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Fonteum · Risk Signals

Deterministic anomaly detection on the federal provider graph

The Fonteum graph defines four deterministic risk rules. One is active today — OIG exclusion screening against the OIG LEIE file. Two more are defined and dormant: anomalous payment patterns and NPPES-vs-PECOS specialty mismatches activate once their source data is keyed into the graph. Claim inactivity is planned, pending a claims dataset. Each signal cites the exact source row — not an ML confidence score, a primary-source fact.

OIG ExclusionHigh PaymentSpecialty MismatchNo Recent Claims
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How it works

1
Deterministic rules, not ML

Each rule is a pure function of federal data rows. Rule a checks the OIG LEIE exclusion file (active today). Rule b compares Open Payments totals against specialty-level percentiles. Rule c cross-joins NPPES and PECOS taxonomy columns. Rule e checks claim activity windows. No model, no threshold tuning.

2
Source-cited evidence

Every signal carries a structured evidence JSON that cites the specific source row(s) that triggered it: LEIE row ID, Open Payments total, or PECOS specialty. You can independently verify any signal by looking up the cited record directly in the federal source.

3
Deterministic re-runs

Signals are recomputed nightly via an Inngest cron. Each recomputation is idempotent — the same source data always produces the same signal. If the source data changes (e.g. an exclusion is removed), the signal resolves automatically and resolved_at is set.

Live signal feed

Most recent signals across the provider graph, ordered by severity then recency.

OIG Exclusion13d ago
NPI: 1922348218
LEIE row ID7
Type1128a1
Exclusion date2018-04-19
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1942476080
LEIE row ID27
Type1128b8
Exclusion date2017-05-18
DescriptionDME COMPANY
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1275600959
LEIE row ID31
Type1128a1
Exclusion date2013-03-20
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1891731758
LEIE row ID34
Type1128b8
Exclusion date2017-05-18
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1265830335
LEIE row ID44
Type1128a1
Exclusion date2022-08-18
DescriptionDME COMPANY
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1851631543
LEIE row ID67
Type1128b7
Exclusion date2019-03-26
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1902198435
LEIE row ID68
Type1128a1
Exclusion date2016-01-20
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1073916631
LEIE row ID69
Type1128b7
Exclusion date2021-08-16
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1437510278
LEIE row ID82
Type1128a1
Exclusion date2023-04-20
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1073682936
LEIE row ID84
Type1128b7
Exclusion date2015-04-09
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1902166028
LEIE row ID89
Type1128b8
Exclusion date2017-05-18
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List
OIG Exclusion13d ago
NPI: 1972902351
LEIE row ID3
Type1128b8
Exclusion date2022-03-20
DescriptionOTHER BUSINESS
Dataset release2026-05-08
Source: OIG LEIE Exclusions List

The signal types

OIG ExclusionActive

OIG Exclusion

A provider NPI matched a record in the OIG LEIE monthly exclusion file. Excluded providers are barred from receiving payments from federal health programs. The signal cites the LEIE row ID, exclusion type, and exclusion date.

Active: Live today against the OIG LEIE exclusion file.

Source: OIG LEIE — oig.hhs.gov/exclusions
OIG Exclusion13d ago
NPI: 1003000100
LEIE row ID12345
TypePERMEXC
Exclusion date2024-01-15
DescriptionFraud
Dataset release2026-05-01
Source: OIG LEIE Exclusions List
High PaymentDormant

High Payment

A provider's total CMS Open Payments amount for a given year exceeds the 95th percentile for their specialty. Elevated payment totals may indicate financial relationships with device or pharmaceutical manufacturers worth scrutiny in network contracting.

Dormant: Defined and ready; activates when CMS Open Payments is keyed to NPI in the graph.

Source: CMS Open Payments — openpaymentsdata.cms.gov

Add risk signal coverage to your provider data pipeline

Risk signals are available via the provider NPI API at /api/risk/[npi]. Each response carries full 14-tuple provenance linking the signal to its source row.

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High Payment15d ago
NPI: 1003000126
Total payments$245,000
p95 threshold$100,000
SpecialtyOrthopedic Surgery
Source: CMS Open Payments
Specialty MismatchDormant

Specialty Mismatch

The primary taxonomy code in NPPES does not match the specialty registered in CMS PECOS. NPPES is self-reported; PECOS is validated at enrollment. A mismatch can indicate a stale NPPES record or an administrative discrepancy that may affect network directory accuracy.

Dormant: Defined and ready; activates when a PECOS taxonomy/specialty column lands to compare against NPPES.

Source: NPPES vs. CMS PECOS cross-check
Specialty Mismatch16d ago
NPI: 1003000134
NPPES taxonomy207Q00000X — Family Medicine
PECOS specialtyInternal Medicine
Source: NPPES vs. PECOS cross-check
No Recent ClaimsPlanned

No Recent Claims

A provider with an active NPI and enrollment status has no claims activity in the most recent 12-month window. This signal will activate once the claims dataset is integrated. It is currently a stub rule that will fire against CMS Part B claims data.

Planned: Planned; fires once a CMS Part B claims dataset is integrated.

Source: CMS Part B Claims (pending integration)