Z86.73 vs I69: history of stroke with or without deficits

What is the difference between Z86.73 and I69?

Z86.73 (Personal history of transient ischemic attack (TIA), and cerebral infarction without residual deficits) is one billable code in Chapter 21, the Z codes. Its Tabular inclusion terms add “Personal history of prolonged reversible ischemic neurological deficit (PRIND)” and “Personal history of stroke NOS without residual deficits”. Z86.73 records a past event. It does not describe a condition being treated now.

I69- (Sequelae of cerebrovascular disease) is a category, not a billable code. It holds 240 billable codes, and each one names two things: the type of cerebrovascular event and the deficit it left. The subcategory is chosen by the type of event:

I69.3- has 40 of those codes and carries the inclusion term “Sequelae of stroke NOS”. A record that says only “stroke” therefore goes to I69.3-, not to I69.9-.

The choice between Z86.73 and I69 does not depend on how long ago the stroke happened. It depends only on whether the patient has a deficit from that stroke today.

“There is no time limit on when a sequela code can be used.”

What do the Official Guidelines say about Z86.73 and I69?

Section I.C.9.d.1 defines what category I69 captures:

“These “late effects” include neurologic deficits that persist after initial onset of conditions classifiable to categories I60-I67. The neurologic deficits caused by cerebrovascular disease may be present from the onset or may arise at any time after the onset of the condition classifiable to categories I60-I67.”

Section I.C.9.d.3 is headed with both I69 and Z86.73 and draws the line between them:

“Codes from category I69 should not be assigned if the patient does not have neurologic deficits.”

When there is no deficit, the personal history definition in Section I.C.21.c.4 describes what remains, and that is what Z86.73 reports:

“Personal history codes explain a patient’s past medical condition that no longer exists and is not receiving any treatment, but that has the potential for recurrence, and therefore may require continued monitoring.”

The Tabular List enforces the split in both directions, so Z86.73 and an I69 code are never reported together:

• Z86.73 Excludes1: “sequelae of cerebrovascular disease (I69.-)”
• I69- Excludes1: “personal history of cerebral infarction without residual deficit (Z86.73)”
• I69- Excludes1: “personal history of prolonged reversible ischemic neurologic deficit (PRIND) (Z86.73)”
• I69- Excludes1: “personal history of reversible ischemic neurologcial deficit (RIND) (Z86.73)”

The Excludes1 vs Excludes2 guide explains why an Excludes1 note means the two codes can never share a claim.

How do you choose the I69 code for a residual deficit?

• 1. Confirm the deficit. The provider must document a neurologic deficit that is present now and is a residual of the earlier cerebrovascular event. If there is none, use Z86.73 and stop here.
• 2. Pick the subcategory by the type of event. Cerebral infarction, or stroke not further specified, goes to I69.3-. Hemorrhages go to I69.0-, I69.1- or I69.2-.
• 3. Find the deficit in the Alphabetic Index. Look under Sequelae › infarction › cerebral, or under the deficit itself. For example, Aphasia › following › cerebrovascular disease › cerebral infarction leads to I69.320. Then confirm the code in the Tabular List.
• 4. Report one code per deficit. A patient with aphasia and dysphagia gets two I69 codes. Each I69 code already names its deficit, so the separate symptom code is not added:

“An exception to the above guidelines are those instances where the code for the sequela is followed by a manifestation code identified in the Tabular List and title, or the sequela code has been expanded (at the fourth, fifth or sixth character levels) to include the manifestation(s).”

Additional codes are still added when the Tabular List asks for them. The table covers the deficits coders see most often. The history of stroke hub lists every deficit the Index names under cerebral infarction.

5. For hemiplegia, hemiparesis and monoplegia, choose by side and dominance. When the record gives the side but not the dominance, Section I.C.9.d.1 sets the default:

“Codes from category I69, Sequelae of cerebrovascular disease, that specify hemiplegia, hemiparesis and monoplegia identify whether the dominant or nondominant side is affected. Should the affected side be documented, but not specified as dominant or nondominant, and the classification system does not indicate a default, code selection is as follows: • For ambidextrous patients, the default should be dominant. • If the left side is affected, the default is non-dominant. • If the right side is affected, the default is dominant.”

Where does I63 fit in?

I63- (Cerebral infarction) reports a cerebral infarction the patient has now. The Index sends “Stroke” with no other detail to I63.9. Section I.C.18.i calls codes I60-I63 the acute stroke codes:

“The NIH stroke scale (NIHSS) codes (R29.7- -) can be used in conjunction with acute stroke codes (I60-I63) to identify the patient's neurological status and the severity of the stroke.”

An old stroke is not coded to I63. The Index entry Stroke › cerebrovascular › chronic, which carries the nonessential modifiers (old) (remote) (imaging) (without sequelae), leads to Z86.73. An old stroke that left a deficit is coded to I69. The general sequela rule rules out reporting both the acute code and the late-effect code for the same event:

“The code for the acute phase of an illness or injury that led to the sequela is never used with a code for the late effect.”

The I69-with-I63 combination is allowed only when the two codes describe different events: a new stroke now, and deficits from an earlier one.

“Codes from category I69 may be assigned on a health care record with codes from I60-I67, if the patient has a current cerebrovascular disease and deficits from an old cerebrovascular disease.”

I63’s Tabular List Excludes2 note, which permits both codes on one record, lists “chronic, without residual deficits (sequelae) (Z86.73)” and “sequelae of cerebral infarction (I69.3-)”. So Z86.73 or an I69.3- code can appear next to a new I63 code when the record supports it.

Worked examples

What are the most common Z86.73 and I69 errors?

• Using I63 for “history of stroke.” An old stroke is coded to Z86.73 when there is no deficit and to I69 when there is one. It is never coded to I63.
• Reporting Z86.73 with an I69 code. Each code has an Excludes1 note against the other.
• Adding the symptom code. R47.01 with I69.320, or a G81- code with I69.35-, duplicates the deficit, and the Excludes1 notes above forbid it.
• Defaulting to I69.30 (unspecified sequelae) when the record names the deficit.
• Reporting I69.359 when the side is documented. The dominance defaults make the unspecified-side code avoidable. CMS lists I69.359 under Medicare Code Editor edit 20, the unspecified-code edit. See the unspecified codes guide.
• Coding a traumatic brain injury as a stroke. I69 excludes sequelae of traumatic intracranial injury (S06-), and Z86.73 excludes personal history of traumatic brain injury (Z87.820).

Sometimes a note says “history of stroke” but also documents a deficit such as dysphagia without saying what caused it. The record then does not show whether the deficit is a residual of the stroke. Query the provider instead of choosing between Z86.73 and I69.

What should you check before submitting?

• Is a residual deficit documented? If yes, use I69. If no, use Z86.73. Never both.
• Does the I69 subcategory match the type of event? Infarction and stroke not further specified both go to I69.3-.
• Is there one I69 code per deficit, with no symptom code the Tabular List excludes, and with every additional code it asks for (such as the R13.1- type after I69.391)?
• For hemiplegia and monoplegia, is the side documented and the default dominance applied?
• On an inpatient claim, is Z86.73 kept out of the principal position?
• None of the codes in this article was added, expanded, revised or deleted in the FY2027 update. The FY2027 changes page lists what did change.
• Run the final code list through the batch checker to confirm every code is valid and billable for FY2027.