Built on the authoritative federal record
The primary sources, named on every page.
These are the federal agencies whose public datasets Fonteum ingests and attributes — the issuing authorities, not customers or partners. Every figure on the site links back to one of them.
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Reproducible by design
Every figure traces to its federal source.
14-tuple provenance
Every rendered fact ties to a source URL, dataset ID, snapshot date, row key, and SHA-256 — the full chain-of-custody record.
Reproducible SQL
Each study ships the exact query behind its figures, run against the cited federal snapshot. Re-run it yourself.
Daily reconciliation
Published counts are reconciled against the upstream federal datasets on a daily cadence, with drift logged.
Named medical review
Reviewed by Jennifer Montecillo, MD, medical reviewer. Non-practicing medical reviewer.
Two doors
Use the free API and open data
Query providers, facilities, sanctions, and quality scores — each field carrying its federal source. Self-serve, no call to start.
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The substrate, by the numbers
HANOVER ENDOSCOPY is a Medicare-certified ambulatory surgical center in WHIPPANY, NJ (CCN 31C0001201). NPI 1477584621 links this facility deterministically to NPPES and other federal datasets. Quality data is from reporting year 2024. Fonteum publishes CMS Care Compare ASC quality measures for this facility, each sourced directly from the CMS Provider Data Catalog (data.cms.gov/provider-data/dataset/4jcv-atw7).
Fonteum is a US healthcare provenance registry that publishes signed, chain-of-custody-attested research and data pages on Medicare, Medicaid, and federal regulator datasets, drawing from 44 federal source families across CMS, OIG, HRSA, AHRQ, and HHS.
Data last updated: 2026-05-07 · Source: CMS Care Compare Ambulatory Surgical Center (4jcv-atw7) · View on Medicare.gov
Fonteum publishes CMS Care Compare ASC quality measures for HANOVER ENDOSCOPY, each sourced directly from the CMS Provider Data Catalog (dataset 4jcv-atw7).
Fonteum indexes quality data from 44 federal source families, including all six CMS Care Compare facility programs. Each CCN is keyed to its primary CMS dataset — every field traced to a source row and reporting period.
CMS Care Compare · 6 facility types · data.cms.gov · US Government Work
HANOVER ENDOSCOPY (CCN 31C0001201) is identified across CMS Care Compare Ambulatory Surgical Center (4jcv-atw7) published on data.cms.gov. Every field on this page is chained to its source dataset and row.
Each field on this page is sourced from the CMS Care Compare Ambulatory Surgical Center (4jcv-atw7) published on data.cms.gov — a US Government Work. Fonteum re-publishes each value with a provenance record identifying the federal source, release date, and redistribution basis.
Read the full Fonteum provenance methodology or browse the 44 federal source families behind every page.
HANOVER ENDOSCOPY is a Medicare-certified ambulatory surgical center identified by CMS Certification Number 31C0001201. Data sourced from the CMS Care Compare Ambulatory Surgical Center (4jcv-atw7) (data.cms.gov), a US Government Work. Methodology · Report an error · Medicare.gov