What is ICD-10 code M83.4?

M83.4 is the ICD-10-CM diagnosis code for Aluminum bone disease. A bone disease caused by aluminum accumulation in the body, leading to weak and soft bones similar to rickets. It belongs to the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99). M83.4 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. M83.4 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. M83.4 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. M83.4 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 M83.4 map to under V28?

M83.4 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for M83.4?

M83.4 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for M83.4?

M83.4 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports M83.4?

Document the source of aluminum exposure (dialysis, occupational, or other) Link to underlying conditions such as chronic kidney disease or long-term dialysis when applicable M83.4 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM M83.4: Aluminum bone disease

M83.4 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

ICD-10-CM Code View

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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupM83.4Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Disorders of bone density and structure (M80-M85)

M83.4

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

Aluminum bone disease

A bone disease caused by aluminum accumulation in the body, leading to weak and soft bones similar to rickets.

Buddy Insight

Aluminum bone disease represents bone softening and dysfunction due to aluminum accumulation, typically seen in chronic kidney disease patients on dialysis or with occupational exposure.

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

Mapped

HCC 87

Osteoporosis, Vertebral and P...

Code-level coefficient reference

Code Book Path

Official

M83Adult osteomalacia

M83.4Aluminum bone disease

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for M83.4 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for M83.4 in this effective period.

Related Child Codes

Official

M83.0Puerperal osteomalacia

M83.1Senile osteomalacia

M83.2Adult osteomalacia due to malabsorption

M83.3Adult osteomalacia due to malnutrition

M83.5Other drug-induced osteomalacia in adults

Includes

Official

ICD-10-CM does not list Includes notes for M83.4 in this effective period.

Excludes 1

Official

infantile and juvenile osteomalacia (E55.0)
renal osteodystrophy (N25.0)
rickets (active) (E55.0)
rickets (active) sequelae (E64.3)
vitamin D-resistant osteomalacia (E83.31)

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for M83.4 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for M83.4 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for M83.4 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of bone disease related to aluminum accumulation

Clinical or radiographic evidence of aluminum bone disease

Laboratory evidence of elevated aluminum levels when available

History of aluminum exposure (dialysis, occupational, environmental)

MEAT Support

HCC Buddy guidance

Documentation of bone disease related to aluminum accumulation

Clinical or radiographic evidence of aluminum bone disease

Laboratory evidence of elevated aluminum levels when available

History of aluminum exposure (dialysis, occupational, environmental)

Audit Caution

HCC Buddy guidance

Using for other drug-induced bone disease

Confusing with general renal osteodystrophy

Missing the specific aluminum etiology

Using for acute aluminum poisoning rather than chronic disease

Common Mistakes

HCC Buddy guidance

M835 — Other drug-induced osteomalacia (other medications)

N25.0 — Renal osteodystrophy (kidney disease bone changes)

M83.8 — Other adult osteomalacia (unspecified causes)

T56.891A — Toxic effect of aluminum (acute poisoning)

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 M83.4 an HCC code?

M83.4 is not in the CMS-HCC V28 or V24 community payment model, but it does map to Osteoporosis, Vertebral and Pathological Fractures under the Part D RxHCC model.

Code: M83.4
Description: Aluminum bone disease
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

RxHCCHCC 87, Osteoporosis, Vertebral and Pathological Fractures

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 M83.4 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT Criteria for M83.4

For M83.4 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 M83.4 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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What This Code Means

M83.4 is the ICD-10-CM diagnosis code for aluminum bone disease. A bone disease caused by aluminum accumulation in the body, leading to weak and soft bones similar to rickets. M83.4 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering disorders of bone density and structure (m80-m85).

M83.4 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28, V24, ESRD, or RxHCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.

This code does not map to a CMS-HCC V28 payment category. Capture depends on documentation that supports the diagnosis; verify the HCC assignment against the current CMS mapping for the applicable payment year. Coders reviewing M83.4 should check whether additional documentation would support a more specific child code in the same hierarchy that has a current source-backed HCC mapping. Code only the specificity supported by the provider documentation.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M83.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the source of aluminum exposure (dialysis, occupational, or other)
•Link to underlying conditions such as chronic kidney disease or long-term dialysis when applicable

Clinical Significance

Aluminum bone disease represents bone softening and dysfunction due to aluminum accumulation, typically seen in chronic kidney disease patients on dialysis or with occupational exposure. This diagnosis indicates complex metabolic bone disease requiring specialized nephrology care and aluminum chelation therapy.