2027 ICD-10-CM Diagnosis Code I97.641Postprocedural seroma of a circulatory system organ or structure following cardiac bypass

ICD-10-CM Codes›I00–I99›I95-I99›I97

ICD-10-CM I97.641
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

I97.641 is a billable ICD-10-CM diagnosis code for postprocedural seroma of a circulatory system organ or structure following cardiac bypass. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 919 through 921. 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 84 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative circulatory system complication.

Code Identity

ICD-10-CM Code
I97.641
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural seroma of a circulatory system organ or structure following cardiac bypass
Short Description
Postproc seroma of a circ sys org following cardiac bypass
Parent Code
I97.64
Postprocedural seroma of a circulatory system organ or structure following a circulatory system procedure

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 CodeI97.641Postprocedural seroma of a circulatory system organ or structure following cardiac bypass

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I97.641: its own notes plus those printed at I97.6, I97, and Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From I97.6 Postprocedural hemorrhage, hematoma and seroma of a circulatory system organ or structure following a procedure applies to 12 codes
  • postprocedural cerebrovascular hemorrhage complicating a procedure (G97.5-)
From I97 Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified applies to 39 codes
From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

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 I97.641 to ICD-9-CMHistory

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

ICD-9-CM
998.13 Seroma complicting proc
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement I97.641 replaces the following previously assigned code(s):

  • I97.611 - Postproc hemor of a circ sys org following cardiac bypass
  • I97.611 - Postproc hemor/hemtom of a circ sys org fol cardiac bypass
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I97.641Overview

Is I97.641 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural seroma of a circulatory system organ or structure following cardiac bypass on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does I97.641 group to?

When postprocedural seroma of a circulatory system organ or structure following cardiac bypass is the principal diagnosis on an inpatient stay, it groups to MS-DRG 920, 919, 921, with relative weights from 0.6719 to 1.7624 depending on complications. Higher weights mean higher Medicare reimbursement.

Is I97.641 a CC or MCC?

CMS lists I97.641 as a CC (complication or comorbidity) for FY 2027. 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 84 closely related codes in its exclusion list.

What is the ICD-9 equivalent of I97.641?

Under the General Equivalence Mappings, postprocedural seroma of a circulatory system organ or structure following cardiac bypass converts to ICD-9-CM 998.13 (seroma complicting proc). The mapping is approximate, so confirm the match fits the documentation.