2027 ICD-10-CM Diagnosis Code M96.0Pseudarthrosis after fusion or arthrodesis
ICD-10-CM Codes›M00–M99›M96›M96
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 559 through 561. 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 1 closely related codes. 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
Code Classification
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
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M96.0: its own notes plus those printed at M96 and Chapter 13. 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.
- arthropathic psoriasis (L40.5-)
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- compartment syndrome (traumatic) (T79.A-)
- 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)
Notes
General instructions on how these codes are used.
- Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name M96.0, its category, or a range that includes it.
Excludes1 3
These codes carry an Excludes1 note naming M96.0: they are not reported together with it, unless the two conditions are unrelated.
- M40 Kyphosis and lordosispostprocedural kyphosis and lordosis (M96.-) names M96.-, which includes this code
- Block M86-M90 Other osteopathiespostprocedural osteopathies (M96.-) names M96.-, which includes this code
- Block M91-M94 Chondropathiespostprocedural chondropathies (M96.-) names M96.-, which includes this code
Excludes2 4
These codes carry an Excludes2 note naming M96.0: its condition is not part of those codes, and both may be reported when the patient has both.
- M43.2 Fusion of spinepseudoarthrosis after fusion or arthrodesis (M96.0)
- M95 Other acquired deformities of musculoskeletal system and connective tissuepostprocedural musculoskeletal disorders (M96.-) names M96.-, which includes this code
- Block T80-T88 Complications of surgical and medical care, not elsewhere classifiedintraoperative and postprocedural complications of specified body systems (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95.6-, J95.7, K91.6-, L76.-, M96.-, N99.-) names M96.-, which includes this code
- T81 Complications of procedures, not elsewhere classifiedintraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-) names M96.-, which includes this code
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
musculoskeletal system See Also: Complication, intraoperative (intraprocedural), by site;
orthopedic See Also: Disorder, soft tissue;
Pseudarthrosis, pseudoarthrosis (bone) See: Nonunion, fracture;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Convert M96.0 to ICD-9-CMHistory
Code HistoryHistory
Questions About M96.0Overview
What is the ICD-10 code for pseudarthrosis after fusion or arthrodesis?
The ICD-10-CM code for pseudarthrosis after fusion or arthrodesis is M96.0 (sometimes written as M960). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
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, 2026 through September 30, 2027.
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, 561, 560, with relative weights from 0.8258 to 1.8087 depending on complications. Higher weights mean higher Medicare reimbursement.
Is M96.0 a CC or MCC?
CMS lists M96.0 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 1 closely related codes in its exclusion list.
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.
