Abridge Upgrade & Migration

Overview

Procedures for upgrading Abridge API integrations and migrating between EHR systems. Healthcare migrations are high-risk — clinical documentation cannot have gaps.

Common Migration Scenarios

Scenario	Complexity	Downtime	Risk
API version bump (v1 → v2)	Medium	Zero (dual-version)	Low
EHR migration (Epic → Athena)	High	Planned window	High
New specialty onboarding	Low	Zero	Low
Note template changes	Medium	Zero	Medium
Multi-site rollout	High	Per-site windows	Medium

Prerequisites

• A change record that names clinical, EHR, security, and operations owners, a maintenance window, and the reversible cutover point.
• Verified source and target sandbox access, approved synthetic fixtures, and a documented manual-documentation fallback for every affected provider.
• An immutable baseline of templates, adapter behavior, and aggregate quality metrics so the parallel-run comparison has a known reference.

Instructions

Step 1: API Version Migration

// src/migration/api-version-adapter.ts
// Dual-version adapter for zero-downtime API upgrades

interface ApiVersionConfig {
  v1BaseUrl: string;  // Current production
  v2BaseUrl: string;  // New version (canary)
  canaryPercent: number;  // Percentage of traffic to v2
}

class AbridgeVersionAdapter {
  constructor(private config: ApiVersionConfig) {}

  getBaseUrl(): string {
    // Gradual canary rollout
    const useV2 = Math.random() * 100 < this.config.canaryPercent;
    return useV2 ? this.config.v2BaseUrl : this.config.v1BaseUrl;
  }

  // Map v1 response to v2 format (or vice versa)
  normalizeNoteResponse(response: any, version: 'v1' | 'v2'): any {
    if (version === 'v1') {
      return {
        ...response,
        // v2 adds quality_metrics — provide defaults for v1
        quality_metrics: response.quality_metrics || {
          confidence_score: response.confidence || 0,
          completeness_score: 0,
          coding_accuracy: 0,
        },
      };
    }
    return response;
  }
}

Step 2: EHR Migration Procedure

// src/migration/ehr-migration.ts
interface EhrMigrationPlan {
  sourceEhr: 'epic' | 'athena' | 'cerner' | 'eclinicalworks';
  targetEhr: 'epic' | 'athena' | 'cerner' | 'eclinicalworks';
  migrationDate: Date;
  providerCount: number;
  steps: MigrationStep[];
}

interface MigrationStep {
  order: number;
  name: string;
  description: string;
  rollbackable: boolean;
  estimatedMinutes: number;
}

function generateMigrationPlan(source: string, target: string): EhrMigrationPlan {
  return {
    sourceEhr: source as any,
    targetEhr: target as any,
    migrationDate: new Date(),
    providerCount: 0, // Set per org
    steps: [
      { order: 1, name: 'Freeze new enrollments', description: 'Stop new provider enrollments on source EHR', rollbackable: true, estimatedMinutes: 5 },
      { order: 2, name: 'Export note templates', description: 'Export all custom note templates and SmartPhrases', rollbackable: true, estimatedMinutes: 30 },
      { order: 3, name: 'Configure target EHR', description: 'Set up FHIR endpoints and OAuth for target EHR', rollbackable: true, estimatedMinutes: 60 },
      { order: 4, name: 'Parallel run', description: 'Run both EHRs for 1 week — compare note output', rollbackable: true, estimatedMinutes: 10080 },
      { order: 5, name: 'Provider re-enrollment', description: 'Re-enroll providers on target EHR', rollbackable: true, estimatedMinutes: 120 },
      { order: 6, name: 'Cutover', description: 'Switch primary EHR integration to target', rollbackable: true, estimatedMinutes: 15 },
      { order: 7, name: 'Decommission source', description: 'Disable source EHR integration after 30-day soak', rollbackable: false, estimatedMinutes: 30 },
    ],
  };
}

Step 3: Note Template Migration

// src/migration/template-migration.ts
interface NoteTemplate {
  id: string;
  name: string;
  specialty: string;
  sections: string[];
  smartPhrases: Record<string, string>;  // Epic-specific
}

async function migrateTemplates(
  sourceApi: any,
  targetApi: any,
): Promise<{ migrated: number; failed: string[] }> {
  const { data: templates } = await sourceApi.get('/note-templates');
  const failed: string[] = [];
  let migrated = 0;

  for (const template of templates) {
    try {
      // Remove EHR-specific fields
      const { smartPhrases, ...portable } = template;

      await targetApi.post('/note-templates', {
        ...portable,
        // Map SmartPhrases to target EHR equivalent if applicable
      });
      migrated++;
    } catch (err) {
      failed.push(template.id);
    }
  }

  return { migrated, failed };
}

Rollback Procedures

#!/bin/bash
# scripts/abridge-migration-rollback.sh

echo "=== Migration Rollback ==="
echo "Step 1: Revert FHIR endpoint to source EHR"
echo "Step 2: Re-enable source EHR Abridge module"
echo "Step 3: Notify providers of rollback"
echo "Step 4: Verify note generation on source EHR"
echo "=== Rollback Complete ==="

Output

• Dual-version API adapter for zero-downtime upgrades
• EHR migration plan with parallel run validation
• Note template migration with rollback
• Provider re-enrollment procedure

Examples

For an API-version rehearsal, set the v2 canary percentage to zero in the sandbox, replay a synthetic encounter fixture through both response mappers, and compare the resulting normalized fields and FHIR validation outcomes. Increase the canary only after the recorded comparison has no clinical or interoperability regression and the rollback operator confirms the old endpoint is still routable. If a template mapping or target authorization fails during parallel run, keep production traffic on the source integration, preserve the redacted failure receipt, and correct the adapter before rescheduling cutover.

Error Handling

Error	Cause	Solution
Template incompatible	EHR-specific fields	Strip EHR-specific data before migration
Provider enrollment fails	Credentials not migrated	Re-issue provider credentials on target
Note format mismatch	Different FHIR profiles	Map FHIR profiles between EHR systems

Resources

• Abridge Platform
• HL7 FHIR Migration Guide

Next Steps

For CI/CD pipeline setup, see abridge-ci-integration.