Prior Authorization API Vendor Checklist for 2027
Use this prior authorization API vendor checklist to evaluate CMS scope, FHIR and X12 architecture, CRD, DTR, PAS, identity, testing, workflow ownership, exceptions, evidence, cost, and production readiness.
On this page: Direct answer
Direct answer
Prior authorization API vendor checklist: what operators need to know
Use this prior authorization API vendor checklist to evaluate CMS scope, FHIR and X12 architecture, CRD, DTR, PAS, identity, testing, workflow ownership, exceptions, evidence, cost, and production readiness. Validate regulatory and payer scope before comparing vendor coverage claims. Record every standard, implementation guide, profile, extension, value set, and version.
A prior authorization API vendor checklist should test more than a FHIR logo or connection count. For the 2027 transition, buyers need to establish payer and service scope, current standards and implementation-guide versions, EHR responsibility, CRD requirement discovery, DTR documentation work, PAS submission and response, X12 boundaries, identity, security, production support, fallback, and measurable workflow outcomes.
CMS requirements apply to defined impacted payers and dates, while provider systems, payer readiness, services, drugs, state rules, and existing channels vary. Verify current implementation materials, then require the vendor to demonstrate the exact workflow and failures your team must operate. Trial-use guides can change; version and regression control are core requirements.
Key takeaways
The short version
- Validate regulatory and payer scope before comparing vendor coverage claims.
- Record every standard, implementation guide, profile, extension, value set, and version.
- Test CRD, DTR, and PAS as an operational journey, not isolated endpoints.
- Assign identity, mapping, clinical review, reconciliation, support, fallback, and change ownership contractually.
- Require conformance evidence and representative production scenarios before expansion.
Take the template with you
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Use this during RFI, architecture review, demonstrations, contracting, testing, and production acceptance.
# Prior authorization API vendor checklist ## Scope and proof - Payers / products / services / environments / live status: - CMS source and date for each cohort: ## Standards - FHIR / US Core / SMART / CDS Hooks versions: - CRD / DTR / PAS versions, profiles, operations, extensions, terminology: - X12, attachment, intermediary, and mapping responsibilities: ## Acceptance - Source provenance and human review: - Submission / acknowledgment / inquiry / response / correction: - Timeout / retry / duplicate / outage / recovery / reconciliation: - Identity / authorization / audit / incident / data terms: - Total implementation, usage, support, upgrade, audit, and exit cost:
1. Prior authorization API vendor checklist
| Decision | Vendor must disclose | Buyer evidence |
|---|---|---|
| Scope | Payers, products, services, geographies, environments, dates, exclusions, dependencies, and live volume | Payer-validated matrix separated from roadmap |
| Standards | FHIR release, US Core, SMART, CDS Hooks, CRD, DTR, PAS, X12 role, terminology, and versions | Conformance plus dated implementation statement |
| Workflow | Discovery, questionnaire, source retrieval, human review, submission, inquiry, response, correction, and fallback | End-to-end trace with each system and owner |
| Identity and security | Authentication, authorization, scopes, user and organization identity, tokens, secrets, audit, isolation, and incidents | Architecture, configuration, tests, logs, and responsibility matrix |
| Reliability | Acknowledgment, idempotency, retry, timeout, duplicate, queue, status, downtime, recovery, and reconciliation | Failure-injection and recovery results |
| Commercial | Implementation, interfaces, payer connections, testing, usage, support, upgrades, audit, export, and exit | Complete pricing and enforceable service levels |
2. Make the standards architecture explicit
- Which current CMS-required and recommended standards and guides apply to each payer and workflow
- Which component invokes CDS Hooks, launches SMART, calls payer services, maps resources, and persists the record
- How CRD responses identify authorization, documentation, alternatives, forms, or supporting applications
- How DTR questionnaires and rules are versioned, populated from permissible sources, reviewed, corrected, and passed downstream
- How PAS requests, inquiries, responses, updates, references, and errors map to payer and X12 infrastructure
- How member, coverage, provider, organization, facility, service, diagnosis, and request identities are resolved and corrected
3. Test representative and adversarial API scenarios
- 01
Ordinary request
Discover requirements, retrieve and review evidence, submit, receive acknowledgment and decision, and reconcile without manual re-entry.
- 02
Conflicting source
Expose the gap, preserve provenance, obtain qualified review, correct the request, and prevent an unsupported field from being inferred.
- 03
Payer variation
Run the same service across products with different requirements, endpoints, versions, or fallback channels.
- 04
Ambiguous outcome
Interrupt the response after submission, retry safely, inquire, prevent duplication, recover the receipt, and reconcile state.
- 05
Adverse decision
Capture exact scope, reason, policy context, notice, rights, deadlines, correction, appeal handoff, and schedule effect.
- 06
Security and outage
Revoke credentials, constrain a compromised client, operate downtime capture, restore, replay safely, and reconcile.
