What is ICD-10 code M96.639?

M96.639 is the ICD-10-CM diagnosis code for Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm. It belongs to the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99). M96.639 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M96.639 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. M96.639 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. M96.639 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does M96.639 map to under V28?

M96.639 does not map to a CMS-HCC V28 payment category. Check the current CMS-HCC V28 model file for payment year 2026 rather than an older V24 tip sheet.

What does M96.639 pay in RAF?

M96.639 has no separately stated V28 community RAF weight. If it is not a V28 payment HCC, it adds nothing to a community RAF score.

What is the V28 vs V24 difference for M96.639?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. M96.639 was a payment HCC under V24 (Complications of Specified Implanted Device or Graft) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What documentation supports M96.639?

This code is used when the laterality (left/right arm) is not documented; if documented, use M96.631 (right) or M96.632 (left) instead Verify that the fracture occurred as a complication following the orthopedic procedure, not as the original injury being treated Because M96.639 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score. See the MEAT criteria checklist at /meat-criteria for what Monitor, Evaluate, Assess, or Treat looks like in a note. MEAT is generic documentation evidence, not a payer-specific rule.

2026 ICD-10-CM M96.639: Fracture of radius or ulna

M96.639 is not a CMS-HCC payment code. MEAT criteria · RAF calculator · HCC Buddy coding tools

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Code lookupM96.639Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified (M96)

M96.639

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

A fracture of the radius or ulna (forearm bones) that occurs after surgical placement of an orthopedic implant, prosthesis, or bone plate, with the specific arm not identified.

Buddy Insight

Radius or ulna fracture following orthopedic implant insertion in unspecified arm represents a serious postoperative complication requiring specialized orthopedic management.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

Mapped

HCC 176

Complications of Specified Im...

RAF 0.582

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

Mapped

HCC 176

Complications of Specified Im...

RAF 0.000

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

M96.6Fracture of bone following insertion of orthopedic implant, joint prosthesis, or bone plate

M96.63Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate

M96.639Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M96.639 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M96.639 in this effective period.

Related Child Codes

Official

M96.631Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm

M96.632Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, left arm

Includes

Official

ICD-10-CM does not list Includes notes for M96.639 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for M96.639 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M96.639 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M96.639 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M96.639 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of prior orthopedic implant, prosthesis, or bone plate insertion

Confirmation of radius or ulna fracture occurring after implant procedure

Clinical evidence establishing relationship between implant and fracture

Treatment plan addressing both fracture management and implant evaluation

MEAT Support

HCC Buddy guidance

Documentation of prior orthopedic implant, prosthesis, or bone plate insertion

Confirmation of radius or ulna fracture occurring after implant procedure

Clinical evidence establishing relationship between implant and fracture

Treatment plan addressing both fracture management and implant evaluation

Audit Caution

HCC Buddy guidance

Using when laterality is clearly documented but overlooked

Not establishing clear relationship between prior implant and current fracture

Coding routine fractures without considering implant complication aspect

Confusing with mechanical device failure rather than bone fracture complication

Common Mistakes

HCC Buddy guidance

S52.90XA — Fracture of unspecified forearm without implant relationship

M96.631 — Same complication but specifically right arm rather than unspecified

M96.632 — Same complication but specifically left arm rather than unspecified

T84.119A — Breakdown of internal fixation device of unspecified forearm

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is M96.639 an HCC code?

Yes. M96.639 maps to Complications of Specified Implanted Device or Graft under the V24 model but is not retained in V28.

Code: M96.639
Description: Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm
HCC (V28): No CMS-HCC V28 mapping
RAF: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

V24HCC 176, Complications of Specified Implanted Device or Graft

0.582

ESRDHCC 176, Complications of Specified Implanted Device or Graft

0.000

Each model's RAF is its CMS base weight for that model's standard population, so weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

Work M96.639 in the Code Book — tabular path, V28 RAF, and MEAT checklist →

MEAT Criteria for M96.639

For M96.639 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed M96.639 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M96.639 is the ICD-10-CM diagnosis code for fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm. A fracture of the radius or ulna (forearm bones) that occurs after surgical placement of an orthopedic implant, prosthesis, or bone plate, with the specific arm not identified. M96.639 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified (m96).

Under the older CMS-HCC V24 model, M96.639 maps to Complications of Specified Implanted Device or Graft (HCC 176) with a community, non-dual, aged base RAF weight of 0.582. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This code is used when the laterality (left/right arm) is not documented; if documented, use M96.631 (right) or M96.632 (left) instead. Because M96.639 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for M96.639 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This code is used when the laterality (left/right arm) is not documented; if documented, use M96.631 (right) or M96.632 (left) instead
•Verify that the fracture occurred as a complication following the orthopedic procedure, not as the original injury being treated

Clinical Significance

Radius or ulna fracture following orthopedic implant insertion in unspecified arm represents a serious postoperative complication requiring specialized orthopedic management. This diagnosis significantly impacts risk adjustment modeling due to complex care needs, potential revision procedures, and functional limitations affecting upper extremity use.

Documentation Requirements

✓Documentation of prior orthopedic implant, prosthesis, or bone plate insertion
✓Confirmation of radius or ulna fracture occurring after implant procedure
✓Clinical evidence establishing relationship between implant and fracture
✓Treatment plan addressing both fracture management and implant evaluation
✓Assessment of implant integrity and revision surgery considerations
✓Documentation excluding external traumatic causes for fracture
✓Provider statement confirming complication relationship to prior procedure
✓Functional assessment and rehabilitation planning documentation

Commonly Confused Codes

•S52.90XA: Fracture of unspecified forearm without implant relationship
•M96.631: Same complication but specifically right arm rather than unspecified
•M96.632: Same complication but specifically left arm rather than unspecified
•T84.119A: Breakdown of internal fixation device of unspecified forearm
•Z96.64: Presence of other orthopedic joint implants without complications

Child Codes

M96.631Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, right arm

M96.632Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, left arm

M96.639Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

Code Hierarchy

└M96Intraoperative and postprocedural complications and disorders of musculoskeletal system, not elsewhere classified └M96.6Fracture of bone following insertion of orthopedic implant, joint prosthesis, or bone plate └M96.63Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate └M96.639Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

└M96.639Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

M96.639 ICD-10-CM Code: Fracture of radius or ulna following insertion of orthopedic implant, joint prosthesis, or bone plate, unspecified arm

HCC Buddy Code Card

M96.639

Is M96.639 an HCC code?

HCC Category Mapping

MEAT Criteria for M96.639

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What This Code Means

Coding Tips

Clinical Significance

Documentation Requirements

Commonly Confused Codes

Child Codes

Code Hierarchy

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