ICDcodes.org
FY2027

Z73.3 — Stress, not elsewhere classified

BillableUnspecified

Is Z73.3 billable?

Yes, but Z73.3 is an unspecified code. Z73.3 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, Z73.3 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting Z73.3 — the more specific alternatives are listed below.

Z73.3 at a glance

CodeZ73.3
DescriptionStress, not elsewhere classified
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

What Medicare edits apply to Z73.3?

The Medicare Code Editor screens inpatient claims before they are grouped. These edits name Z73.3 directly.

Cannot be a principal diagnosis — MCE edit 9

CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.

Which MS-DRGs does Z73.3 group to?

Z73.3 sits in MDC 23 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 951Other Factors Influencing Health Statusmedical

How is Z73.3 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to Z73.3. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Reaction › post-traumatic stress, uncomplicated
  • Strain › mental NOS
  • Strain › physical NOS
  • Strain › psychological NEC
  • Stress › mental NEC
  • Stress › physical NEC

Excludes1 — never code together

The conditions below can never be reported together with Z73.3 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • stress related to employment or unemployment (Z56.-)

Inclusion terms

Alternative wording in documentation that is classified to Z73.3.

  • Physical and mental strain NOS

Excludes2 — not included here — inherited from Z73

The conditions below are not part of Z73.3, but a patient may have both at the same time. When documentation supports it, Z73.3 and the excluded code may both be reported.

  • problems related to socioeconomic and psychosocial circumstances (Z55-Z65)

How long has Z73.3 existed?

Z73.3 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with Z73.3?

ICD-10-CM declares these codes mutually exclusive with Z73.3 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to Z73.3?

What other codes are in the Z73 family? (8)