2026 ICD-10-CM Diagnosis Code I97.791Other intraoperative cardiac functional disturbances during other surgery

ICD-10-CM Codes›I00–I99›I95-I99›I97

ICD-10-CM I97.791
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I97.791 is a billable ICD-10-CM diagnosis code for other intraoperative cardiac functional disturbances during other surgery. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 60 closely related codes. Coders also document this condition as acute myocardial infarction during procedure. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative circulatory system complication.

Code Identity

ICD-10-CM Code
I97.791
Billable Status
Yes — Valid for Submission
Code Describes
Other intraoperative cardiac functional disturbances during other surgery
Short Description
Oth intraop cardiac functional disturb during oth surgery
Parent Code
I97.79
Other intraoperative cardiac functional disturbances

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 CodeI97.791Other intraoperative cardiac functional disturbances during other surgery

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute myocardial infarction during procedure
  • Arrhythmia during surgery
  • Myocardial ischemia during surgery

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

CCSR CIR038
Postprocedural or postoperative circulatory system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert I97.791 to ICD-9-CMHistory

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

ICD-9-CM
997.1 Surg compl-heart
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 I97.791Overview

Is I97.791 (Other intraoperative cardiac functional disturbances) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other intraoperative cardiac functional disturbances during other surgery on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I97.791 group to?

When other intraoperative cardiac functional disturbances during other surgery is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, 791, 793, with relative weights from 0.6821 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I97.791 a CC or MCC?

CMS lists I97.791 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 60 closely related codes in its exclusion list.

What is the ICD-9 equivalent of I97.791?

Under the General Equivalence Mappings, other intraoperative cardiac functional disturbances during other surgery converts to ICD-9-CM 997.1 (surg compl-heart). The mapping is approximate, so confirm the match fits the documentation.