What is ICD-10 code M87.232?

M87.232 is the ICD-10-CM diagnosis code for Osteonecrosis due to previous trauma of left radius. Death of bone tissue in the left forearm bone (radius) caused by a previous injury. It belongs to the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99). M87.232 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M87.232 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. M87.232 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. M87.232 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 M87.232 map to under V28?

M87.232 maps to CMS-HCC V28 HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM M87.232: Osteonecrosis due

M87.232 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Documentation must support MEAT. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupM87.232Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other osteopathies (M86-M90)

M87.232

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

Osteonecrosis due to previous trauma of left radius

Death of bone tissue in the left forearm bone (radius) caused by a previous injury.

Buddy Insight

Left radius osteonecrosis following trauma represents a significant functional impairment affecting the dominant side in most patients.

CMS-HCC V28

Mapped

HCC 92

Bone/Joint/Muscle/Severe Soft...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 055

HHS-HCC 055 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 39

Bone/Joint/Muscle Infections/...

Code-level coefficient reference

RXHCC

Mapped

HCC 80

Aseptic Necrosis of Bone

Code-level coefficient reference

Code Book Path

Official

M87.2Osteonecrosis due to previous trauma

M87.23Osteonecrosis due to previous trauma of radius, ulna and carpus

M87.232Osteonecrosis due to previous trauma of left radius

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M87.232 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M87.232 in this effective period.

Related Child Codes

Official

M87.231Osteonecrosis due to previous trauma of right radius

M87.233Osteonecrosis due to previous trauma of unspecified radius

M87.234Osteonecrosis due to previous trauma of right ulna

M87.235Osteonecrosis due to previous trauma of left ulna

M87.236Osteonecrosis due to previous trauma of unspecified ulna

Includes

Official

ICD-10-CM does not list Includes notes for M87.232 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for M87.232 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M87.232 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M87.232 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M87.232 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of previous trauma specifically to the left radius

Radiological evidence of osteonecrosis through appropriate imaging

Clinical assessment showing left forearm/wrist impairment

Exclusion of non-traumatic causes of osteonecrosis

MEAT Support

HCC Buddy guidance

Documentation of previous trauma specifically to the left radius

Radiological evidence of osteonecrosis through appropriate imaging

Clinical assessment showing left forearm/wrist impairment

Exclusion of non-traumatic causes of osteonecrosis

Audit Caution

HCC Buddy guidance

Using acute trauma codes instead of chronic sequelae codes

Confusing laterality when documentation is unclear

Missing the causal relationship documentation

Confusing with infection-related bone changes

Common Mistakes

HCC Buddy guidance

M87.032 — Idiopathic osteonecrosis of left radius (spontaneous, not traumatic)

S52.502A — Unspecified fracture of the lower end of left radius (acute injury)

M86.032 — Acute hematogenous osteomyelitis of left radius (infectious process)

M87.332 — Other secondary osteonecrosis of left radius (non-traumatic secondary)

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 M87.232 an HCC code?

Yes. M87.232 (Osteonecrosis due to previous trauma of left radius) maps to HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.479. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: M87.232 is billable and maps to V28 HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: M87.232
Description: Osteonecrosis due to previous trauma of left radius
HCC (V28): HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
RAF reference coefficient: 0.479
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis

0.479

ESRDHCC 39, Bone/Joint/Muscle Infections/Necrosis

Not separately weighted

RxHCCHCC 80, Aseptic Necrosis of Bone

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. 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 context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work M87.232 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for M87.232

For M87.232 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 M87.232 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M87.232 is the ICD-10-CM diagnosis code for osteonecrosis due to previous trauma of left radius. Death of bone tissue in the left forearm bone (radius) caused by a previous injury. M87.232 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).

Under the CMS-HCC V28 risk adjustment model, M87.232 maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (HCC 92) with a source-labeled community, non-dual, aged reference coefficient of 0.479. No V24 mapping is shown for M87.232; use the applicable model and payment year when reviewing the V28 mapping. 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. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Verify left-sided radius involvement in the clinical documentation. Because M87.232 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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, source-labeled coefficient references, and MEAT documentation criteria for M87.232 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Verify left-sided radius involvement in the clinical documentation
•This condition may result from old fractures or other significant trauma to the forearm

Clinical Significance

Left radius osteonecrosis following trauma represents a significant functional impairment affecting the dominant side in most patients. This condition requires careful monitoring for progression and may necessitate surgical intervention to prevent collapse and preserve wrist function.

Documentation Requirements

✓Documentation of previous trauma specifically to the left radius
✓Radiological evidence of osteonecrosis through appropriate imaging
✓Clinical assessment showing left forearm/wrist impairment
✓Exclusion of non-traumatic causes of osteonecrosis
✓Documentation of pain patterns and functional limitations
✓Provider correlation between past trauma and current bone death
✓Evidence of failed bone healing or revascularization
✓Assessment of impact on activities of daily living

Commonly Confused Codes

•M87.032: Idiopathic osteonecrosis of left radius (spontaneous, not traumatic)
•S52.502A: Unspecified fracture of the lower end of left radius (acute injury)
•M86.032: Acute hematogenous osteomyelitis of left radius (infectious process)
•M87.332: Other secondary osteonecrosis of left radius (non-traumatic secondary)
•M25.532: Pain in left wrist (symptom code only)