2026 ICD-10-CM Diagnosis Code N99.843Postprocedural seroma of a genitourinary system organ or structure following other procedure

ICD-10-CM Codes›N00–N99›N99›N99

ICD-10-CM N99.843
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N99.843 is a billable ICD-10-CM diagnosis code for postprocedural seroma of a genitourinary system organ or structure following other procedure. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 919 through 921. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative genitourinary system complication.

Code Identity

ICD-10-CM Code
N99.843
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural seroma of a genitourinary system organ or structure following other procedure
Short Description
Postproc seroma of a GU sys org following other procedure
Parent Code
N99.84
Postprocedural hematoma and seroma of a genitourinary system organ or structure following a procedure

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
CategoryN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
This CodeN99.843Postprocedural seroma of a genitourinary system organ or structure following other procedure

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.

    • Complication(s) (from) (of)
      • postprocedural
        • seroma (of)
          • genitourinary organ or structure
            • following procedure on other organ

Clinical ClassificationClinical

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

CCSR GEN026
Postprocedural or postoperative genitourinary system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert N99.843 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 N99.843 replaces the following previously assigned code(s):

  • N99.821 - Postproc hemor of a GU sys org following other procedure
  • N99.821 - Postproc hemor/hemtom of a GU sys org fol oth procedure
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N99.843Overview

Is N99.843 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report postprocedural seroma of a genitourinary system organ or structure following other procedure on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N99.843 group to?

When postprocedural seroma of a genitourinary system organ or structure following other procedure is the principal diagnosis on an inpatient stay, it groups to MS-DRG 919, 920, 921, with relative weights from 0.6884 to 1.8308 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N99.843?

Under the General Equivalence Mappings, postprocedural seroma of a genitourinary system organ or structure following other procedure converts to ICD-9-CM 998.13 (seroma complicting proc). 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.