2026 ICD-10-CM Diagnosis Code M96.0Pseudarthrosis after fusion or arthrodesis

ICD-10-CM Codes›M00–M99›M96›M96

ICD-10-CM M96.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M96.0 is a billable ICD-10-CM diagnosis code for pseudarthrosis after fusion or arthrodesis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 559 through 561. Coders also document this condition as nonunion following arthrodesis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified bone disease and musculoskeletal deformities and Postprocedural or postoperative musculoskeletal system complication.

Code Identity

ICD-10-CM Code
M96.0
Billable Status
Yes — Valid for Submission
Code Describes
Pseudarthrosis after fusion or arthrodesis
Short Description
Pseudarthrosis after fusion or arthrodesis
Same as the full description in the CMS dataset.
Parent Code
M96
Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified

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 CodeM96.0Pseudarthrosis after fusion or arthrodesis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Nonunion following arthrodesis
  • Nonunion of fracture
  • Pseudarthrosis after fusion or arthrodesis
  • Pseudarthrosis following spinal fusion

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)
      • musculoskeletal system
        • postoperative (postprocedural)
          • pseudarthrosis
    • Complication(s) (from) (of)
      • orthopedic
        • postprocedural
          • pseudarthrosis post-fusion
    • Nonunion
      • joint, following fusion or arthrodesis
    • Pseudarthrosis, pseudoarthrosis(bone)
      • joint, following fusion or arthrodesis

Clinical ClassificationClinical

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

CCSR MUS028
Other specified bone disease and musculoskeletal deformities
Default principal diagnosis: inpatient No · outpatient No
CCSR MUS037
Postprocedural or postoperative musculoskeletal system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert M96.0 to ICD-9-CMHistory

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

ICD-9-CM
996.49 Mech com orth dev NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
V45.4 Arthrodesis status
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 M96.0Overview

Is M96.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report pseudarthrosis after fusion or arthrodesis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M96.0 group to?

When pseudarthrosis after fusion or arthrodesis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 559, 560, 561, with relative weights from 0.8039 to 1.8649 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of M96.0?

Under the General Equivalence Mappings, pseudarthrosis after fusion or arthrodesis converts to ICD-9-CM 996.49 (mech com orth dev NEC) and V45.4 (arthrodesis status). 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.