4. Put implementation ownership into the contract
| Work | Questions to settle | Artifact |
|---|---|---|
| Configuration | Who maps payers, users, roles, fields, sources, codes, rules, endpoints, and exceptions? | Responsibility matrix and accepted baseline |
| Testing | Who supplies sandboxes, synthetic data, conformance tools, payer cases, defects, regression, and sign-off? | Test plan, evidence package, and risk approval |
| Change | Who monitors CMS, HL7, X12, payer, EHR, terminology, security, and product changes? | Notice, compatibility, retest, and rollback policy |
| Operations | Who monitors transactions, failures, queues, availability, responses, and support escalation? | Service levels, incident duties, and recovery objectives |
| Exit | How are connections, credentials, records, queues, evidence, and configuration transferred or retired? | Export, deletion proof, and continuity plan |
5. Gate production readiness with evidence
- Validated payer, product, service, site, provider, environment, endpoint, and workflow scope
- Signed architecture, data flow, responsibility, privacy, security, Part 2 if applicable, and risk decisions
- Current conformance, test results, deviations, payer confirmations, defect dispositions, and regression evidence
- Trained roles, support paths, monitoring, reconciliation, patient communication, and escalation coverage
- Downtime, fallback, duplicate, recovery, replay, correction, audit, incident, rollback, and exit tests
- Baseline and production measures for eligible use, technical success, usable response, staff work, access, and cost
Common questions
Answers before you build.
What should a prior authorization API vendor support?+
Support should be described for the exact payer and workflow using named standards and versions. Buyers commonly need requirement discovery, documentation, submission and inquiry, responses, identity, security, error recovery, human review, reconciliation, fallback, monitoring, and change management.
Are CRD, DTR, and PAS the same API?+
No. They are related Da Vinci implementation guides addressing coverage-requirement discovery, documentation templates and rules, and prior-authorization submission and response. A production workflow may use them together with other standards.
Does FHIR replace X12 for every prior authorization?+
Do not assume so. CMS has described enforcement discretion for certain all-FHIR implementations under CMS-0057-F, while PAS addresses X12 mapping. Confirm the current rule, payer architecture, transaction obligations, and implementation.
How should a vendor pilot be scoped?+
Choose a bounded payer-service cohort, define eligibility, baseline, must-pass scenarios and controls, test failures, retain a staffed fallback, reconcile every case, and expand only after quality, reliability, access, and cost gates hold.
Practical closeout
Use this operator checklist.
- Validate regulatory and payer scope before comparing vendor coverage claims.
- Record every standard, implementation guide, profile, extension, value set, and version.
- Test CRD, DTR, and PAS as an operational journey, not isolated endpoints.
- Assign identity, mapping, clinical review, reconciliation, support, fallback, and change ownership contractually.
- Require conformance evidence and representative production scenarios before expansion.
Continue through the cluster
Verified customer case studies are added only with customer permission and supporting evidence; none is implied by these operational examples.
Sources & methodology
Trace the operational claims.
Marsa Health Editorial reviewed the primary and research sources below on July 22, 2026. We translate them into workflow controls, distinguish proposals from final rules, and flag where plan, program, state, contract, or clinical requirements vary.
- 01CMS Interoperability and Prior Authorization Final Rule CMS-0057-F Centers for Medicare & Medicaid ServicesCurrent implementation dates, decision timeframes, denial-reason requirements, metrics, and API provisions for impacted payers.Accessed or rechecked July 22, 2026
- 02Electronic Prior Authorization Centers for Medicare & Medicaid ServicesCurrent CMS provider-readiness guidance for 2027 electronic prior authorization, EHR questions, FHIR testing, and workflow preparation.Accessed or rechecked July 22, 2026
- 03Prior Authorization API Workflow Centers for Medicare & Medicaid ServicesCMS workflow overview for coverage requirements discovery, documentation templates and rules, and prior authorization support APIs.Accessed or rechecked July 22, 2026
- 04Provider prior authorization API: prior authorization support ASTP/Office of the National Coordinator for Health ITCurrent health IT certification test method and standards references for provider prior authorization API capabilities.Accessed or rechecked July 22, 2026
- 05Da Vinci Coverage Requirements Discovery FHIR Implementation Guide Health Level Seven InternationalOfficial HL7 implementation guide for discovering payer-specific coverage and documentation requirements within a provider workflow. Implementers must verify the current published version and CMS-required standards.Accessed or rechecked July 22, 2026
- 06Da Vinci Documentation Templates and Rules FHIR Implementation Guide Health Level Seven InternationalOfficial HL7 implementation guide for expressing, retrieving, populating, and reviewing payer documentation requirements using FHIR questionnaires and related rules.Accessed or rechecked July 22, 2026
- 07Da Vinci Prior Authorization Support FHIR Implementation Guide Health Level Seven InternationalCurrent official HL7 guide for FHIR prior-authorization submission, inquiry, and response workflows, including mappings and implementation considerations related to X12 transactions.Accessed or rechecked July 22, 2026
- 08Summary of the HIPAA Security Rule U.S. Department of Health and Human ServicesCurrent Security Rule overview covering administrative, physical, and technical safeguards, access controls, risk analysis, and review of ePHI activity.Accessed or rechecked July 22, 2026
Organizational author. Editorial review covers source accuracy, search intent, workflow boundaries, and human-oversight requirements. This material is educational and does not provide clinical, legal, coding, or coverage advice.
No named clinical or legal expert reviewer is attributed to this version. Marsa Health does not invent reviewer credentials.
Read our editorial methodRevision history
What changed and when
July 22, 2026
Initial publication, source review, and operational editing.