Northstar Payer Determination

Northstar Payer-Operations Determination

You are handed a Northstar Health Plan payer-operations work item. Review the relevant records in the shared read-only environment and return exactly one JSON object that conforms to the task's answer_template.json, ending in the standard basis_audit block.

Inputs (under the task's input/ directory — read all three first)

• prompt.txt — the narrative request: target ID, requester role, reporting date/period, and what the deliverable must include.
• payloads/task_context.json — machine-readable parameters. The target business ID key varies by archetype (target_business_id, business_id, target.claim_id, target.case_id, work_item.case_id, etc.). Also carries requester_role, reporting_date/reporting_period, the environment access block, and any task-specific parameters (queue row IDs, thresholds, total-cost definitions, appeal windows). Honor these verbatim.
• payloads/answer_template.json — the authoritative output contract: required top-level keys, per-field types/enums, list ordering rules, numeric precision, additional_fields_allowed, and the basis_audit schema. It is the source of truth for the shape of your answer.

Environment access — network only

Reach the environment exactly as described in environment_access.md (details in references/environment_and_data_model.md). Never open, read, grep, or otherwise inspect environment source files, generated data files, SQLite database files, manifests, or setup scripts — use the HTTP endpoints only.

• Base URL: from environment_access.md.
• GET /api/... business endpoints are open (no auth): /portal, /api/tables, /api/cases, /api/cases/{case_id}, /api/policies, /api/policies/{policy_id}, /api/documents/{document_id}, /api/rate-schedules, /api/appeals.
• POST /sql/query requires header Authorization: Bearer pa-review-token-014 and JSON body {"sql": "<SQL>"} (SQLite dialect). Response shape: {"columns":[...], "rows":[...], "row_count":N, "max_rows":500, "limited":bool}. Check limited — if true, narrow your query (add WHERE/LIMIT) until it is false so no rows are silently dropped.

Use GET /api/tables to confirm the current schema, then use SQL for joins and targeted retrieval and the GET /api/... endpoints for single-record lookups.

Procedure

1. Read the three inputs. Capture the target business ID, role, reporting date/period, and any task parameters. Note the exact required keys, enums, and ordering rules from the template.
2. Classify the archetype. From role + service domain + requested output, map to one of the archetypes in references/task_archetypes.md. This fixes the source_precedence rule and the business logic to apply.
3. Gather evidence (network only). Pull the target record and every related record the archetype needs. Prefer the current/effective record and identify any stale/legacy alternative that must be rejected or excluded. Apply date, plan_type, modifier, and version filtering to pick the controlling record.
4. Compute the determination per the archetype logic and the template's enums. Apply task_context parameters verbatim — e.g., use only the listed queue row IDs; the given threshold; the given total-cost definition; the given appeal window.
5. Build the basis_audit per references/basis_audit.md: pick source_precedence for the archetype; populate controlling_record_ids, exception_record_ids, and precedence_record_order using the prescribed orderings.
6. Emit one JSON object conforming to answer_template.json. No markdown, no comments, no prose outside the JSON. Follow references/output_conventions.md (list orderings, currency to cents, null for absent modifiers, date/ratio formats, integer units).
7. Self-check against the template: every required top-level key present; every enum value in the allowed set; every list in the specified order; additional_fields_allowed respected; numeric precision correct; no extra keys when disallowed.

References

• references/environment_and_data_model.md — endpoint behavior, SQL wire format, and the full table/column data model.
• references/task_archetypes.md — the task archetypes, what each reviews, key outputs, and the source_precedence mapping.
• references/basis_audit.md — the basis_audit structure and ordering rules (identical across all templates) plus the source_precedence decision table.
• references/output_conventions.md — JSON-only output, list orderings, and numeric/date/null conventions.