ICD-10 · PDGM grouping
Z20 Contact with and (suspected) exposure to communicable diseases
All 18 codes in the Z20 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
18
Can lead a claim
1
Cannot lead a claim
17
What CMS assigns to Z20
1 of the 18 codes groups to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases; 17 are assigned no clinical group. None of the 18 is assigned a comorbidity subgroup. 1 of the 18 can lead a claim.
Every code in Z20
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| Z20.0 Contact with and (suspected) exposure to intestinal infectious diseases | ||||
| Z20.01 | Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)CMS: Cntct w and expsr to intestnl infct dis d/t E coli (E. coli) | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.09 | Contact with and (suspected) exposure to other intestinal infectious diseasesCMS: Contact w and exposure to oth intestinal infectious diseases | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.1 | Contact with and (suspected) exposure to tuberculosis | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.2 | Contact with and (suspected) exposure to infections with a predominantly sexual mode of transmissionCMS: Contact w and exposure to infect w a sexl mode of transmiss | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.3 | Contact with and (suspected) exposure to rabies | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.4 | Contact with and (suspected) exposure to rubella | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.5 | Contact with and (suspected) exposure to viral hepatitis | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.6 | Contact with and (suspected) exposure to human immunodeficiency virus [HIV]CMS: Contact w and (suspected) exposure to human immunodef virus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.7 | Contact with and (suspected) exposure to pediculosis, acariasis and other infestationsCMS: Cntct w & expsr to pediculosis, acariasis & oth infestations | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.8 Contact with and (suspected) exposure to other communicable diseases | ||||
| Z20.81 Contact with and (suspected) exposure to other bacterial communicable diseases | ||||
| Z20.810 | Contact with and (suspected) exposure to anthrax | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.811 | Contact with and (suspected) exposure to meningococcus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.818 | Contact with and (suspected) exposure to other bacterial communicable diseasesCMS: Contact w and exposure to oth bact communicable diseases | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.82 Contact with and (suspected) exposure to other viral communicable diseases | ||||
| Z20.820 | Contact with and (suspected) exposure to varicella | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.821 | Contact with and (suspected) exposure to Zika virus | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.822 | Contact with and (suspected) exposure to COVID-19 | Can lead a claim | K | None |
| Z20.828 | Contact with and (suspected) exposure to other viral communicable diseasesCMS: Contact w and exposure to oth viral communicable diseases | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.89 | Contact with and (suspected) exposure to other communicable diseasesCMS: Contact w and exposure to oth communicable diseases | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| Z20.9 | Contact with and (suspected) exposure to unspecified communicable diseaseCMS: Contact w and exposure to unsp communicable disease | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. 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.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue