2026 ICD-10-CM Diagnosis Code M96.843Postprocedural seroma of a musculoskeletal structure following other procedure

ICD-10-CM Codes›M00–M99›M96›M96

ICD-10-CM M96.843
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M96.843 is a billable ICD-10-CM diagnosis code for postprocedural seroma of a musculoskeletal 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 musculoskeletal system complication.

Code Identity

ICD-10-CM Code
M96.843
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural seroma of a musculoskeletal structure following other procedure
Short Description
Postproc seroma of a ms structure following other procedure
Parent Code
M96.84
Postprocedural hematoma and seroma of a musculoskeletal structure following a procedure

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
CategoryM96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified
This CodeM96.843Postprocedural seroma of a musculoskeletal 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)
          • musculoskeletal structure
            • following non-orthopedic surgery

Clinical ClassificationClinical

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

CCSR MUS037
Postprocedural or postoperative musculoskeletal system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert M96.843 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 M96.843 replaces the following previously assigned code(s):

  • M96.831 - Postproc hemor of a ms structure following other procedure
  • M96.831 - Postproc hemor/hemtom of a ms structure 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 M96.843Overview

Is M96.843 a billable code?

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

What MS-DRG does M96.843 group to?

When postprocedural seroma of a musculoskeletal 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 M96.843?

Under the General Equivalence Mappings, postprocedural seroma of a musculoskeletal 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.