Clinical Scorecard: Coding Guidelines for Wet AMD

At a Glance

Key Highlights

• ICD-10-CM codes for wet AMD require specifying laterality and disease stage using a seventh digit.
• Accurate documentation including diagnostic imaging and medical necessity is essential to avoid claim denials.
• Prior authorization is often required by payors and must include correct diagnosis codes supported by documentation.

Guideline-Based Recommendations

Diagnosis

• Use specific ICD-10-CM codes for wet AMD based on eye laterality: H35.321 (right), H35.322 (left), H35.323 (bilateral), H35.329 (unspecified).
• Add a seventh digit to indicate disease stage: 0 (unspecified), 1 (active choroidal neovascularization), 2 (inactive with involuted neovascularization), 3 (inactive scar).
• Code each eye separately if stages differ; use bilateral code only if both eyes have the same stage.

Management

• Include detailed notes on disease stage and treatment response for each eye in medical records.
• Document diagnostic imaging results (e.g., retinal OCT, OCT-A) to support diagnosis and treatment decisions.

Monitoring & Follow-up

• Ensure documentation reflects current disease activity and response to treatment to justify ongoing care.
• Monitor for suboptimal drug response and document accordingly to support treatment adjustments.

Risks

• Claim denials due to missing or incorrect diagnosis codes or modifiers for laterality.
• Denials from incomplete documentation of medical necessity or conflicting clinical information.
• Failure to obtain prior authorization or follow payor-specific treatment failure criteria.

Patient & Prescribing Data

Patients with exudative age-related macular degeneration receiving treatment

Documentation must demonstrate medical necessity for each injection or procedure and reflect treatment efficacy or failure as required by payors.

Clinical Best Practices

• Code to the highest specificity including laterality and disease stage to ensure compliance and prompt payment.
• Maintain thorough and consistent documentation including exam findings, diagnostic imaging, and treatment rationale.
• Verify prior authorization requirements and submit requests with accurate diagnosis codes supported by clinical documentation.
• Avoid conflicting information in medical records to reduce claim denials.
• Educate all clinical and billing staff on coding and documentation standards for wet AMD.

References

• Centers for Medicare & Medicaid Services. ICD-10