Z86.51
Personal history of combat and operational stress reaction
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
Conditions classifiable to F40-F59
any follow-up examination after treatment (Z09)
any follow-up examination (Z08-Z09)
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.
Official Guidelines for Z86.51
FY 2026 ›Sections that reference Z86.51
- I.C.1.g.1)(i)Personal history of COVID-19Chapter 1
For patients with a history of COVID-19, assign code Z86.16, Personal history of COVID-19.
- I.C.1.g.1)(j)Follow-up visits after COVID-19 infection has resolvedChapter 1
… codes Z09, Encounter for follow-up examination after completed treatment for conditions other than malignant neoplasm, and Z86.16, Personal history of COVID-19. …
- I.C.21.c.4)History (of)
… Family history of other specific disorders Z84 Family history of other conditions Z85 Personal history of malignant neoplasm Z86 Personal history of certain other diseases Z87 Personal history of other diseases and conditions Z91.4- Personal history of …
- I.C.21.c.14)Nonspecific Z Codes
… for procedure for purposes other than remedying health state, unspecified Z52.9 Donor of unspecified organ or tissue Z86.59 Personal history of other mental and behavioral disorders Z88.9 Allergy status to unspecified drugs, medicaments and …
- I.B.3Code or codes from A00.0 through T88.9, Z00-Z99.8, U00-U85Conventions & general rules
The appropriate code or codes from A00.0 through T88.9, Z00-Z99.8, and U00-U85 must be used to identify diagnoses, symptoms, conditions, problems, complaints or other reason(s) for the …
- I.C.20.a.1)Used with any code in the range of A00.0-T88.9, Z00-Z99Chapter 20
An external cause code may be used with any code in the range of A00.0-T88.9, Z00-Z99, classification that represents a health condition due to an external cause. …
Showing 6 of 10. Search the guidelines for Z86. Sections whose FY 2026 text names Z86.51, its Z86 category, or a range containing it — the chapter guidance above is the authoritative source.
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