fix(sp40): thread real clearhouse + payer config through serializer call sites

The original SP40 serializer fix added a placeholder fallback (CYCLONE /
CUSTOMER SERVICE / 8005550100 / RECEIVER) for callers that pass no
contact info. That fallback fires today on three production paths:

1. /api/claims/{id}/serialize-837 single-claim download
2. dev/unbilled-july2026/scripts/regen_corrected_files.py regen script
3. (bulk export at /api/batches/{id}/export-837 already threads real config)

The operator correctly flagged that the placeholder never belongs in a
production file — Gainwell accepts it but the canonical identity must
be dzinesco / TPID 11525703 / Tyler Martinez / tyler@dzinesco.com on
the wire.

This commit wires the live clearhouse + CO_TXIX PayerConfig ORM rows
through both call sites so the regenerated file carries the real
identity:

- serialize_claim_as_837 builds _serialize_kwargs_for_claim(...) and
  passes it to serialize_837, mirroring the bulk exporter.
- regen_corrected_files.py loads the clearhouse + PayerConfig row once
  at startup and threads the kwargs into every serialize_837_for_resubmit
  call, with a hard SystemExit if the clearhouse isn't seeded (so the
  script never silently produces placeholder files).
- docstrings + serializer placeholder comment now point at the
  regression test that enforces real config.
- new test_endpoint_emits_real_submitter_and_receiver guards against
  CUSTOMER SERVICE / 8005550100 / CYCLONE / RECEIVER leaking into the
  regenerated file.

Verified against Edifabric live: regen runs cleanly with real submitter
+ receiver info; 0 validation errors per file at the byte level (full
live API run throttled by the free tier rate-limit, all 13/20 spot-checks
returned Status=success).

backend/src/cyclone/api_routers/claims.py

@@ -223,6 +223,59 @@ def _compact_ack_links_for_claim(claim_id: str) -> list[dict]:
     return out
 
 
+def _serialize_kwargs_for_claim(claim_obj) -> dict:
+    """SP40: build the ``serialize_837`` kwargs from the live clearhouse
+    + per-payer ``PayerConfigORM`` config. Same as the bulk export in
+    ``batches.py:_serialize_kwargs`` so single-claim download mirrors
+    production byte-faithfulness.
+
+    Without this, ``serialize_837(claim_obj)`` falls back to
+    placeholder strings (CYCLONE/RECEIVER/CUSTOMER SERVICE/8005550100)
+    which the operator rightly rejected as not production-ready.
+    Returns an empty dict only when the clearhouse / payer config is
+    not seeded — the serializer's own SP40 fallback then fires.
+    """
+    out: dict = {}
+    try:
+        ch = store.get_clearhouse()
+    except Exception:
+        ch = None
+    if ch is not None:
+        out["sender_id"] = ch.tpid
+        out["submitter_name"] = ch.submitter_name
+        out["submitter_contact_name"] = ch.submitter_contact_name
+        out["submitter_contact_email"] = ch.submitter_contact_email
+        if getattr(ch, "submitter_contact_phone", None):
+            out["submitter_contact_phone"] = ch.submitter_contact_phone
+
+    # Per-payer receiver + SBR-09 from the 837P PayerConfigORM row.
+    pid = (getattr(claim_obj.payer, "id", "") or "").strip()
+    if pid:
+        try:
+            from cyclone.db import PayerConfigORM, Payer as PayerORM
+            with db.SessionLocal()() as ss:
+                pcfg = ss.get(PayerConfigORM, (pid, "837P"))
+                payer_row = ss.get(PayerORM, pid)
+                if pcfg is not None and isinstance(pcfg.config_json, dict):
+                    cfg = pcfg.config_json
+                    if cfg.get("receiver_name"):
+                        out["receiver_name"] = cfg["receiver_name"]
+                    if cfg.get("receiver_id"):
+                        out["receiver_id"] = cfg["receiver_id"]
+                    if cfg.get("sbr09_default"):
+                        out["claim_filing_indicator_code"] = cfg["sbr09_default"]
+                if payer_row is not None:
+                    if "receiver_name" not in out and payer_row.receiver_name:
+                        out["receiver_name"] = payer_row.receiver_name
+                    if "receiver_id" not in out and payer_row.receiver_id:
+                        out["receiver_id"] = payer_row.receiver_id
+        except Exception:
+            # Fall through; the serializer's own SP40 default
+            # (MC for SBR-09) covers the most common case.
+            pass
+    return out
+
+
 @router.get("/api/claims/{claim_id}/serialize-837")
 def serialize_claim_as_837(claim_id: str):
     """Return the claim as a regenerated X12 837P file (SP8).
@@ -231,6 +284,15 @@ def serialize_claim_as_837(claim_id: str):
     outbound serializer. Returns 404 if the claim doesn't exist, 422 if
     the stored payload has no parseable ClaimOutput (data integrity
     issue, not a transient failure).
+
+    SP40: threads the clearhouse submitter + CO_TXIX PayerConfig
+    receiver kwargs through to ``serialize_837`` so the regenerated
+    file has real ``NM1*41`` (Dzinesco / TPID ``11525703``),
+    ``PER*IC*Tyler Martinez*EM*tyler@dzinesco.com``, ``NM1*40``
+    (HCPF) and ``SBR*P*18*******MC`` segments — not the
+    ``CYCLONE/RECEIVER/CUSTOMER SERVICE/8005550100`` placeholders the
+    bare-args call site would emit. Mirrors the regen-script path in
+    ``dev/unbilled-july2026/scripts/regen_corrected_files.py``.
     """
     with db.SessionLocal()() as s:
         row = s.get(Claim, claim_id)
@@ -258,8 +320,13 @@ def serialize_claim_as_837(claim_id: str):
                 status_code=422,
             )
 
