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kert aa013d1c28
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feat: OPPS file download + ingestion — 6 years of addenda into DuckDB (refs #264)
Download: CMS OPPS addenda ZIPs (CY2021-2026) from cms.gov/files/zip/
Ingest: parse Addendum A (APC weights) + Addendum B (HCPCS-APC crosswalk)
with header detection for CMS preamble rows across format drift.

Tables loaded:
- opps.apc_weight: 5,507 rows (804→1,041 APCs, 6 years)
- opps.addendum_b: 108,168 rows (17K→19K HCPCS codes per year)
- opps.skin_sub_addendum_b: 1,549 rows — skin sub SI history

Key finding — CY2026 reclassification visible in status indicators:
- 2021-2025: SI=N (packaged, 145→245 codes), SI=B (bundled, 52)
- 2026: SI=S1 (new separately payable supply, 272 codes) — the flat rate
  SI=N drops to 31, SI=D (deleted) = 10 codes
2026-03-25 22:40:19 -04:00
..