2803 | Immuniz not crd out bec immune compromised state of patient | None | Cannot lead a claim |
| Z2804 | Immuniz not crd out bec patient allergy to vaccine or cmpnt | None | Cannot lead a claim |
| Z2809 | Immunization not carried out because of oth contraindication | None | Cannot lead a claim |
| Z281 | Immuniz not crd out because of patient belief/grp pressr | None | Cannot lead a claim |
| Z2820 | Immuniz not crd out bec patient decision for unsp reason | None | Cannot lead a claim |
| Z2821 | Immunization not carried out because of patient refusal | None | Cannot lead a claim |
| Z2829 | Immuniz not crd out bec patient decision for oth reason | None | Cannot lead a claim |
| Z28310 | Unvaccinated for COVID-19 | None | Cannot lead a claim |
| Z28311 | Partially vaccinated for COVID-19 | None | Cannot lead a claim |
| Z2839 | Other underimmunization status | None | Cannot lead a claim |
| Z2881 | Immuniz not crd out due to patient having had the disease | None | Cannot lead a claim |
| Z2882 | Immunization not carried out because of caregiver refusal | None | Cannot lead a claim |
| Z2883 | Immunization not crd out due to unavailability of vaccine | None | Cannot lead a claim |
| Z2889 | Immunization not carried out for other reason | None | Cannot lead a claim |
| Z289 | Immunization not carried out for unspecified reason | None | Cannot lead a claim |
| Z2911 | Enctr for prphylc immther for resp syncytial virus (RSV) | None | Cannot lead a claim |
| Z2912 | Encounter for prophylactic antivenin | None | Cannot lead a claim |
| Z2913 | Encounter for prophylactic Rho(D) immune globulin | None | Cannot lead a claim |
| Z2914 | Encounter for prophylactic rabies immune globulin | None | Cannot lead a claim |
| Z293 | Encounter for prophylactic fluoride administration | None | Cannot lead a claim |
| Z2981 | Encounter for HIV pre-exposure prophylaxis | None | Cannot lead a claim |
| Z2989 | Encounter for other specified prophylactic measures | None | Cannot lead a claim |
| Z299 | Encounter for prophylactic measures, unspecified | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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