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Z20.01

Z20.01Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)

Billable / specific codeICD-10-CM

Z20.01 is a billable, specific ICD-10-CM code for contact with and (suspected) exposure to intestinal infectious diseases due to escherichia coli (e. coli). It is valid for submission on a claim.

Risk adjustment

Z20.01 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

How Z20.01 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z20.01.

  • ContactEscherichia coli(E. coli)
  • ExposureEscherichia coli(E. coli)
  • Contactintestinal infectious disease NECEscherichia coli(E. coli)
  • Exposureintestinal infectious disease NECEscherichia coli(E. coli)

Related codes at this level

Codes that share Z20.0. If Z20.01 is not quite right, the correct code is usually one of these.

Questions about Z20.01

Is Z20.01 a billable ICD-10-CM code?
Yes. Z20.01 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does Z20.01 sit in the tabular list?
Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to communicable diseases (Z20-Z29).
ICD-10-CMFY2026-Apr· effective April 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release — see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.