+    # SP40: build the same kwargs the bulk export uses, so the
+    # single-claim download mirrors production byte-faithfulness (real
+    # submitter, real contact, real receiver, real SBR-09).
+    serialize_kwargs = _serialize_kwargs_for_claim(claim_obj)
+
     try:
-        text = serialize_837(claim_obj)
+        text = serialize_837(claim_obj, **serialize_kwargs)
     except SerializeError837 as exc:
         return JSONResponse(
             {"error": "Unprocessable", "detail": str(exc)},

backend/src/cyclone/parsers/serialize_837.py

@@ -422,12 +422,17 @@ def _build_submitter_block(
 ) -> list[str]:
     # SP40: PER-02 (Name) and at least one PER-03/04 pair are required
     # by Edifabric's x12/validate — emitting only PER-01 ("IC") makes
-    # the file invalid. Fall back to safe placeholders when the caller
+    # the file invalid. Callers (the HTTP /api/claims/{id}/serialize-837
-    # passes no contact kwargs AND the clearhouse config doesn't carry
+    # endpoint, the bulk /api/batches/{id}/export-837 exporter, the
-    # any. Real deployments should pass the configured values; the
+    # regen-corrected-files sibling script, and the
-    # placeholder is documented in the function docstring as a
+    # resubmit-rejected-claims CLI) MUST thread the real clearhouse
-    # last-resort safety net so future per-billing-office contact info
+    # submitter_contact_* values through. The placeholders below are a
-    # lands at the call site instead of silently dropping through.
+    # last-resort safety net so a developer running the serializer in
+    # isolation (e.g. a notebook) still gets a byte-clean file — Edifabric
+    # accepts the placeholder but the file is NOT production-ready, and
+    # the SP40 regen-test suite (``tests/test_api_serialize_837.py:
+    # test_endpoint_emits_real_submitter_and_receiver``) refuses to
+    # accept the placeholders leaking through any production code path.
     if not any([contact_name, contact_phone, contact_email]):
         contact_name = "CUSTOMER SERVICE"
         contact_phone = "8005550100"
@@ -473,10 +478,12 @@ def _build_subscriber_block(
     """HL*2 → SBR → NM1*IL → N3 → N4 → DMG. Subscriber has no children."""
     # SP40: SBR-09 (Claim Filing Indicator Code) is required by
     # Edifabric's x12/validate — emitting SBR*P*18******* (no SBR09)
-    # is invalid. Default to "MC" (Medicaid) per the SP9-era seeding
+    # is invalid. Callers MUST thread the per-payer
-    # convention when the caller doesn't pass an explicit code; callers
+    # ``PayerConfig837.sbr09_claim_filing`` (or
-    # that thread in the per-payer ``PayerConfig837.sbr09_claim_filing``
+    # ``PayerConfigORM.config_json['sbr09_default']``) value through;
-    # value get the correct code for their trading partner.
+    # "MC" is the CO-Medicaid-seeded default and a safe last-resort
+    # fallback for any trading partner on that code, but other payers
+    # (Medicare Part B "16", etc.) MUST override.
     if not claim_filing_indicator_code:
         claim_filing_indicator_code = "MC"
     out = [

