Z86.17UpcomingBillable / specificExempt from present-on-admission reporting

Personal history of Clostridioides difficile infection

Code-level instructions

Excludes 1

enterocolitis due to Clostridium difficile, recurrent (A04.71)

Z86 · Inherited instructions

Code first

any follow-up examination after treatment (Z09)

Z77-Z99 · Inherited instructions

Code also

any follow-up examination (Z08-Z09)

Z86.1 · Inherited instructions

Excludes 1

personal history of infectious diseases specific to a body system
sequelae of infectious and parasitic diseases (B90-B94)

Claims & coverage

Coverage depends on the payer, service and applicable policy. A billable code does not guarantee payment.

When ICD-10-CM is required

For US diagnosis claims covered by HIPAA, ICD-10-CM is required from October 1, 2015.

Use the service date for outpatient/professional claims and the discharge date for hospital inpatient claims. Earlier encounters use ICD-9-CM; each individual code must also be valid for the applicable date.

Official coding guidelines → · CMS ↗

Check Medicare coverage ↗

First observed · 2026-10-01

Code history

Latest recorded change · FY2027

ChangedUnchanged

FY2027UpcomingSelected edition

Effective from 2026-10-01

Added

Personal history of Clostridioides difficile infection

Billable diagnosis code

CDC/NCHS · FY2027

All editions (1)

All editions	Effective from	Code history
FY2027	2026-10-01	Added

Code-level instructions

Inclusion terms

Personal history of Clostridium difficile colitis (fulminant) (nonfulminant)
Personal history of foodborne intoxication by Clostridium difficile
Personal history of Pseudomembraneous colitis

Excludes 1

enterocolitis due to Clostridium difficile, recurrent (A04.71)

Inherited instructions

Z86 · Personal history of certain other diseases

Code first

any follow-up examination after treatment (Z09)

Chapters 21 · Factors influencing health status and contact with health services (Z00-Z99)

Note

Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
(a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
(b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

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

Code also

any follow-up examination (Z08-Z09)

Z86.1 · Personal history of infectious and parasitic diseases

Inclusion terms

Conditions classifiable to A00-B89, B99

Excludes 1

personal history of infectious diseases specific to a body system
sequelae of infectious and parasitic diseases (B90-B94)

Official index references (5)

History (5)

Official conversion history

Historical assignments from the CDC conversion table support data retrieval. They do not authorize substituting a previous code for the current code.

Release dates 2026-10-01

Previous assignment: Z86.19

Related codes

Other entries in the same category; these are not automatic substitutes.

Code	Description	Category · further specificity required
Z86.11	Personal history of tuberculosis	Billable / specific
Z86.12	Personal history of poliomyelitis	Billable / specific
Z86.13	Personal history of malaria	Billable / specific
Z86.14	Personal history of Methicillin resistant Staphylococcus aureus infection	Billable / specific
Z86.15	Personal history of latent tuberculosis infection	Billable / specific
Z86.16	Personal history of COVID-19	Billable / specific
Z86.19	Personal history of other infectious and parasitic diseases	Billable / specific

Official titles and instructions are preserved in their source language. Official sources ↗