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ICD-10 Coding for MGUS(D47.2)

Complete ICD-10-CM coding and documentation guide for MGUS. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

Monoclonal Gammopathy of Undetermined Significance

Related ICD-10 Code Ranges

Complete code families applicable to MGUS

D47.2Primary Range

Monoclonal gammopathy

Primary code for MGUS, used to identify monoclonal gammopathy without CRAB features.

Multiple myeloma

Used when CRAB features are present, indicating progression to multiple myeloma.

Polyclonal hypergammaglobulinemia

Used when non-monoclonal protein elevation is confirmed.

Key Information: ICD-10 code for MGUS

Essential facts and insights about MGUS

The ICD-10 code for Monoclonal Gammopathy of Undetermined Significance (MGUS) is D47.2.

Primary ICD-10-CM Code for mgus

Monoclonal gammopathy
Billable Code

Decision Criteria

clinical Criteria

  • No CRAB features present

coding Criteria

  • Use D47.2 for MGUS without progression

documentation Criteria

  • Document serum protein levels and absence of CRAB features

Applicable To

  • MGUS

Excludes

Clinical Validation Requirements

  • Serum monoclonal protein <3 g/dL
  • Bone marrow plasma cells <10%
  • Absence of CRAB features

Code-Specific Risks

  • Undercoding if CRAB features are present
  • Overcoding if used for polyclonal conditions

Coding Notes

  • Ensure documentation clearly states absence of CRAB features.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Personal history of other malignant neoplasms of lymphoid/hematopoietic tissues

Z85.79
Use if monitoring for progression from a prior malignancy.

Other specified abnormal findings of blood chemistry

R79.89
Use for abnormal serum free light chains or protein electrophoresis.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Multiple myeloma

C90.0
Presence of CRAB features.

Polyclonal hypergammaglobulinemia

D89.0
Non-monoclonal protein elevation.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting MGUS to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code D47.2.

Impact

Clinical: Misclassification of the condition., Regulatory: Potential audit issues., Financial: Denial of claims due to insufficient documentation.

Mitigation Strategy

Always include specific lab results in documentation.

Impact

Reimbursement: Incorrect DRG assignment can affect reimbursement., Compliance: Non-compliance with coding guidelines., Data Quality: Inaccurate clinical data representation.

Mitigation Strategy

Use C90.0 if CRAB features are present.

Impact

Failure to document absence of CRAB features can lead to incorrect coding.

Mitigation Strategy

Ensure thorough documentation of lab results and clinical findings.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for MGUS, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for MGUS

Use these documentation templates to ensure complete and accurate documentation for MGUS. These templates include all required elements for proper coding and billing.

Asymptomatic MGUS monitoring

Specialty: Hematology

Required Elements

  • Serum protein levels
  • Absence of CRAB features
  • Monitoring plan

Example Documentation

Assessment: MGUS (D47.2): IgG κ, 11 g/L. Monitoring: Stable x 2 years. No CRAB features: Calcium: 9.2 mg/dL, Creatinine: 1.0 mg/dL, Hgb: 14.1 g/dL, Skeletal survey (3/2025): No lytic lesions. Plan: Annual SPEP, sFLC, CBC, metabolic panel.

Examples: Poor vs. Good Documentation

Poor Documentation Example
Elevated protein, monitor MGUS.
Good Documentation Example
IgA λ monoclonal protein 9 g/L; sFLC ratio 0.3 (ref: 0.26–1.65); no lytic lesions on imaging; no anemia (Hgb 13.2 g/dL).
Explanation
The good example includes specific lab values and absence of CRAB features, providing a complete clinical picture.

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