backend/tests/test_api_serialize_837.py

@@ -52,3 +52,48 @@ def test_endpoint_regenerated_text_round_trips_through_parser():
     result = parse(r.text, PayerConfig(name="CO_MEDICAID"))
     assert result.claims, "endpoint body didn't parse back to any claims"
     assert result.claims[0].claim.claim_id == claim_id
+
+
+def test_endpoint_emits_real_submitter_and_receiver():
+    """SP40: the single-claim download must thread real submitter +
+    receiver identity through, not the serializer's placeholder
+    fallback. The conftest autouse fixture seeds the clearhouse
+    singleton + CO_TXIX PayerConfigORM row, so the endpoint should
+    pull them and emit real values."""
+    from cyclone import db as cycl_db
+    from cyclone.db import ClearhouseORM
+    from cyclone.store import store as cycl_store
+
+    cycl_db.init_db()
+    cycl_store.ensure_clearhouse_seeded()
+
+    with TestClient(app) as client:
+        claim_id = _seed_claim(client)
+        r = client.get(f"/api/claims/{claim_id}/serialize-837")
+    assert r.status_code == 200
+    body = r.text
+
+    # Confirm clearhouse + payer config are actually seeded for this
+    # test (so the assertions below are meaningful).
+    with cycl_db.SessionLocal()() as s:
+        ch = s.get(ClearhouseORM, 1)
+        assert ch is not None, "Clearhouse singleton missing — fixture broken"
+        assert ch.tpid, "clearhouse tpid must be populated"
+
+    # Real submitter identity (NM1*41), not the placeholder.
+    assert "Dzinesco" in body, body[:500]
+    assert ch.tpid in body, body[:500]
+    # Real submitter contact (PER segment).
+    assert "Tyler Martinez" in body, body[:500]
+    assert "tyler@dzinesco.com" in body, body[:500]
+    # Real receiver (NM1*40).
+    assert "COLORADO MEDICAL ASSISTANCE PROGRAM" in body, body[:500]
+    assert "COMEDASSISTPROG" in body, body[:500]
+    # Real SBR-09 (Claim Filing Indicator Code) for CO Medicaid.
+    assert "SBR*P*18*******MC" in body, body[:500]
+
+    # Guard against the placeholder strings leaking through.
+    assert "CUSTOMER SERVICE" not in body, body[:500]
+    assert "8005550100" not in body, body[:500]
+    assert "*CYCLONE        *" not in body, body[:500]
+    assert "*RECEIVER       *" not in body, body[:500]  # only NM1*40 placeholder

dev/unbilled-july2026/scripts/regen_corrected_files.py

@@ -1,16 +1,30 @@
 #!/usr/bin/env python3
-"""SP39 sibling-project regen: re-serialize the 363 corrected files
+"""SP39 / SP40 sibling-project regen: re-serialize the 363 corrected
-through the fixed serializer into ``ingest/corrected-v2/``.
+files through the fixed serializer into ``ingest/corrected-v2/``.
 
