2026 ICD-10-CM Diagnosis Code I97.821Postprocedural cerebrovascular infarction following other surgery

ICD-10-CM Codes›I00–I99›I95-I99›I97

ICD-10-CM I97.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I97.821 is a billable ICD-10-CM diagnosis code for postprocedural cerebrovascular infarction following other surgery. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Cerebral infarction and Postprocedural or postoperative circulatory system complication.

Code Identity

ICD-10-CM Code
I97.821
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural cerebrovascular infarction following other surgery
Short Description
Postprocedural cerebvasc infarction following other surgery
Parent Code
I97.82
Postprocedural cerebrovascular infarction

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI95-I99Other and unspecified disorders of the circulatory system
CategoryI97Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified
This CodeI97.821Postprocedural cerebrovascular infarction following other surgery

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Infarct, infarction
      • cerebral (acute)
        • postprocedural
          • following other surgery
    • Stroke(apoplectic) (brain) (ischemic) (paralytic)
      • postprocedural
        • following other surgery

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR020
Cerebral infarction
Default principal diagnosis: inpatient No · outpatient No
CCSR CIR038
Postprocedural or postoperative circulatory system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert I97.821 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
997.02 Iatrogen CV infarc/hmrhg
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I97.821Overview

Is I97.821 (Postprocedural cerebrovascular infarction) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural cerebrovascular infarction following other surgery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of I97.821?

Under the General Equivalence Mappings, postprocedural cerebrovascular infarction following other surgery converts to ICD-9-CM 997.02 (iatrogen CV infarc/hmrhg). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.