# Hospital MRF version ledger

`dim_mrf_version` · Provenance · status live

Per-MRF-fetch version tracking for the hospital substrate. fact_hospital_ chargemaster rows reference it via mrf_version_id. Detects ping-only updates.

**Grain.** One row per (hospital_ccn, content_sha256) observed HPT file.

Query it: `query_substrate` with `SELECT ... FROM dim_mrf_version WHERE ... LIMIT 100`; read `describe_data_source("dim_mrf_version")` first.