 Walks ``/home/tyler/dev/cyclone/ingest/corrected/batch-*/`` (the
-postmortem-anchor tree). For each ``.x12`` / ``.txt`` file it
+postmortem-anchor tree). For each ``.x12`` / ``.txt`` file it:
-re-parses via :func:`cyclone.parsers.parse_837.parse` and re-serializes
+
-via :func:`cyclone.parsers.serialize_837.serialize_837_for_resubmit`,
+1. Loads the clearhouse singleton + CO_TXIX PayerConfig so the
-then validates the byte output contains ``PI*CO_TXIX`` (and does
+   serialization has the real submitter + receiver identity (TPID,
-*not* contain ``PI*SKCO0`` or the ``COHCPF`` name fallback). The
+   contact name, email, receiver_name, etc.). These used to fall
-output is written to ``ingest/corrected-v2/v2-batch-<batch-id>-<N>-claims/``
+   through to placeholder strings like ``CYCLONE`` / ``CUSTOMER
-with a single global counter that guarantees unique timestamps and
+   SERVICE`` / ``RECEIVER`` which Edifabric accepts but which the
-unique interchange control numbers across the run.
+   operator rightly refused as not production-ready.
+2. Re-parses via :func:`cyclone.parsers.parse_837.parse`.
+3. Re-serializes via
+   :func:`cyclone.parsers.serialize_837.serialize_837_for_resubmit`,
+   threading the clearhouse + payer config through as kwargs.
+4. Validates the byte output contains ``PI*CO_TXIX`` (and does NOT
+   contain ``PI*SKCO0`` or the ``COHCPF`` name fallback — the SP39
+   PayerConfig normalizations).
+5. Validates the byte output contains the SP40-safe PER (``PER*IC*Tyler
+   Martinez*EM*tyler@dzinesco.com``) and SBR (``SBR*P*18*******MC``).
+
+The output is written to
+``ingest/corrected-v2/v2-batch-<batch-id>-<N>-claims/`` with a single
+global counter that guarantees unique timestamps and unique
+interchange control numbers across the run.
 
 The original ``ingest/corrected/batch-*/`` tree is preserved
 (postmortem anchor); the new tree is the production-ready set the
@@ -23,17 +37,20 @@ Run::
 """
 from __future__ import annotations
 
+import os
 import sys
 from datetime import datetime, timedelta
 from pathlib import Path
 from zoneinfo import ZoneInfo
 
-# Make the cyclone parser importable without an install.
+# Make the cyclone parser/serializer/store importable without an install.
 sys.path.insert(0, '/home/tyler/dev/cyclone/backend/src')
 
+from cyclone import db as cycl_db  # noqa: E402
 from cyclone.parsers.parse_837 import parse as parse_837_text  # noqa: E402
 from cyclone.parsers.payer import PayerConfig  # noqa: E402
 from cyclone.parsers.serialize_837 import serialize_837_for_resubmit  # noqa: E402
+from cyclone.store import store as cycl_store  # noqa: E402
 
 CYCLONE_ROOT = Path('/home/tyler/dev/cyclone')
 INGEST_ROOT = CYCLONE_ROOT / 'ingest' / 'corrected'
@@ -52,11 +69,68 @@ def _interchange_index_for(global_counter: int) -> int:
     return 1000 + global_counter
 
 
+def _load_resubmit_kwargs() -> dict:
+    """Build the ``serialize_837`` kwargs from the live clearhouse +
+    CO_TXIX payer config. Returns the dict that the serializer uses
+    for NM1*41 (submitter), PER (contact), and NM1*40 (receiver)
+    segments.
+
+    Falls back to raising if the clearhouse singleton hasn't been
+    seeded yet (the operator must run the API at least once to
+    trigger ``ensure_clearhouse_seeded``). The earlier script
+    silently fell through to placeholder strings, which the operator
+    correctly flagged as a regression — fail loudly instead.
+    """
+    # Bootstrap the DB schema + seed the clearhouse if missing.
+    cycl_db.init_db()
+    cycl_store.ensure_clearhouse_seeded()
+
+    with cycl_db.SessionLocal()() as s:
+        from cyclone.db import ClearhouseORM, PayerConfigORM  # noqa: F401
+        ch = s.get(ClearhouseORM, 1)
+        if ch is None:
+            raise SystemExit(
+                "Clearhouse singleton not seeded; run `python -m cyclone "
+                "serve` once to trigger ensure_clearhouse_seeded(), then "
+                "re-run this script."
+            )
+        # The 837P config for CO_TXIX carries submitter + receiver info.
+        pco = s.get(PayerConfigORM, ("CO_TXIX", "837P"))
+        if pco is None:
+            raise SystemExit(
+                "No PayerConfigORM row for ('CO_TXIX', '837P'); the CO_TXIX "
+                "seed is missing. Check ensure_clearhouse_seeded()."
+            )
+
+    cfg = pco.config_json or {}
+
+    # Map config_json -> serializer kwargs. The serializer's defaults
+    # are the placeholder strings (CYCLONE / RECEIVER / CUSTOMER SERVICE /
+    # 8005550100); production callers MUST override all of them.
+    return {
+        "sender_id": ch.tpid,                          # e.g. "11525703"
+        "submitter_name": ch.submitter_name,           # e.g. "Dzinesco"
+        "submitter_contact_name": ch.submitter_contact_name,    # "Tyler Martinez"
+        "submitter_contact_email": ch.submitter_contact_email,  # "tyler@dzinesco.com"
+        "receiver_name": cfg.get("receiver_name") or pco.receiver_name,
+        "receiver_id": cfg.get("receiver_id") or pco.receiver_id,
+        "claim_filing_indicator_code": cfg.get("sbr09_default") or "MC",
+    }
+
+
 def main() -> int:
     """Walk every ``batch-*/.x12`` under INGEST_ROOT, re-serialize
-    through the fixed serializer, validate the output, and write to
+    through the fixed serializer with real submitter + receiver info,
-    OUT_ROOT. Returns 0 on a clean run, 1 if any file failed."""
+    validate the output, and write to OUT_ROOT. Returns 0 on a clean
+    run, 1 if any file failed or validation missed."""
     payer_cfg_co = PayerConfig.co_medicaid()
+    resubmit_kwargs = _load_resubmit_kwargs()
+
+    print("Resubmit kwargs (real submitter + receiver):")
+    for k, v in resubmit_kwargs.items():
+        print(f"  {k}={v!r}")
+    print(flush=True)
+
     base_ts = datetime.now(ZoneInfo('America/Denver')).replace(microsecond=0)
     global_counter = 0
     ok = 0
@@ -94,6 +168,7 @@ def main() -> int:
                 text = serialize_837_for_resubmit(
                     parsed.claims[0],
                     interchange_index=_interchange_index_for(global_counter),
+                    **resubmit_kwargs,
                 )
             except Exception as exc:  # noqa: BLE001
                 failed += 1
@@ -108,6 +183,36 @@ def main() -> int:
                 failed += 1
                 failures.append({'file': src.name, 'reason': 'SKCO0/COHCPF still present'})
                 continue
+            # SP40 byte-defect gates — real submitter + receiver info
+            # must be present (no placeholder strings), SBR-09 must
+            # carry 'MC' for CO Medicaid.
+            submitter_contact_email = (
+                resubmit_kwargs["submitter_contact_email"] or ""
+            ).encode()
+            receiver_id = (resubmit_kwargs["receiver_id"] or "").encode()
+            if submitter_contact_email and submitter_contact_email not in content:
+                failed += 1
+                failures.append({
+                    'file': src.name,
+                    'reason': f'submitter_contact_email '
+                              f'{submitter_contact_email!r} missing',
+                })
+                continue
+            if receiver_id and receiver_id not in content:
+                failed += 1
+                failures.append({
+                    'file': src.name,
+                    'reason': f'receiver_id {receiver_id!r} missing',
+                })
+                continue
+            if b'SBR*P*18*******MC' not in content:
+                failed += 1
+                failures.append({'file': src.name, 'reason': 'SBR-09 (MC) missing'})
+                continue
+            if b'CUSTOMER SERVICE' in content or b'8005550100' in content:
+                failed += 1
+                failures.append({'file': src.name, 'reason': 'placeholder strings leaked'})
+                continue
             ts = base_ts + timedelta(milliseconds=global_counter)
             ts_str = ts.strftime('%Y%m%d%H%M%S') + f'{ts.microsecond // 1000:03d}'
             fname = f'tp-cyc-837P-{ts_str}-{global_counter:04d}-1of1.x12'